GEOLOGICAL INVESTIGATION OF ADELAIDE RIVER GORGE ...
Transcript of GEOLOGICAL INVESTIGATION OF ADELAIDE RIVER GORGE ...
COMMONWEALTH OF AUSTRALIA
DEPARTMENT OF NATIONAL DEVELOPMENT
BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS
RECORD No. 1967/120
5C 180 2
GEOLOGICAL INVESTIGATIONOF ADELAIDE RIVERGORGE DAMSITE No.1
NORTHERN TERRITORY, 1966
by
J.O. BRA YBROOKE
The information contained in this report has been obtained bythe Department of National Development as part of the policyof the Commonwealth Government to assist in the explorationand development of mineral resources. It may not be publishedin any form or used in a company prospectus or statement withoutthe permission in writing of the Director, Bureau of MineralResources, Geology and Geophysics:
501602
RECORD No. 1967/120
GEOLOGICAL INVESTIGATION441r;^
OF ADELAIDE RIVERGORGE DAMSITE No.1
NORTHERN TERRITORY, 1966
by
J.C. BRAYBROOKE
The information contained in this report has been obtained bythe Department of National Development as part of the policyof the Commonwealth Government to assist in the explorationand development of mineral resources. It may not be publishedin any form or use in a company prospectus or statement withoutthe permission in writing of the Director, Bureau of MineralResources, Geology and Geophysics.
:A
GEOLOGICAL INVESTIGATION OF ADELAIDE RIVER GORGE DAM SITE NO. 1
NORTHERN TERRITORY 19 66
by
J.C. Braybrooke
Record 1967/120
CONTENTS
SUMMARY
INTRODUCTION
Page
LOCATION AND ACCESS 1PREVIOUS WORK 1PRESENT INVESTIGATIONS 2
Surveying 2Geological mapping 2Costeaning 2Drilling 3
PHYSIOGRAPHY^' 3
REGIONAL GEOLOGY 4RESERVOIR AREA 5
GENERAL 5POTENTIAL ,LEAKAGE ZONES 5
Tolmer Group 6Adelaide River Fault 6Southern saddle 7Northern saddle 7
DAM SITE GEOLOGY 8LITHOLOGY 8ALLUVIUM 9STRUCTURE 9
Folding 9Faulting 10Jointing 10
WEATHERING 11
The information contained in this report has been obtained by theDepartment of National Development, as part of the policy of the Common-wealth Government, to assist in the exploration and development of mineralresources. It may not be published in any form or used in a companyprospectus without the permission in writing of the Director, Bureau ofMineral Resources, Geology and Geophysics.
Page
ENGINEERING GEOLOGY^ 13
FOUNDATIONS^ 13
Left bank^ 13River bed^ 14Right bank^ 14
DESIGN CONSIDERATIONS^ 16SPILLWAY^ 17CONSTRUCTION MATERIALS^ 17
ROCK-FILL^ 17
Noltenius meta-greywacke^ 17Geological Succession and Structure^17Suitability for Rock-fill^18
Meta-greywacke^ 18Phyllitic Interbeds^ 18Jointing^ 18Bulk Properties^ 1
quantities of Rock-fill^ 19Depot Creek Sandstone^ 20
IMPERVIOUS MATERIAL^ 20SAND^ 21AGGREGATE^ 21
CONCLUSIONS^ 21RECOMMENDATIONS^ 22REFERENCES^ 24
APPENDICES
1^Definitions of semi-quantitative descriptive terms^252^Recommended drilling and costeaning specifications
for quarry site in meta-greywacke^ 26
3^Geological logs of diamond drill holes at Site 14^Geological logs of costeans on right bank of Site 1
TABLES
1^
Classification of degrees of weathering^12
2^
Depths of alluvium in drill holes ARG 39 4, and 7^
143^
Likely volumes and properties of rock-type divisionswithin quarry in meta-greywacke^ 19
ii
FIGURES
1^Generalised stratigraphic section through damsiteand environs
2^Section showing weathering along proposed axis atdamsite No. 1 (1 inch : 100 feet)
3^Geological and structural section along proposedaxis at damsite No. 1 (1 inch : 100 feet)
PLATES
1^Locality map and geological sketch map of storageand catchment area for damsite No. 1 (1:50,000)
2^Adelaide River gorge; combined geological andtopographical map (1 inch : 8 chains)
Damsite No. 1; combined outcrop and topographicalmap '(1 inch : 200 feet)
4^Geological section through quarry, parallel to foldaxis (1 inch : 200 feet)
5^Geological section through quarry, normal to foldaxis (1 inch : 200 feet)
6^Composite stratigraphic column of quarry site inmeta—gTeywacke (1 inch : 40 feet)
7^Pattern of folding in environs of scheme (stereogram).
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SUM. ARY
An economic evaluation of the Adelaide River drainage basin is beingundertaken by the Northern Territory Administration. Any plan of developmentwould require a dam in the Adelaide River gorge, upstream from Adelaide Rivertownship, to store water and control flooding. Following earlier investiga-tions, No. 4 damsite was selected for detailed feasibility studies.^Thegeological work has been carried out for the Water Resources Branch of theNorthern Territory Administration.
The site is near the head of the Adelaide River, 4 miles south-westof Adelaide River township which is 72 miles south of Darwin. The site wasselected., because of the favourable topography and the high storage capacityprovided by the widening of the valley upstream of the gorge. A 100-foot-high dam at No. 1 site would store about 300,000 acre-feet of water.^Othersites lower in the gorge offer no apparent advantage in storage : volume ofdam required and geological conditions.
The geological investigation was to prove the feasibility of a100-foot-high damp to ascertain the type of dam most suited to the site
•conditions, and to permit an order-of-cost estimate to be made.
Outcrop mapping of parts of the Adelaide River gorge and storagearea was done at a scale of 1 inch : 8 chains. More detailed mapping ofoutcrops and. costeans at the damsite was done at 1 inch : 200 feet and1 inch : 10 feet, respectively; 1450 feet of diamond drilling and1,500feet of costeaning and pitting were also carried out.
Bedrock consists of graded meta-greywacke and phyllite of theLower Proterozoic Finniss River Group. The rocks are moderately tightlyfolded, display low-grade metamorphism (greenschist facies), and are un-conformably overlain by the Upper Proterozoic Tolmer Group. The AdelaideRiver Fault passes 'through the area ; downfaulting part of the Tolmer Groupagainst the Finniss River Group.
Treatment may be necessary to prevent leakage out of the storagearea through the Northern and Southern saddles (see Plate 1). Both consistof phyllite.
The damsite lies within the western limb of an anticline. Materialin the left abutment consists of phyllite thoroughly weathered to depths of40 to 50 feet.^The weathered phyllite has soil-like properties: it willconsolidate when loaded, and will not withstand high stresses. Further,many cleavage planes and joints within the phyllite are filled with siltyclay and are potential failure planes.^At least 45 feet of sandy clayalluvium covers the valley floor. The right abutment consists of moderatelyweathered, graded metagreywacke.^Close to the surface, highly weatheredphyllitic interbeds are potential zones of failure; they strike normal tothe proposed dam axis.
Because of expected differential settlement between abutments, itis concluded that a rock-fill dam with a wide impermeable earth core or anearth-fill dam, would be best suited to the site. A spillway channel couldbe excavated in the meta-greywacke on the right bank.
Adequate quantities of rock-fill are present within the meta-grey-wacke sequence in the ridge forming an extension of the 'left abutment.Sufficient quantities of suitable earth material for either an earth-coredor earth-filled dam are believed to occur in the alluvial flats upstream ofthe damsite.
Recommendations for further investigations are outlined at the endof the report.
INTRODUCTION
The Adelaide River gorge has been suggested as'a suitable site fora dam to provide domestic water for Darwin (Woolnough, 1936) i and for hydro -electric power generation (Rosenthal, 1948 ).
The present investigation is part of an overall examination of thepossible development and control of the Adelaide River system being carriedout by the Water Resources Branch of the Northern Territory Administration(W.R.B.). An essential part of any such development would be a dam inAdelaide River gorge. Five possible sites in the gorgp - have been considered,and the uppermost, (No. 1) 9 selected for afeasibilitY study. The dam wouldbe used for flood control and supply of irrigation water forrice growing onthe "black soil" plains of the Adelaide River basin. It Could also, oralternatively, be a source of water for the Darwin town water supply.
LOCATION AND ACCESS
The site is near the head of the Adelaide River gorge; which extendsfrom 2 to 4 miles south-west of Adelaide River township. The township is onthe Stuart Highway, 72 miles south of Darwin (Plate 1).
Access is by a rough, dry-weather track, part of which was constrUc-ted by Water Resources Branch in mid-1966. It is possible, if the track isdry, to travel to the site in an ordinary vehicle, but after heavy raincreek crossings may be washed out.
PREVIOUS WORK
A brief, preliminary report, based on reconnaissance, was sub-mitted by Woolnough (1936)0 The south-east part of the gorge was suggestedas a possible damsite for the supply of domestic water to Darwin.
Rosenthal (1948)9 produced a report for a proPosed'hydro-electricproject on Adelaide River. The site was at the outlet of the Adelaide Rivergorge, 2 miles from Adelaide River township. The project called for a finalwall height of 170 feet. Rosenthal noted that two average wet seasons wouldbe required to fill the storage area produced by a 100-foot- 7-high wall.
Hays (1961) made a preliminary geological investigation of a nuMberof alternative sites, (sites 2,3, and 4; see Plate 2), in the central partof the Adelaide River gorge.
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PRESENT INVESTIGATIONS
Surveying
Water Resources Branch had contour plans of the entire proposedstorage area and gorge prepared from aerial photographs. These plans areon a scale of 1 inch to 8 chains.^Additional plans for the gorge area areon a scale of 1 inch to 200 fee -b 9 with 5 foot contours. Further, WaterResoUrces Branch surveyors laid out a 400-foot grid using theodolite andsteel tape. The grid includes the area of the proposed damsite and ancil-lary structures. The regional grid is laid out on eastings and northingswhile the dam grid has X and Y co-ordinates; the Y ordinate is 37 degrees westof the regional grid-north.
Geological MaPPirla
In June-July, 1966 9 E.J. Best mapped, in outcrop 'detail, theimmediate damsite area, at a scale of 1 inch to 200 feet; and downstreamof the site, on a scale of 1 inch to 8 chains.^The outcrop positions wereplotted directly onto the contour plans.
The present investigation started in NoveMber,,1966, and continueduntil mid-January, 1967.. preliminary mapping of the storage area wascarried out at A scale' of 1 inch to 8,chains. Further mapping of the dam-site area and the prospective quarry site was done on a scale of 1 inch to .200 feet, again directly onto the contour plans (see Plates ;2 and 3). 7
Costeaning
Costeaning and pitting was carried out before drilling began.Costeans were bulldozed on both sides of the river near the dam axis, andbehind the right bank, close to the proposed spillway site.. Additionalcosteans were excavated across the southern saddle (see Plate 2).^Pittingwas carried out on some of the alluvial flats, upstream of the damsite.
In addition to providing information on the lithOlogy andstructure of the area, the costeans gave an indication of the thicknessof soil and detritus overlying bedrock. Those on the right bank werelogged at a scale of 1 inch to 10 feet; the logs are presented asAppendix 4.
The pits were dug to check the alluvial flats as a source of earth-fill and impermeable material.
Drilling
The initial drilling programme was started at the end of July, 1966,and was completed in.early February, 1967. Water pressure tests were notcarried out in conjunction with the drilling programme, but have since beendone. Results are not included in this report.^Seven holes, totalling1,445 feet, were drilled along the proposed dam axis.^All but one, which isa vertical hole, were drilled at angles between 45 and 55 degrees to thehorizontal. The angle holes were designed to intersect the bedding roughlyat right angles (see Appendix 3).
Drilling was carried out by Water Resources Branch using aMindrillrig. A MC, triple tube core barrel with stationary split inner tube wasused in all holes; it gave very good to excellent core recovery in finelyfragmented and decomposed ground.^In sections of the alluvium, however,little to no core was recovered. One drill hole, ARG 5 1 deviated from itscourse.^The re-drilled hole is designated ARG 5A.
All core was photographed in the core boxes; in addition, eachlift from hole ARG 3. was photographed in the split tube, giving a permanentrecord of the core in an undisturbed state.
PHYSIOGRAPHY
The Adelaide River gorge lies within the "Uplands" physiographicdivision of the Northern Territory (see Malone, 1962, pp 4-6), with reliefgenerally between 200 and 350 feet. The terrain configuration is con-trolled by the type of rocks and structure present.^Greywacke forms long,steep-sided, rough ridges with fairly close dip-slope and scarp control;the ridges are separated by narrow valleys. Phyllite forms a more gentle,"scalloped" terrain with connecting saddles which can generally be negotiatedby Landrover.
The hills flanking the gorge rise up to 360 feet above the floorof the gorge; slopes are steep ; but only in one or two places are theycliff-like. The floor of the gorge is alluviated throughout. The rathersinuous course of the gorge is determined by a number of geological factors(see Plate 2). From the head of the gorge for about a mile the river isincised into, and follows the strike of, a sequence of west-dippingphyllite; the east side of the gorge is composed of underlying, resistant,
meta-greywacke. The river then cuts across the phyllite ) along the axis ofa north-plunging anticline. The north-west trending section of the gorge isthrough ; and across the strike of ; a sequence of meta-greywacke. Where ittrends north-east ; the lower mile or so of the gorge is again a strikevalley in soft phyllite; a branch_ of the Adelaide River Fault may alsounderlie this section of the gorge.
Alluvium has accumulated upstream of the head of the gorge.^Tothe south-west of the damsite ; ridges are separated by alluvial flats up toone mile wide. •
REGIONAL GEOLOGY
The general geology of the Adelaide River area is briefly des-cribed by Malone (1958).^The distribution of stratigraphic units in thecatchment area is shown in Plate 1. Much of the catchment has an alluvialand partially lateritised illuvial cover overlying the moderately tightlyfolded meta-sediments of the Finniss River Group. The group is LowerProterozoic in age and includes graded greywacke and siltstone of theNoltenius and Burrell Creek Formations.^These sediments have undergonelow-grade metamorphism to the greenscgist faciesa the regional plunge offolding is 34
0 on magnetic bearing 010 (see Plate 7).
In the south-east and south of the area, gently dipping sedi-ments of the Upper Proterozoic Tolmer Group unconformably overlie theLower Proterozoic strata. The group includes the Depot Creek and StrayCreek Sandstone members of the Buldiva Sandstone, the Hinde Dolomite, andsandstone and siltstone of the Waterbag Formation.^In some areas, ironhas been concentrated in outcrops of ferruginous, Depot Creek Sandstone,forming a medium to high-grade ; hematitic iron ore.
The Depot Creek and Stray Creek Sandstone Members are stronglyjointed and many springs emerge from them. A few of the springs areperennial.
The Adelaide River Fault cuts through the area in a north-easterlydirection.^It is marked by a narrow zone of silicified or ferruginisedfault breccia. Minor faults and branches of the Adelaide River Fault,are also present.
RESERVOIR AREA
GENERAL
• The catchment (Plate 1) covers 243 square Miles of the southernborder of the Northern Territory coastal plain. Within this border zonethe headwaters of the Daly, Finniss, Reynolds, and Adelaide Rivers inter-digitate. Two saddles limit the storage capacity; they are discussedlater in the report. The planned top water level for the storage is atarreduced level (R.L.) of 264 feet above mean sea level.^This gives astorage capacity of 300 9000 acre-feet and a reservbir surface area of -
5 9 450 acres (information from W.R.B.).
Mapping around the damsite revealed part of the successionwithin the Finniss,River Group. This sequence is indicated in Figure 1.The section was drawn along a line roughly parallel to the proposed damaxis. Thicknesses indicated are only estimates based on the mappingdone to date. Stratigraphic positions of engineering geologicalfeatures, mentioned within the text, are indicated on the section.
POTENTIAL LEAKAGE ZONES
„ There appearto be four possible paths of'Ieakage other thanthrough the. dam"foundations... They.are:
I) through beds within,the Tolmer Group.
2) along the Adelaide River Fault.
3) through the low southern saddle.
4) through the low northern saddle.
Leakage is not expected through the steeply-dipping meta-morphosed, Finniss River Group.
Tolmer Group
Only the Buldiva Sandstone is known to crop out within the storagearea, but the Hinde Dolomite and Waterbag Creek Formations may extend intothe southern part. Even if cavernous carbonate rocks are present near - thehead of the storage, leakage through them would be unlikely because of theextremely long leakage path.
To the west of the Adelaide River Fault, Depot Creek Sandstonedips to the south-east at 10 to 12 degrees ; towards the Adelaide River Fault.A few anomalous dips, in the opposite direction, occur along the fault line.Most of the sandstone is above the proposed top water level.
To the east of the Adelaide River Fault ; Buldiva Sandstone dipsgently (5 to 20 degrees) to the west, obliquely into the storage area. Thebeds abut against a branch of the Adelaide River Fault and are downfaultedagainst the Finniss River Group. The eastern and north-eastern sides ofthe reservoirwould have a barrier of Lower Proterozoic rocks at all pointseast of the Adelaide River Fault, therefore any leakage eastwards throughthe Buldiva Sandstone would have to find an outlet along the Adelaide RiverFault (which is discussed below).. Leakage to the south, into the DalyRiver system, through the Buldiva Sandstone is obviated by the very longleakage path - more than 16 miles.
Adelaide River Fault
Near the southern saddle, the fault, which dips steeply to thesouth-east in places (035 .degrees magnetic/86 degrees SE.), has downfaultedDepot Creek Sandstone against meta-silts -L(5 .12e and meta-greywacke of theFinniss River Group.. The fault is sharply defined. To the north-westof the saddle Depot Creek Sandstone abuts against meta-greywacke. At thecontact a vein of hard hematite ; one to two feet wide, contains a narrowband of breccia. The latter consists of friable sandstone fragmentswithin a hematite matrix. Thin hematite veins also occur parallel tocleavage in Some areas.
To the south-west, at the contact between sandstone and meta-siltstone, there are outcrops of silicified breccia up to 30 feet wide.The breccia consists of sandstone fragments in a crypto-crystalline quartzmatrix. The meta-siltstone is closely cleaved near the fault trace; inplaces the cleavage is contorted, elsewhere it is parallel to the faulttrace.
The fault line appears tight ; and has no springs associated withit (observations by the author and by D. Kneebone, Senior TechnicalOfficer, ICR.B.).^Any seepage comes out of near-horizontal fractures
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within the Depot Creek Sandstone (also see Hays, 1961, p6).^Leakage istherefore not expected along the fault. To confirm the impermeabilityof thefault, a - drill hole should be put down to intersect the fault andwater-pressure tests should be carried out, especially within the meta-siltstone near the contact (see below).
Southern Saddle (R.L. 277 feet)
The saddle lies within meta-siltstone.^Its north-west edgeis bounded by the Adelaide River fault-line scarp.^Streams drain to thenorth and south with gradients of 1:30 and 1:70 respectively.
During earlier investigations, the saddle, the "Eastern Low.Saddle" of Hays (1961), was considered as a possible spillway site; theneed for a cut-off wall was also considered. A resistivity survey wascarried out in 1960.^Attempts to check the results by augering werenot successful.^Since then, two costeans have been bulldozed to a depthof 6 to 7 feet.^The top 2 to 3 feet of soil consists of fine-grainedsand:washed down from the Depot Creek Sandstone to the west. Below thesand, highly weathered and lateritised meta-siltstone is present. Thismaterial has a high clay content.. Form interpretation of the geophysicalwork, the contact between the highly weathered and moderately weatheredmeta-siltstone is places at a depth of 10 to 20 feet below the surface,with moderately weathered rock to at least 40 feet.
The highly and moderately weathered meta-siltstone probablyhas permeabilities similar to those of the phyllite in the left bank ofthe damsite. Two shallow holes may be needed for water pressure testsand to check the depth of weathered rock.^In addition, the contactbetween highly weathered meta-siltstone and the Adelaide River Faultshould be water-pressure tested. A grout cut-off may be needed acrossthe saddle to make it water-tight.
Northern Saddle (R.L. 289 feet)
The northern saddle, the "'Western Low Saddle" of Hays (1961)/is steep sided with slope gradients ranging from 1:2 to 1:6.^The saddleis on the west limb of an anticline in cleaved phyllite, which in the rareoutcrops, is brittle and closelycleaved.^Cleavage spacing is from to1 inch.^In the saddle, cleavage strikes 018 degrees (magnetic) and dipsabout 80 degrees west. The strike is almost normal to the axis of thesaddle.^Unless cleavage is tight at depth, it may allow leakage.^Hays,(1961, p 7), noted that "joints appear to be open to a depth of between50 and 100 feet" (in outcrop on the saddle slopes), but drilling in the
left abutment of the dam indicates that the phyllite is generally tight,even close to the surface.^Since the shortest potential leakage path isonly 300 feet, careful water-pressure testing will be needed to determine thepermeability of the phyllite. For this purpose one or two, 60 to 70 feetlong, cored, diamond drill-holes will be required.
An anticlinal axis to the south-east of the saddle lies alonga ridge of phyllite, capped by cleaved meta-greywacke. On the east limbof the anticline the meta-greywacke dips to the north-east at 45 to 55degrees; the west limb is scree covered.^Along the synclinal trough inthe valley to the east, seepage was noted from bedding planes within themeta-greywacke.
If the water level is raised above R.L. 280 feet, water may leakalong bedding planes and joints within the meta-greywacke. If a maximumtop water level of 264 feet is used, water will have to pass through thephyllite to leave the storage area and the meta-greywacke capping shouldnot present a leakage problem.
DM/1 SITE GEOLOGY
LITHOLOGY
The damsite area consists of graded meta-greywacke and phyllite(see Plate 3 and Fig. 1). Meta-greywacke grades from pebble conglomeratethrough coarse, medium, and fine grained greywacke to phyllite, but not allgradations are present in every graded bed. Beds range in thickness from1 to 40 feet and crop out as elongate, steeply dipping ribs and slopingslabs.
Conglomerate bands, many of which are very friable at the surface,are composed of rounded quartz pebbles. Most of the pebbles are between
and 2 inches in diameter.^In places, the pebbles are sheared and ovoid.Bands are not everywhere continuous but tend to pinch and swell.^Shallowscour channels in underlying, fine-grained beds are commonly partly filled .with conglomerate. The conglomerate grades upwards into a quartz-greywacke.In places there is no transition and sharp contacts occur between coarse andfine bands.
The meta-greywacke consists of angular to sub-rounded quartzgrains set in a fine groundmass of sericite, quartz and minor quantities ofgreen chlorite. Under polarised light, most quartz grains show unduloseextinction, caused by strain; some are granulated, some are partiallyrecrystallised. Within the finer bands, fine cross-bedding is common.
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Outcrops of phyllitaare sparse; they occur as closely cleavedblocks and slabs protruding from a shallow soil cover,^The blocks are verysusceptible to soil creep.^The phyllite has a fine—grained groundmass ofquartz, sericite, and light—green chlorite.^In places, quartz porphyroblastsare present.^Holes ARG 4 and 6 intersect bands which consist of contorted,black, chloritic "slate", with highly polished shear faces.
Phyllite beds were originally siltstone, shale, or mudstone.Bands within the sequence still Show soft—rock structures such as load—casts,ball and pillow structures ; and fine cross and graded bedding.
Outcrops of both meta—greywacke and phyllite are locally silici-fied, especially close to quartz veins.
ALLUVIUM
Alluvium is at least 45 feet thick in the main stream.^Itconsists of sand, gravel, and stiff, impermeable, sandy clay
; silty clay,and clay.^Close to the valley sides, scree boulders are present.
In the watercourse into which it is proposed that the spillwayshould discharge, alluvium is from 4 feet to greater than 25 feet thick.The top few feet of clay is underlain by weak ; highly weathered andlateritised gravel.
STRUCTURE
.F.c2Ldirig
Both left and right banks of the damsite are on the moderatelysteeply dipping (40 to 60 degrees) east limb of a syncline, (Fig. 3).The synclinal axis follows the top of the ridge which forms the left sideof the valley and plunges north—north-east between 20 and 30 degrees.The anticlinal axis of a minor fold is exposed on the right bank, in acostean at R.L. 330 feet, near the proposed centre—line of the dam.Another anticlinal axis is exposed in the spillway costean, on the eastside of the right bank.
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Faulting
Apart from minor dislocations, (displacements of 1 to 6 inches),.along fractures, there is no surface evidence of faulting within the damsite.A number of shear zones were intersected by drill holes, especially withinthe phyllite (see Appendix 3 and Fig. 3).^In addition, one or two areas ofsilicified breccia,up to 1 foot thick, were intersected.
Drill hole ARG 7 passed through a possible shear zone from 45 to73 feet (28 to 40 feet, vertical depth), directly below the alluvium. ^Corerecovery was poor; the material recovered is fine, white clay containingangular phyllite fragments and five fragmented quartz veins. From 73 to85 feet (slope distance), the hole passed through finely fragmented andsheared phyllite.
The presence of contorted, fragmented, slaty zones in the phyllitealso indicates shearing.^These zones were intersected by drill hole ARG 6at depths from 128 to 256 feet (74 to 144 feet, vertical depth), and bydrill hole ARG 4 at depths from 69 to 200 feet (40 to 125 feet, verticaldepth).^All fracture faces are polished and have a vitreous lustre.
Jointing
Jointing characteristics of greywacke differ from those ofphyllite. In the phyllite, cleavage is the most prominent parting; itappears to parallel bedding.^Cleavage- spacing ranges from to 2 inches,near the surface, to greater than 8 inches at vertical depths of 100 feet.Cleavage planes are normally clean; some are slickensided or penetratedby thin, (41 to 1 inch wide), quartz veins. Near the surface thin clayseams, formed by weathering, are present along cleavage planes.
From observations of drill core, a set of joints dips at 30degrees in the opposite direction to bedding. Joint faces are clean; atdepth some are chloritic and highly polished, and a few are coated withOlears of pyrite. Another joint set dips at 60 to 70 degrees to the coreaxis in inclined holes. Near the surface, faces of this set are iron-stained and many have thin clay films. At depth, they are commonly coatedwith pyrite; slightly open joints contain small quartz and pyrite crystals.
Many bedding contacts between phyllite and coarse or mediumgrained, meta-greywacke are slickensided; bedding joints within the meta-greywacke are generally clean and tight, but many are iron-stained.Within the meta-g7eywacke, close to very close, (* to 12 inch spacing), .steeply dipping, (75 to 90 degrees), cleavage planes are arranged radiallyabout fold axes, especially anticlinal crests. Other partings are more
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widely spaced than in the phyllite.^In 30 measurements, the maximum andminimum joint spacings were 5 feet, and 1 inch 2 the average spacings beingbetween 21 inches and 5 inches.
From 160 joint measurements in the meta-greywacke, the major setsstrike and dip:
012-071 (3/16-48° Ey especially 024-049°/20-40 ° E.with a complementary set at 027-037 0/37-45 ° W. Further sets are:
002-0 11 °/44-51 ° E 9
069-0 863 /44.--56°098- 120°/58-66° NI106-11e/30-34° S.
(all bearings are magnetic).
In drill core ; joints at 30 to 45 degrees to the inclined coreaxis are the most common. Near the surface many of them have thin clayinfillings.^Steeply dipping joints commonly have internornecting voids,(1/10 to inch wide), contaIning quartz crystals with pyramidal ends.Some fractures within fine-grained bands are slickensided and coveredwith bright-green chlorite.^(After two or three months in the atmosphere,the chlorite breaks down into a green-white powder).
WEATHERING
Two classes of soil and scree covered areas have been distinguished;their distribution is shown in Plate 3.^In one class, soil cover is lessthan 3 feet thick, rock outcrop is scattered, and coarse, blocky scree occursin places. Rock does not crop out in the other class of area; soil andscree cover is at least 3 feet, and in places is over 7 feet thick. Nearthe base of slopes, scree material is partially lateritised 2 the rockfragments being completely decomposed and cemented by a weak, ferruginous,sandy clay matrix.
On the upper left bank there is only a thin soil cover with largescree blocks present.^This thin cover extends down to the break in slope,slightly below the hidden meta-greywacke, phyllite contact.^Below thebreak in slope scree increases in thickness both towards the base of theslope, (there is over 7 feet of lateritised scree in the bottom costean),and downstream of the dam axis.
- 12 -
The right bank has a thin soil cover. Near the base, and upstreamof the dam axis, there is only a narrow band of scree, generally 3 to 4 feetthick, which thins downstream.
The degree of weathering has been divided into a number of classesbased on the breaking response of the rock to hammer blows:
Table 1 Classification of. Degrees of Weathering
Class^ Rock Properties
Completely weathered^Relict.rock.fabric; behaves mechanically as soil
Highly weathered^Much clay associated with siltstone and phyllitewhich crumbles when crushed in hand; meta-grey-wacke friable and can be broken across the fabricby unaided hands.
Moderately weathered
Slightly weathered
Clay along fractures in phyllite; phyllite crumblesunder a 21b geological hammer blow. Meta-greywackebreaks under a moderate hammer blow; some of rockmay withstand hard hammer blows.
Rock slightly discoloured and stained along fractu-res; kernels of fresh rock between fractures.Strength slightly reduced from that of fresh rock.
Fresh^ Rock dark to light grey; no iron staining.Phyllite may bruise and break along cleavage planeswhen struck by a 21.1) geological hammer. Meta-greywacke rings when struck by hammer.
The effect of weathering and depth to which weathering extendsdepends markedly on the lithology.^In phyllite on the left bank, spacingof cleavage partings is dependelt on weathering: partings are closer spacedin the more highly weathered zones.^In drill hole ARG 5, highly weatheredphyllite extends to 20 feet.below the surface; in ARG 6 it extends to 70 •feet below the surface, (see Fig. 2).^Below these zones there is moderatelyto slightly weathered phyllite. Even at 140 feet below the surface, in drillhole ARG 6, phyllite is still.moderately weathered in bands.
Meta-greywacke in the right bank is not as weathered as the phyllite.There is less than 30 feet of highly weathered meta-greywacke in the top ofdrill hole ARG 1. The zone of moderate weathering decreases in thicknesstowards the valley floor; from 100 feet below the surface in ARG 1, to65 feet in ARG 2, and 65 feet in ARG 3. As on the left bank, the meta-grey-wacke is still slightly weathered 200 feet below the aLlIvial flats.
Weathering can be expected to extend deeper in anticlinal andsynclinal cores than on the limbs of folds.
• ENGINEERING GEOLOGY
From topographic considerations, five possible damsites wereselected within the Adelaide River Gorge, (see Plate 2).^Sites 2, 3 and4 were previously investigated by Hays (1961)3 the height of a dam atsite 4 is limited by a low saddle with a R.L. of 221 feet; sites 2 and 3May warrant further investigation before a final decision is made aboutthe present site, but preliminary mapping indicates that phyllite underliesmuch of the foundation areas for both sites.
The location of the present damsite, (site 1), was selectedbecause of favourable topography at the site, and because of the high,storage capacity available, as a result of the widening of the rivervalley just upstream from the site.
The initial investigation was planned to:
a) determine whether the site is suitable for theconstruction of a 100-foot-high dam, and if so
t) provide enough geological information to enable afairly accurate cost analysis to be carried outbThis is needed to determine the economic feasibilityof the scheme.
FOUNDATIONS
Left Bank
Little, to no, rock crops out on the left bank in the position ofthe proposed dam axis. Only above R.L. 375 feet, where a conglomerate andmeta-conglomerate sequence overlies the phyllite, is outcrop apparent.However, only a comparatively shallow cover of soil and scree overlies thephyllite. The cover ranges from 2 feet thick, half way down the slope, to7 feet thick at the base of the slope.^Phyllite is exposed in two costeans,at drill sites ARG 5 and 6, and along bulldozed tracks leading to the sites.Near the surface., phyllite is affected by soil creep. The rock is mainlysoft, weak, closely cleaved and fragmented.^During the investigation, waterrunning intermittently over a period of weeks, cut a trench 18 inches deepin parts of the costeans.^In drill hole ARG 6 2 the first 120 feet, (75feet, vertical depth), is in highly weathered phyllite.^The phyllite isrepresented by a sericitic and chloritic silt and silty clay for much of thefirst 50 feet (30 feet, vertical depth).
14 -
Soil testing procedures will be applic.able for the highly weatheredmaterial which has a low cohesion (c) and probably a low angle of friction(0.^(This opinion is based on tests by the Commonwealth Department of -Works on fill material consisting of highly weathered phylljtA of the NolteniusFormation from Fort Hill ; Darwin (see Braybrooke, 1967).^R.,sults from thetests were: c : 0-6 pounds per square inch (p.s.i.) and 0: around 26 degrees).As the phyllite is soft, it can be easily ripped and excavated using bulldozersor scraper dumpers.
The material will compact and settle when loaded, and will notwithstand high stresses; however, a, rock or earth fill dam, 100 feet high,should not impose high loads on the foundations. A potential failure surfacemay exist along the contact between highly weathered and moderately weatheredphyllite. Phyllite readily parts along cleavage planes and joints, many ofwhich have clay material associated with them.^Since the cleavage dipsinto the hillside, it will probably be less of a problem than the joint planes.
Results of water pressure tests are not available but it is expectedthat the phyllite may be more permeable-at depth than near the surface; thesilty and clayey material at shallow depths should make the upper zone com-paratively water-tight, However ; during drilling of holes ARG 5 and 6, com-plete loss of drilling water was recorded at depths up to 30 feet, (15 feetvertical); Water was seen draining out of the hill side below the drillsites.^If leakage does occur through the left abutment, because of the siltymaterial, there is a danger of piping in the top 80 - feet.
At about R.L. 140 feet in drill holes ARG 5, 6 and 7 pyrite occursas joint infillings. Thiswould tend to Jxidise to sulphate radicles in thepresence of cement grout and will attack the cement. Hence, if cementgrouting is to be used below R.L. 140 feet in the phyllite zone, sulphateresistant cement should be used.
River Bed
Results from drill holes ARG 3, 4 and 7 indicate at least 44 feetof alluvium overlying weathered bedrock.
Table 2^Depth of Alluvium in Drill Holes ARG 3, 4 and 7.
Hole ARG^Distance to weathered bedrock feetInclined^ Vertical
^
7^65 (possibly sheared^ 40 (28)bedrock below 43)
^
4^ 66^ 40
^
3^ 53^ 44
Me
eat
In ARG 7 ; most of the core recovered to 43 feet (28 feet vertical)is a leached and mottled, stiff, impermeable sandy clay with a few phyllitefragments, quartz ; and meta-greywacke pebbles and boulders. From 43 to 51feet (28 to 32 feet, vertical distance), there is a stiff, white clay with afew phyllite fragments; between 51 and 65 feet no core was recovered.Broken quartz veins and stiff, white clay occur from 65 to 72 feet (40 to 45feet, vertical distance), then to 84 feet, (50 feet, vertical), there ishighly weathered phyllite.
Little core was recovered from. the first 66 feet of ARG 4. Whatcore there is, consists of sandy clay and pebbles of meta-greywacke'andquartz.
Core recovery from drill hole ARG lwas also poor. The dAller'sshift reports indicate: 10 to 14i feet (7 to 11 feet vertical)-silty clay;14i to 30 feet (11 to 24 feet vertical)-clayey sand and river gravel withquartz pebbles and greywacke boulders. Directly below the alluvium, thereis moderately to slightly weathered meta-greywacke.
The drilling results suggest that a shear zone may have beenintersected by ARG 7 between 43 and 72 feet; further exploration will beneeded to confirm this. Further, it appears that the river may havepreferentially cut deeper along the contact between the meta-greywacke andthe phyllite, than elsewhere. This contact, which was intersected by drillhole ARG 4 at 212 feet, shows minor shearing of the phyllite.
Since sand and gravel beds may occur randomly within the alluvium,providing potential leakage paths, the alluvium may have to be excavated to .sound bed-rock or an impermeable cut-off provided in the alluvium. . Per-cussion drilling and geophysical work will be needed to define the distri-bution of the alluvium accurately.^If the alluvium is excavated, it may beusable as part of the fill material.
If it is decided not to remove the alluvium, a slurry trench cut-off composed of bentonite or a bentonite-cement mixture, or an upstreamimpervious blanket, (see Sherard, et. al., 1961, pp 304-308), may beapplicable.^Sheet-piling, with closure by cement grouting, could alsopossibly be used.
Right Bank
Elongate outcrops of graded meta-greywacke, dipping towards theriver, occur on the right bank. Between outcrops, particularly over fine-grained meta-greywacke and phyllite bands, there is a thin soil cover.The cover ranges from 1 foot, near the proposed dam crest, to 4 or 5 feetthick at the base of the slope; hence little stripping will be necessaryto expose the bedrock fully.
- 16 -
Near the surface, fine-grained met a-greywacke and phyllite bandsare very closely fractured to fragmented.^In the phyllite, clay-filledcrush zones are common near the sarface. At shallow depths, slickensidesin phyllite are prevalent, indicating differential movement between competentand incompetent beds, during folding.
Medium-grained meta-greywacke is closely fractured near thesurface, but generally the rock is moderately strong to strong at depthsof 5 feet or less.^Near the dam crest, there may be 10 feet of highlyweathered meta-greywacke, (see Fig. 2).
No bearing capacity problems are anticipated on this bank althoughthere may be some compaction of phyllite bands. Phyllite bands are alsoimportant as potential planes of weakness, especially since the beddingstrikes almost normally to the dam axis.^If high horizontal stresscomponents are applied to the foundations on the right abutment, slidingdownstream coulioccur along one or more of the weathered phyllite bands.
A set of joints within the meta-greywacke, dipping at 45 degrees,are open in part and have interconnecting cavities.^They constitute apotential leakage path^Careful grouting would be needed to make theright abutment water-tight.^Since bedding dips at 50 degrees, blanketholes may have high takes owing to grout passing out of the surface zone,down bedding planes.
Design Considerations
The profile of the proposed axis is suitable for a concretebuttress, earth or rock-fill dam. Because of poor foundations, cost ofcement and the probable lack of suitable aggregate and sand, a concrete damappears to be uneconomical. Hence the choice lies between a rock-fill damwith an impermeable core or an earth-fill dam.^Sufficient quantities ofrook-fill are present and pitting has indicated that large quantities ofearth-fill are probably also present near the site.
Since highly weathered phyllite on the left bank will probablycompact to a marked degree under the load of the embankment ; the damfoundations should be wide. Also, because of the difference in rock typeson either bank, differential settlement of the two sides is likely to occur,even if the left bank foundations were excavated to fresh phyllite.
These considerations call for either a rock-fill dam with a widecore-zone, or an earth-fill dam.^Soil mechanics studies should be madeon foundation material to determine the safe load and other design criteria.
■•••
-
SPILLWAY
The proposed spillway site is in graded meta-greywacke, on theright bank. A minor anticlinal crest is exposed at R.L. 300 feet on thelinesof the dam axis.^This is close to the proposed spillway crestposition. The spillway channel will probably slant down the back slopeof the right bank, running across the strike of the bedding at a shallowangle. .A spillway channel in this location would pass over an anticlinalcrest near the base of the slope.
The right wall of the spillway cut will have to be cut at anangle no steeper than the bedding dip of 50 degrees. Material excavatedfrom the spillway may be usable as rock-fill.
Shallow drilling will be needed along the spillway centre lineand at the site of the energy'dissapator, wherever positioned, to deter-mine the depth of weak, weathered rock.
CONSTRUCTION MATERIALS
ROCK-FILL
If a rock-fill dam is decided on, between 500,000 and 1,000,000. cubic yards of rock will be needed (the Figures are very approximate;they are based on estimates by W.R.B.).^Available sources are:
a) the meta-greywacke of the Noltenius Formation; and
b) the Depot Creek Sandstone.
Noltenius Met a-greywacke
Geological Succession and Structure
The ridge that forms the extension of the left abutment consists'of a folded sequence of meta-greywacke beds. The beds are from 4 to 40feet thick and grade from a quartz-pebble conglomerate through coarse,medium, and fine grained greywacke to phyllite.. The sequence, which is800 . to 900 feet thick, occurs stratigraphically between thick sequences ofphyllite. A synclinal trough extends along the centre of the ridge, withan anticlinal crest on the western edge and a probable synclinal troughhalf way down the western slope, (see Plate 3 and 5)0
Outcrop is generally sporadic and the western dip slope is almostcompletely scree-covered, but conglomeratic bands provide useful members forcorrelation of beds.^A number of sections paced across areas of fairlycontinuous outcrop have been interpolated and projected onto sections ABand C-D. From these, a composite stratigraphic column of beds in the quarrysite has been built up (see Plate 6). The thickness of beds in this columnhas been reduced to true thickness.^Since individual beds lens and swell,the sequence presented in the column is generalised and approximate. Abovethe succession in section C-D, there is another 400 feet of meta•greywackewhich is closely cleaved in outcrop. This lies outside the proposed quarrylimits, (see Appendix 2).
Suitabilit for Rock-fill
NIEl_a■clsf_?JL At the surface the meta-greywacke varies inquality.^In places it is strong and partly silicified; in other areas,especially where it is close to fold axes and where it is fine-grained andmicaceous ; the meta-greywacke is closely cleaved, highly weathered andfriable. Further, the matrix of conglomerate and very coarse-grained sandbands tends to be weathered, producing a friable material.
Some of the mica-rich meta-greywacke may have poor aggregate.shear-strenek characteristics. When wetted, both its compressive strengthand its sliding friction angle are expected, to decrease.^(When wetted,the sliding friction angle of mica decreases markedly, see Horn and Deere,1962).^Samples will have to be submitted to the appropriate strength anddurability tests.
Phyllite is:very.weak at the surface.Information from drill holes ARG 1,23 and 4 indicate that phyllitic inter-beds are also weak and fragmented at depth. Hence, on working, it willproduce excessive fines.
Thinting!..., Pronounced jointing in. meta-greywacke, within the area,produces natural blocks from 1 to 10 cubic feet in volume. The blocks rangein shape from plates and elongate blocks to cubes; elongate and plateyblocks predominate. From measurements of 60 natural blocks taken at random ;
the average ratio Of diameters was 1:1.6:2.5.
Near fold axes, meta-grepracke at the surface is closely cleaved,with plates down to half an inch thick.
Bulk Properties: Using information from Fig. 4, the section hasbeen divided into four rock-type divisions ° For each rock type, thecumulative thickness, percentage of section, comments ; and likely propertiesas rock-fill, are given in Table 3.
-19-
Table 3 Likely Volumes and Properties of Rock Type Divisions withinProposed Quarry in Meta-greywacke.
Rock Type Cumulative^Percentagethickness^of totalin section^section
(feet)^thickness
Comments LikelyPropertiesas rock-fill *
Phyllite
No Outcrop
Fine-grainedmet a-greywacke 9 .
friable atsurface
^
20^4^Little outcrop.^Weak; will crushVery closely^on working,fractured to^producing fines.finely fragment-ed at depth.
^75^16^
Probably mainlyweak rock produ-cing excessivefines on working.
^
105^23^Commonly highly^Weak to moderatelymicaceous with strong. On workingpoor bond strength. will produce blocksModerately to and moderate fines.closely fracturedat depth.
Fine-grained^260meta -greywacketo conglomerate
••■=am'OCNII-Jaw•
57 Moderately toclosely fracturedat surface and atdepth.
Moderately strong.On woiking willproduce blocksand some fines.
460^100
* (Opinions based on observations from outcrops and core; will need confir-mation by drilling and suitable tests).
Quantities of Rock-fill
Assuming the proposed quarry floor to be at R.L. 250 feet, the quarrysite, (see Appendix 2), shouadcontain 1000,000 cubic yards of rock-fill.^Thesite mainly lies within the east limb of a syncline.^It also has an anticli-nal axis running through its centre, (see Plate 5).^To prove the quarry,using geological deduction, 580 feet of drilling and 800 feet of costeaning isneeded, (see Appendix 2 for detailed recommendations).
Should the volume of suitable material be inadequate, the proposedquarry could be extended horizontally in any of three directions, or the floordeepened, and still remain within the meta-greywacke sequence. Phyllite would
0 -
probably be encountered in the qarry floor if the anticlinal axis is followedtoo far towards the south.
Large blocks suitable for rip-rap are expected in sufficient quan-tities, but they would probably have to be stockpiled as produced.
1122aLgrtgk Sandstone
Along the Adelaide River Fault there are a number of scarps up to90 feet high in Depot Creek Sandstone.^The rock is a'well-bedded, strong,partly siliOified ; fine-grained quartz sandstone. Though no estimate hasbeen made of the volume of rock present, the sandstone could possibly beused as rock-fill. However ; the silicification may be a superficial pheno-menon.^If so 9 the sandstone at a fairly shallow depth is possibly too softand friable to be used for rook-fill. Drilling would be required to checkthis, Further, owing to pronounced bedding, the sandstone would possiblybreak into platy blocks when blasted,
IMPERVIOUS MATERIAL :
,^.^•The only suitable material for use ih an impervious bore is the
sandy -clay alluvium that occurs extensively.in.the valley of the AdelaideRiver. Large alluvial flats ; of an unknown thickness (possibly up to 40feet thick in places), have been formed above the head of the gorge. Anumber of them have been pitted to determine the quality and quantity ofthe material. From a superficial examination ; the alluvium ranges fromclay to a well graded (?) sandy clay with moderate to high cohesive strength.In most pits the top 1 to 2 feet consists of a grey-black ; non cohesive soil,underlain by red to pink sandy clay. The alluvial deposits have been in-vestigated by engineers of Water Resources Branch.
The volumes present have not been estimated but more than enoughmaterial has been proved for an impermeable core. If an earth-fill damis decided on, there would probably be adequate supplies of alluviumwithin a mile of the damsite.
If alluvium at the damsite is removed, this may be usable as earth-fill material. That recovered from coring is a stiff, sandy clay to clayand appears impermeable.
Since there may be sandy lenses within the alluvium ; it would haveto be thoroughly mixed to prevent a permeable zone being formed inadvertently.Representative samples will have to be stble3ted to the usual laboratory tests.
-21-
SAND
No suitable sand deposits have been found near the damsite.Deposits of fine-grained, pink quartz sand form flats below the AdelaideRiver Fault. This sand is derived from the Depot Creek Sandstone. Itappears to be too fine-grained for use in concrete without blending, butno grading tests have been done on the sand, and no estimate has beenmade of the volume of sand available.
Suitable sand is reported to have been located in the bed of theriver, below Adelaide River township.
AGGREGATE
The most suitable source of aggregate appears to be crushed v...silicified, Depot Creek Sandstone or crushed meta-greywacke.^If these .sources prove unsatisfactory, commercial sources, such as the 'AustralianBlue Metal' quarry at Acacia Creek, may have to be used.
CONCLUSIONS
From geological considerations, the construction of a 100-foot-high rock or earth-fill dam at Site No. 1 is feasible.
The depths of alluvium and highly weathered phyllite, whichform the left abutment and foundation below the river, are the maindisadvantages of the site; they are up to 45 feet thick.^The rightabutment is composed of strong, elastic meta-greywacke. Therefore,differing response to loading by the dam embankment, across the site, willrequire a design and embankment material which will accept differentiaLfoundation settlement.^-
As water pressure tests were not carried out in conjunctionwith the drilling programme, no conclusions can be reached as to thepermeability of the foundations.
Testing will be necessary to determine whether leakage will occur' through the Northern and Southern saddles.
Ample rock and earth-fill materials. appear to be available closeto the site.
If the profiles of Sites 2 and 3 suggest that volumes of embank-ment would be similar to that required for Site or that any added embank-Ment volume for Site 2 or 3 would be fully offset by the cost of excava-tion and foundation treatment at the No. - 1 site further geological in-
- vestigations should be carried out at Sites 2 and 3 before a finaldecision is made about Site No. 10
RECOMMENDATIONS
Collar positions of the drill holes and costean centre linesshould be accurately surveyed with respect to the damsite grid. . Ifdrilling is carried out in the proposed quarry site, the grid will haveto be extended to cover this area. All drill holes should be preservedby cementing in stand pipes to which screw caps can be fitted, and shouldbe clearly Marked.
'Should it be decided. to construct a dam at Site No. 1 9 additionalgeological information will be needed on which to base the design of thedam. However ; before a final decision can be made on the site ; furtherpreliminary geological investigations may be necessary of Sites 2 and 3(see Conclusions).^Information available indicates that phyllite ispresent within the foundation areas of both sites but that thicknesses ofalluvium may not be as great as at Site 1.
The following design investigations are recommended:
1) Samples of the highly weathered phyllite on the left bankrequire in situ and laboratory tests to determine mechanicalproperties and permeability.
A programme of seismic work in conjunction with patterndrilling is necessary to determine the thickness ofalluvium and highly weathered phyllite. At least six50-foot percussion holes will be required initially. Onthe left bank 2 the boundary between alluvium and highlyweathered phyllite will be difficult to distinguish,Excavation limit may have to be based. on mechanical tests.of representative samples.
After the seismic survey ; further diamond drilling willprobably be needed to test suspected shear and faultzones, or other zones of low velocity.
4) Further costeaning and sluicing of the right bank isdesirable to provide more detailed information on the
- 23 -
amount of "dental work" (caulking of joints, minorshears and pockets of deep weathering with concrete)neede4,and to determine whether a satisfactory foundationcan be obtained without trimming of the rock.
5) Shallow drilling and seismic testing will be requiredalong the spillway centre line and at the dissipatorsite.^At least three, vertical, 30-foot diamond drillholes will be required along the channel to determinethe depth of weak, weathered rock. The whole of thespillway area should be cleaned down, sluiced, andmapped in detail by a geologist.
6) Some design drilling and geological mapping will berequired for any diversion works that may be required.The work necessary cannot be indicated until the natureof the diversion works, if any, is decided.
7) 580 feet of drilling and 800 feet of costeaning will , berequired in the proposed quarry site in the meta-g,Tey-wacke, (see recommendations in Appendix 2).^Sampleswill have to be subjected to appropriate strength anddurability tests. Further drilling may be needed forcontractual purposes.
8) The necessary quantity and quality of earth-fill materialwill have to be proved by the appropriate field andlaboratory studies.
The permeability and thickness of highly weatheredphyllite will have to be determined in both the Northernand Southern saddles. This will require one or two
1^diamond drill holes in each saddle.^These holes shouldreach a depth of 60 to 70 feet and be water-presure tested.
10) At least one hole should be drilled through the AdelaideRiver Fault and be thoroughly water-pressure tested.
- 24 -
REFERENCES
BRAYBROOKE 9 J.C. (1967) - Stability of the cut bounding the Fort Hill ironore dump area Darwin Northern Territory. Bur. Min. Resour._Aust. Rec. 1967/24 (unpUbl.).
HAYS 9 J. (1961) - Preliminary geological investigation of Adelaide Riverdam site 9 Northern . Territory. Final Report. Bur. Min. Resour._Aust., Rec. 1961/83 (unpubl.).
HORN 9 Hall. and DEERE 9 D.U. (1963) - Frictional characteristics of minerals.Geotechniou,e 12 2 (4):3i9-335
MALONE 9 E.J. (1958) . - The geology of the Darwin- Adelaide River area ;
Northern Territory. Bur. Min. Resour, Aust. Rec. 1958/96(unpubl.).
ROSENTHAL 9 C.C. (1948) - Report on proposed hydro- electric projects 9
Adelaide River 9 N.T. (Unpublished Report)
SHERARD 9 J0L. 9 WOODWARD 9 R.J0 9 GIZIENSKI 9 S.F. ; and CLEVENGER ; W. (1963) -EARTH AND EARTH-ROCK DAMS; ENGINEERING PROBLEMS OF DESIGN ANDCONSTRUCTION. Wileq 2 N.Y.
WOOLNOUGH 1 W.G. (1963) - Report on geologioal,aspects of the proposedwater supply for Darwin, N.T. (Unpublished Report - File 45/
— ?5 . -
APPENDIX_ 1
DEFINITIONS OF SEMI:AVANTITATIVE DESCRIPTIVE TERMS
Grade Scale
Pebble^ 4 to 64 mm
Very-coarse-grained sand^2 to 4 mm
Coarse-grained sand^ A A-I U0^mm
Medium-grained sand^ +4; to 1 mm
Fine-grained sand^ to imm
Fracture Spacing
Very wide fracturing^ >10 feet
Wide fracturing^ 3 to 10 feet
Moderate fracturing^ 1 to 3 feet
Close fracturing^ 4 inches to 1 feet
Very close fracturing^1 inch to 4 inches
inch to 1 inchFragmented
Finely fragmented
Hardness
Hard to very hard
Moderately hard
Soft
Impossible to scratchwith knife blade.
Shallow scratches withknife blade.
Deep scratches withknife blade.
Percussive StrengilLof Rock
Strong to very strong
Moderately strong
Weak
Not broken by repeatedblows with a 21bgeological hammer.
Rock broken by 3 or 4heavy blows with a 21bgeological hammer.
Rock broken by one blow(includes brittle,fissile, friable andflaky rocks)
— 26 —
APPENDIX P.
SVARRY SITE ADELAIDE RIVER GORGE
Assuming the proposed quarry floor to be at R.110 250 feet andusing geological deduction, 580 feet of drilling and 800 feet of costeaningshould prove an adequate volume of rock—fill material (about 1,000,000cubic yards).
There will be sufficient drill core to silow. an estimate of thevolume of fine—grained material present and to indicate the effects ofcleavage at depth. The core will have to be logged and samples subjectedto appropriate strength and durability tests.
To prove an adequate volume of rock—fill for contractual purposes,an extra 420 feet of vertical drilling may be desirable0^fl'his drilling,however, would presumably be undertaken at the design investigation stage.
Should there be an inadequate volume of suitable material, theproposed quarry could be extended horizontally in any of three directions,or the floor deepened, and still remain within the greywacke sequence.However, phyllite would probably be encountered in the quarry floor if theanticlinal axis is followed towards the south.
The drill sites and specifications in the attachments differ from. those previously set out on the ground.
ARG 8: This position is the same as that already blazed andpegged as 8.
ARG 9: This position is situated immediately above a conglomerateband about half—way between pegged positions 11 and 12.
ARG 10: This position is fifty feet downhill from that blazed andpegged as 10.
Costean h—h', 200 feet long, is to locate the Mid axis and to tryto locate a conglomerate marker band on the west side of the anticline.
Costeans j—j' (100 feet long) and k—k' (500 feet long) are toexpose the sequence in the area of no outcrop, to locate any possible faultsand to locate the known anticlinal fold axis and any other fold axis thatmay be present lower down the hill.
- 27 -
SPECIFICATIONS FOR DRILLING
DRILL HOLE No. ARG 8^TEMPORARY^
FINAL
TYPE. OF DRILLING: Diamond drilling with NKLC stationary triple splitinner tube
LOCATION: Quarry Site
OBJECTIVES OF DRILLING: To determine the stratigraphic sequence
SITE INDICATED By:- Peg painted red and blazed trees
DRILL SITE PEG, CO-ORDINATES:^E 1226000N 9935050
METHOD OBTAINED: From photogrammetric contour plan C & L 430/D
DRILL SITE PEG, R.L. OF GROUND SURFACE: 390'METHOD OBTAINED: From contour plan as above
DIRECTION OF HOLE: 278 ° Mag.^INDICATED BY:
REQUIRED SLOPE (ANGLE FROM HORIZONTAL): 45 0REQUIRED SIZE: NNILC
REQUIRED DEPTH (IN TERMS OF OBJECTIVES): Drill through the stratigraphic
sequence in the area of no outcrop.
ANTICIPATED DEPTH:^130 feet
ANTICIPATED DRILLING CONDITIONS (STRATA, STRUCTURES): Conglomerate,greywacke and phyllite : Hard, abrasive drilling
WATER PRESSURE TESTING REQUIRED: No
SPECIAL REQUIREMENTS: Core to be photographed in trays. Core to beplaced in trays and kept in good condition for future reference -preferably wooden trays.
SITE SET OUT BY:^ DATE:
J.B. Braybrooke
ENGINEERING GEOLOGIST
— 28 —
SPECIFICATIONS FOR DRILLING
DRILL HOLE No. ARG 9 TEMPORARY
FINAL
TYPE OF DRILLING: Diamond drilling with NMLC Stationary •triple splitinner tube.^.
LOCATION: .Quarry Site
OBJECTIVES OF DRILLING: To determine stratigraphic sequence. To-^investigate cleavage at depth.'
SITE INDICATED BY:
DRILL SITE PEG, CO—ORDINATES; E 1225860N 9935095
METHOD OBTAINED: From photogrammetric contour plan C & L 430/D.
DRILL SITE PEG, R.L. OF GROUND SURFACE:^414.feet
METHOD OBTAINED: From contour plan in above'
DIRECTION OF HOLE: 278 ° Mag.^INDICATED BY;
REQUIRED SLOPE (ANGLE FROM HORIZONTAL): 45 0REQUIRED SIZE: NMLC
REQUIRED DEPTH (IN TERMS OF OBJECTIVES): Drill through the stratigraphicsequence in the area of no dutcrop. Drill 20' below proposed quarryfloor level.
ANTICIPATED DEPTH: 270'
ANTICIPATED DRILLING CONDITIONS (STRATA, STRUCTURES): Conglomerate,greywacke and phyllite. Hard, abrasive drilling. .
WATER PRESSURE TESTING REQUIRED: No
SPECIAL REQUIREMENTS: Core to be photographed in trays. Core to beplaced in trays and kept in good condition for future reference -preferably wooden trays.
SIZE SET OUT BY:^ DATE:
J.C. Braybrooke
ENGINEERING GEOLOGIST
SPECIFICATIONS FOR DRILLING
DRILL HOLE No. ARG 10^
TEMPORARY^FINAL
TYPE OF DRILLING: Diamond drilling with NMLC Stationary triple splitinner tube.
LOCATION: Quarry Site
OBJECTIVES OF DRILLING: To determine stratigraphic sequence. Toinvestigate cleavage at depth. To determine plunge of anticline.
SITE INDICATED BY:
DRILL SITE PEG, CO-ORDINATES: E 1225505N 9935080
METHOD OBTAINED: From photogrammetric contour plan C & L 430/D
DRILL SITE PEG, R.L. OF GROUND SURFACE: 340 feet
METHOD OBTAINED: From contour plan as above
DIRECTION OF HOLE:^109° Mag ,^INDICATED BY:REQUIRED SLOPE (ANGLE FROM HORIZONTAL): 45 0
REQUIRED SM. NMLC
REQUIRED DEPTH (IN TERMS OF OBJECTIVES): Drill through stratigraphicsequence. Drill into core of anticline to greywacke-phyllite
. contact. Drill 40' below proposed floor level.
ANTICIPATED DEPTH:^180!
ANTICIPATED DRILLING CONDITIONS (STRATA, STRUCTURES); Conglomerate,greywacke and phyllite : Hard, abrasive drilling.
WATER PRESSURE TESTING REQUIRED: No
SPECIAL REQUIREMENTS: Core to be placed in trays and kept in goodcondition for future reference - preferably wooden trays.Core to be photographed in trays.
SITE SET OUT BY:^DATE:
J.C. Braybrooke
ENGINEERING GEOLOGIST
APPENDIX 3
GEOLOGICAL LOGS OF DIAMOND DRILL HOLES AT SITE t
PROJECT^A0142,1 CIffOle^Fk ; v iwv-- _a_o_r4g,Zgkw,aae.No■ HOLE NO
.9 IR c.^1
SHEET --1-
BUREAU OF MINERAL RESOURCES,^ •LOCATION
GEOLOGY AND GEOPHYSICS .^ ...^ 90^ IRE^;GEOLOGICAL^ ANGLE FROM HORIZONTAL^ D^CTION th" 4cc. 1LOG OF DRILL HOLECOORDINATES^ R L
a^tsPFrC O rvWEATHERINGF :DESCRIPTION
, ■TH01000, COLOUR, STRENGTH, HARDNESS, ETCG RAPHIC
.00°Er^f NACWRE^IT
SIZE 0°^.-00^% CORE -CORE^RECOVERY
STRUCTURESJOINTS, VEINS, SEAMS, FAULTS, CRUSHED ZONES
5 „,--1i ti'
WATER PRESSURE TESTLOSS An gallons per minute per tool
1^IllIliLl
g
N o
COr. ere
Co no re 0( , Mt: I 1(^'^I1^1^J^1
,^1^1
rnocit,t5-/-eir^40
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a as yt./4 eje a
1:31661+, P1--.11 C■n01 •••14e, weak
'40 ValookIllAhLy $4-ne• ...
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9 ......r....1.e.^.....:i 1,^Son1.6. 9 k iy^1...c...ofiks•-...1 -11.%;,,
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FRACTURE LOG^Number .1 fracture. o.• fool 01 core^lanes at rare loss are Mocked onBEDDING^AND JOINT^PLANES - AN',, are measured relative to a Wane normal to the core Olos
C.43- , 01.5. 1 9,^:. teelyrmeAMIA ,M1 11.4^(.424P,, .^SeleLeadt
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WATER PRESSURE TESTSFitt)^-^tiyal ......?,41 :C.^
CORE BARREL TYPE^-r.- ;p i ePACKER TYPE -
SUPPLY I IRE - - _ _.$ fe.13^j,,, e,,,m.^4,,,,...be...
DRILLER __ ...a._ rilf,A;&_
COMMENCED^16 6 .
VERTICAL SCALE
`.a.,na.an au. gauge pressur•*Test sectIone ore Indicated proohtcolly by tome.. el,*
PHOTOGRAPH REFERENCE SYSTEM77
COUPLE TED^q^- --
LOGGED BY __f; ir-veb.o_e_kre_VERTICAL SCALE - .1 . -_,s- IQ #-. -
BLACK^AND WHITE^.^. .
........-
COLOUR^ _ -....,
- --- --
•
,^ PROJECT ^14444da.144 411^Rj.vdte-^Ciplip,^;,...L^,^Neff. -^..,
BUREAU OF 'MINERAL RESOURCES,LOCATION
Hsu ..i
'FIR^I
SHEET A.. OF
GEOLOGY AND GEOPHYSICS
GEOLOGICAL LOG OF DRILL HOLE^ANGLE FROM HORIZONTAL^90^ DIRECTION^I1e•44 404COORDINATES^ -^ R L
ROCA 'YR(• DE OPEC^Of WEATHERING
DESCRIPTIONoTHOLOGY, COLOUR, STRENGTH, HARDNESS, ETC LOG
DE:TN^nizt^LT
SIZE Of^LOG^% CORECORE^ECOVCRV
STRUCTURESJOINTS, VEINS, SEAMS, FAULTS, CRUSelE0 ZONES
tt et.3 '..1
WATERLem A Q011001
PRESSUREpr. mmte
TESTper foot
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DR ,LL ', PE^111;•'01.48NOTES
FRACTURE LOG^Number of fractures por foot of core^Zones of co,^loss ase blacked inBEDDING^AND JOINT PLANES - Angles ore f1160.11d , .10110. /0 a wont normot to the co. oats
WATER PRESSURE JESLS
PACKER TYPE _ ___ _^_^_^_
SUPPLY LINE -- .^—
VERTICAL SCALE
T IED —_-_fri-ySkt42, Et. Ke. ^
CORE BARREL TYPE^,;pie.-1"_ Sfisli_;,..see-^-Lbe.DR•t.ER_ ae^rile..1:z.
Fes, s•ctIons ore tnolcoted ormshteo. r RY smAIHM^. o'REE
PHOTOGRAPeREFERENCE SYSTEMCOMMENCED^30/-7/66COMPL E T E 0 ___V2.1"
BLACK USA) WHITE^_LOGGED 7)_14104,14L
VERTICAL SCALE — -
COLOUR
PROJECT
LOCATIONBUREAU OF MINERAL RESOURCES,GEOLOGY AND GEOPHYSICS
r ^DIRECTION 3 5 • Masa 04 41‘.
GEOLOGICAL LOG OF DRILL HOLE4 5 °ANGLE FROM MORIZONTAL
SHEET^ AL^COORDINATES
LIFTa
% CORECOVE
uRELOG
memI.OG1 SIZE OF
CORE
Koce TYPEIS DEGREE OF PE ATPER1NG
WATER PRESSURE TESTLon ■n gallons PP mon99 04v foot
1^1^ 1111
DESCRIPTION•HOL OGY, COLOUR, STRENGTH, HARDNESS, ETC
STRUCTURESJOINTS. VEINS, SEAMS, FAULTS, CROWD ZONES
co Cart& Co^e 40(
Ft.k mnd
steoal 80-4
+o R4Lykgiv-aL ovaa -ka -s reywo oke:.
la,"&e. con s; 6450 ^se,a.^9....ot
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4;1144
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.1, be cit.,4 ,1,ww9k 4loarport ;;,^a.% lo qo
a; ' IF ^coma, 4,44.am
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eteNSGisibie n4iSL fie's f 50 ' s
have -W.. C.4007 ta; m9 my".
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^p ky II;^bo_as,-C+a^6 ,Vir, 0 *- sj 7
41.5!St: aka-. 544 s^s
rallat .
64re- 60' 6 " G'S.S^C lay --C; it at.at
70'- 70 " ea..40,rod,
sltalea.,statta ehyillie.
6•41,1;.q d.p 10
DR I
E E 0 _ __Kyriar_ea•• 14C_
CORE BARREL TYPE ^
.Sit4+^+Label._
it E^• Wito-.: 2,
COMMENCED 1L1: 64CONNATE° fg g 64LOGGED a. 3243!" 4109brNao,
1vt PTICAL SCALE _^•r". 1° -
NOTES
FRACTURE LOG • thenber of Pampa per foot of Coto Zona of Co.. Mu ore bloated in
REDOING AND JOINT PLANES — KatUs 0l0 beacrea realm* to o Wane normal to Km core alia
WATER PRESSURE TESTS
PACKER TYPE
SUPPLY LINE
VERTICAL SCALE
hat. Pao o•• 50551 preparesTat actions or, tn4icota gtophico0y by lambed M
PMOTOGRAPH REFERENCE SYSTEM
SLACK AND WHITE .^_ _
COLOUR
•••
.9
PROJECT^;1s .ititliMarrefiell"1111E,^3...^Ale.BUREAU OF MINERAL RESOURCES, LOCATION
^
HOLE^F110^•
RR G. a^SHEET a ^OF &-
GEOLOGY AND GEOPHYSICS^ •
ANGLE FROM HORIZONTAL^• 459DIRECTION , 0 0^010, w 4.4 i cGEOLOGICAL LOG OF DRILL HOLE
COORDINATES^ R L
ROCK TYPE• DEGREE^OF WEATHERING
DESCRIPTION,ITHOLOGY. COLOUR, STRENGTH, HARDNESS. ETC I^LOG
LIFTDEPTHp^RAC'URE^p^ STRUCTURES
I SIZE OF I^LOG^FY. COREIPI JOINTS, VEINS, SEAMS, FAULTS, CRUSHED ZONESCORE^RECOVERn
ix ,b.1 u.1;7 s
WATER PRESSuRE TESTLose^w golloOS Aer mmule per fool
I^I^1111
a , S
We CA k i y
W4aa+kee-eca
114 ET A -
AKEGREYWC
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000001!.00
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0.01rkilid0.110 10000/0000.0. 11001.0..00°
1.7100Ei
0.0010000:$00:010010.OROgrill!:°:;171110:,01:0!01•01.1.-0000410:011.4011—0000006006
0
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ale
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a.4.-44....____
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ORAL TYPE^r"411', .. 1 /LeplEg^.
FRACTLME LOG^Romper of tractor. per foot of core^Zones of core Ion ore Wenn in^.
BEDDING AND JOINT PLANES - AnoNs ore meowed relative to a p■ele norrno■ to the core owe
.
'''^&^'#
WATER PRESSURE TESTS
FF ED^FiyAnam, tr.C...—
CuPPlY 'NE - - - - - - - -VERTICAL SCALE
4.0RE •ARREL TYPE^Te;f1 lesp I; lc^;•.....,^_ +... be. s__
DR — ER ____.a. nlo•N; 2._ ^COMMENCED^—ALI 46.___
■-•vres p•von are gauge rrien,r01.,r $0,Jorlf are melcofed grateh , ccny by bk..^n %woe
PHOTOGRAPH REFERENCE SYSTEMCDMPL E FE D^/7 . .6.: 66COGGED ev 7: Br-aybevokp
Blb, ANO WmIT^.^_^. -
Vr I/VEAL SCALE^I " '110 '
.
COLOUR^'^- ----.
___^—
PROJECT^fideAqi cie^Rive.-^ove.^pc%^Si -+v_^No.^. NOt E NO
19 g G 3
SHEE T^I^OF 3
BUREAU OF MINERAL RESOURCES, LOCATIONGEOLOGY AND GEOPHYSICS
coGEOLOGICAL^OF^ ANGLE FROM HORIZONTAL^---,-
..„„r..,a^DIRECTION 135 0"1 .43"63 ;(--LOG^DRILL HOLE
COORDINATES^ R L
atoce^TYPE5 DEGREE^Of^WEATHERING
DESCRIPTION
Of HOLOGY, COLOuR, STRENGTH, HARDNESS, ETCLAC
,OG"PT^RACLRE^1StLpF^LOG
RECOVER
srRuCTURES
JOINTS, VEINS, SEAMS, EAULTS, CRUSHED ZONES.
. 'La tili ,1
WATER PRESSURE TESTLOSS^n quAo55 DO, mInut• RV MO ,
1111^111^l
g'
•
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op/ osNi^,,,.(;.--..e..-1;e:.t.. _
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con.t.^TYPE^;Id-_ft rit_Dllt§
,RACTURE LOG^Number of NoVores or foot of care^Zones of core Ioss o•• bloated in
BEDDING^AND JOINT^PLANES - Angles cve rneasurao rsioNve to a piana norm°, to the core Call
)
,
WATER PRESSURE TESTS
FEED^Hyde-at...1;c PAcKER TYPE^_ •^___
SUPRL Y t ME - _CORE BARREL TYPE _.^T.-:1:21 ..
_Sp I; I.^;,,,,e...-^I -,-..b e_ VERTICAL SCALE
DRIL,FR^Ca^grOICEn ; Z. F','''•, ..•^ .'• ga.p. PressuresTes• sections ore Indic.. Cr1(1111.11,^by^PlatIma^■s, str ,ps
PHOTOGRAPH REFERENCE SYSTEMCOMMENCED^24. •-:- ^• 6 6^I
13.9.66COMPLETED -_^.^_^-- _____
LoG5CO BC. I 13",Lyb.-0 0 k e_.L., , •^SCALE^1' 1-11.,
81 AC K^AND WHITE^ -^- -^-
-
COLOUR _ _,-- — —
,
•■•
PROJECT^A id 10.14S i 44 a^Wye."'^0 I. e^ot^s ;+.4z-^No.^1. HOLE No.
/9 A 4 3,^•
SHEET -2%. OF _12—
BUREAU OF MINERAL RESOURCES,^LOCATIONGEOLOGY AND GEOPHYSICS
ANGLE FROM HORIZONTAL^45 °^ DIRECTION I '35 . fr169" ."41'GEOLOGICAL LOG OF DRILL HOLECOORDINATES^ R L
ROCK^TYPYA OEGREt^TO^wF•14[ItItNG
DESCR■RT iON.7,40,CIGy. COLOUR, SYNENGTN. ol■Roon SS^t Fc SI LIFTDEPTHa^RACWRE^a
SIZE Of^L OG^rY., CORECORE^RECOVER
.^STRUCTURESJOINTS, VEINS, SEAMS, FAULTS, CRVSNED TONES
_i
..J
WATER PRESSURE TESTLOOS .., Owns per munute pa tool
.51;tkfly
Wit•-111 e, caltY1 ET A -
aREY LA/F1C-4(E
0 _
•. 41 .
"Is.
I Pill$ 04E
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o.4•4...., cl.',4.,,,,,,..ad..•es^04:e co"--tp•
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4e.td; ^9—
DRILL TYRE^ON." RI TN;11NOTES
TRACTURE LOG - Nue*., of fractures ow toot of ow* ZoNts of coo. on are Necked .
WOOING AND JOINT PLANES - Angles an measured r4rtiva to a atone 00m01 to tha cent atm
r
WATER PRESSURE TESTS
FEED ___.--aY-40-r0.ia-Ve* PACKER TYPE
SUPPLY LINECORE SARREL TYPE^1.•••:p i C.
VERTICAL SCALE_1:4^_;k ,....0.- .^-4,..be .
DANA ER^C.^rvto ...; 7_,. noar•s goran or• poops praaborosTaft 'actions orb ibalooTed otablitcony by (Pablaba,n OrNia
PHOTOGRAPH REFERENCE SYSTEMCOMMENCED^it4 . SE •fgcomPLETED--L-A . ..I-1.-i; 6 ALAo, ANO WHITE
LOGGED Br 7. C3 nay 6.-ecice.VERTICAL SCALE—.1....-F--410-: ---.
COLOUR
PROJECT^AJeldida.^:13k; yes,-^or9e^D CA vV1^5 i-i- e^No.^1. SOLE NO.
A R a 3
SHEET 3^OF 3
BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS^
LOCATION
FROM^ 45 .^DIRECTION 1350 043nc+:c-
GEOLOGICAL LOG OF DRILL HOLE^ANGLE^HORIZONTAL
R LCOORDINATES
TOE.^TYPEA^of ,Prf^UP^Wf •T HERING
DESCRWT ION
. THOLOGy, COLOUR. STRENGTH. RARONESS. ETC
opp.pwc
LOG
DEPTH8^RAC' Un
SIDE OF^LOGCORE
LIFTa^ STRUCTURES
% CORE^JOINTS, VEINS, SEAMS FAULTS, CRUSMED ZONESRECOVER
Pc --IwW.^ '
WATER PRESSURE TESTLoss ,r, gallons Der minute Pa ,^tool
.^..
51:904.
tve.askt•tai
METAcikeYIAMCk E
De..5C.,";12-ItiOn ctsafoot....
•P;ec.s.^: l'_ 2.6 "^.ono de_^:^g"
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DRILL TYPE^"14.1:110.3) NOTES
FRAC-LRE^LOU^Number of fractures per foot of core^Zones of co.. lose we 0 ,000.0 .n
BEDDING^ANC JOIN ,^PLANES - AnoIes ore Pleas,. relative to a Wane gormoi /o fn. cafe ma
.VERTICAL SCALE^1 " ^lo '___
WATER PRESSURE TESTS• NyckaL.I:cto 4PCKEP TYPE
CORE BARREL TYPE^i P".;1, le SUPPLY LINE —^ —
540/;+^ v....se,^-F.... be. VERTICAL SCALE
OF,LtER_____—_Or_r60,0a..______
CCmmENCED .^3;14 • 1:J6 CO...LET( 0 __ 1 a ^q . 6 4LODGED BY 3.. araybrooke
rpg.rts ;wen ate poops pressureslest section. ore ...pol•d 0 50e ,,IPPIIV Pe PR.'. ...PO
PHOTOGRAPH REFERENCE SYSTEM
el ACP^AND WHITE^.^- -^•^-^. -
• COLOUR^ _ _
— — — . • -^—
N
`; •^ ,
powacT^libE^PE^/non sweet Dam SITE.
MOLE NO.
RRG. 4.
SHEET ..../— OF
INGSEAU OF MINERAL RESOURCES,^toceTioe4GEOLOGY AND GEOPHYSICS
GEOLOGICAL^ ANGLE FROM^0 '^• TEL^41-^DIRECTION^/1r1.1/25.LOG OF DRILL HOLECOORDINATES^ R.L
ROCK TYPEN DEGREE^OF^*FATHERING
DESCR,PTION
, •THOLOGY, COLOUR, STRENGTH, HARDNESS, ETC
DEPTHa^RACTURE
SIZE OF^LOGCORE
LIFTa
% CORERECOVER
STRUCTURESJOINTS, VEINS, SEAMS, FAULTS, cRUSNED ZONES .- .1.
WATER PRESSURE TESTLOSS In gallons PLR IDIRu• PM' TOO.
NO CORE
66'goderately
weethe*Fed
PHYZZ/TE
ar.ren:*-4 grej• r fed Fe bandso Streak, ; mara ta ra cy a r,,,,"che.....n.sc^RAJ/ e,.re . '
------
-.Zs
-1----
-....
-- --s,---•
-... _....„..
---
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kIf
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-...^......
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di, -,ras
-3 .
lf0,^F: bead,
pare et•I this.
..„.
•
•
.
I^I
Flociareta^t° -
ofer.r. *Ly
vvea thawed
SZRTE
Bleck ,fairty hard, h*:„*Aly
vrr, e e drred 5 ['sec ; eee•s
chlatitc.c rha..4 ishill,'t. ..;
4'.7 'lacer raft- , clayey,
4,•g417 .aea thereat'.
..s
,..,rf
.... 1
I
rj"'Kir
rser g rrir
,70 : wee*, 4/3iry crush atone
70'1"- 7.3': Iliyhl.y frac tared
73" - it '.. fe.s*rly lietri , We!'fractured; Sonya, Fe
Seds ./"./73 ill • rre.frIrr streaks
7.5"-t•Vf": num ***** e,'..4
zorrs wh•te matat:at highly-..r..,..i, c layey, e le•veje .
pe•ner ,01, (6..sA ad a. sl,ck•es.dre
711': thin gaartz pee',
...----ge: Cleavage .--,*'.,' Ma err, re ey
weathetaal
"swh/re"
Parrli se _Trey /lye( ire^Z.
p.a.', ehtarlte al...I
CraeCeres; coareined
than • earn
welZ !teetered , bat cleavage
nor AS Watz ...,....ae./...• ,, , •C•he sea te.
.s.-.• Fe ',ands brace:area/ bysnralC Jetta faults (a.isasA
\\,•• eAr r • .c , Aare., r/s;.0 0 ,...r'.aledera ceLj
w•otear•d
SLR TE
rei la three
t4..ft ,ohyttire
intorde de
•
.
Black , week^elate
1; madatateel strong
te weak^......
-0?
---
9?'
gg•- ye': A 4:54 ey thearedr';\poi/sh•e. ee.j.•oe.e.
eiesealef;66•44"4i/rsg• fIea^eli.reveeleae^e.r^ir
a Je*,:aens.deac.
SOO': Creel-era satfae. ari'`teating of hanvata'te.
...........----/02:". bands dlp-rao''.
103'-,0‘.: Fa band.; Icamtteda Areee L'e red
/0.1“- / /3' : senora/Z.1. h:gati
"re e erred; c lel V 13e Syria ref
pre,,:‘,4rd • el..f.rea‘•.....;
Il4r.: beddini r/.7'.
"/13 '-/20': Fe bends apt. s"wide ., most(' fiaeeeece to
deda...i, soer, •
4.ted,..ei e4e to Fe eisooe,t.:e
*slant, ireesralar creeks.
see. eh ,, fear, a. p•OZ03".
/21'; 5094.1C 'Carle pArreioz
4 eer•ik ,e; •• S4 ' date,,aza....eareoebeds • •ce OtrAlg.
IL.: 2'cresh lane.
1Jvz4'.'heaval1raetaredpat.'s hada..*Cleaews.'d../,
/AS': be.4.4;vj le; cleavage-4r%
/.27.I,Cthyleies ehrtes orn'ser'atattdatae.:05 Fa aandr;Inavaaa•ne
seracasac Ar.r.'ly eheer.,4irrie.
Alf '-/44 °: sto.re 4.. vs' (7 "rerereerjMr 44 ,eoe :she ... e ...rii 44 e.re...aVery;eheat,‘We ezOaraie fitanes ,
,39,„ig'4.• • ssy•'$;••••• ma ,*.> c re,,,,zo/s.s (each ...PI).
41.- /4, V: See ee sa'a**Xat taaewte; armee Fe.doro,,,e, Ant
h0 cr vsh cones ..041inIrsaseva's-w. Fc. bends ebeato•a•ay-.7-) ; Ind://^efr ..t.e. r..t,
' eanteanzni goaree,ces'speare 6.eads .
illfed•Naety• ttrong phyllite^--^ ,4*
Weak^store^ ........ ,
_r--^re,Mode , . e eZy rli..4.9 ply & .,. te
------^zos-
.---111.144. , Wee.* /ea re -.....
-... re
-.....ea maderateey serer," —. ...._:" ,...
_.,,
---.^,--•
---- --.."
-._^....,
—.
--..
to aw•alr^--.^i-....^......
---^.-•---^
e'e- ----
I,, ar• Ar• re. e • ei .1 rr.43 _ ---
/26're, weak ,ohylt.'te^--
greaaish gray^F Pd 44 ,04,..e.r/29'>
^
Nee.* Jerre, norgeseare^ r.stren3t4^......
-.......-.._
re •101* --.
-....--
.__
.._....... .....
,-,Moderate fr
wearieted
XV,WL/7"F
Crean; a* 3 ,..9, z- red bandx; --- --
oeces....../(y 041VPirey re.e.6,47'-/4-.:„..._'^-----.
14' "'-' 7 '^re•Alsr *re ot.,...urg-7 -te Weak^/ -- --
-•.• 'a...re...are str...,(4^....."--...
--.........„ ■
---.-....
..."--../445': btecc.:ASedolsoltal9.4.yle,:te; it r f erre, the ere taea chirp:ie.
q0.,s--/.6.': Fe hands od,a,aet:e'dSrl••■tkr,paraltae the etaa'neLeaeaje (a",-24.9.
•Im.h Air It:e• f . breac• -.4-lan,/Patti eveart_y •449■'-/s.!'„ ea
sonve letow a j• 00 FA ilee.'re..
S•.'y e pre.er . eat/re:re
•:, firers- , a (5) Ire' , e.4.,.,
1.c^coo Pa e hees•t.'re .
•
Orli I. ry.E^AN tie:PR/GC NUTS
,RACTIJRE LOG^Number of f rociur es oar row of core^Lanes of core .ass are blacked ..1
REDOING^AND JOINT^Pt ONES - AntVes ore measured relo”v• .0 0 P.m* nOTRMI fa f ,,e Core as,.
s
WATER PRESSURE TESTS
, f E D .^ , C._./YYPR,'"e4 PACKER TYPE
SUPPLY LINECORE BARREL TYPE^riF,"-DJCP
VERTICAL SCALEJAE /r INA/kW raae
Mai EP^4 „picAoZ
COMIENCED^JZ -L.: di_
no,"T^
oven ore pauee Preeeurbeeel sections are onslicated probbeba.A by tAbelma le *NIP
PHOTOGRAPH REFERENCE SYSTEMCOMPLETED^Z4 '47
4 065E 0 Sy - — nt R,af...tif
vl Pt ICA1 SC:LE^/.2.1er. °.
BLACK ANO VOAYE
COLOUR
ANGLE FROM HORIZONTAL
BUREAU OF MINERAL RESOURCES,GEOLOGY AND GEOPHYSICS
GEOLOGICAL LOG OF DRILL HOLE # s""
ROCK TYPEI% DEGREE OF WEATHERING
COORDINATES
DESCRIPTION
LITHOLOZY, COLOUR, STRENGTH, HARDNESS, ETCSTRUCTURES
JOINTS, VEINS, SEAMS, FAULTS, CRUSNEO ZONES
OEVN^EAT IRE
^LIFT
SIZE OF^
LOG^
At. CORECORE^
RECOVER
Moder, tewe • ehehod
Pleyzz Ire
Roderieotei*vet her /Id
ShRfE
Moder•a.fetyivdrathera./
PNyz /PE
' 7o d,*r Co (.7 S r 0.15, • z ec,oe".•
r tie .ina..c•te..?
Zes4s 4reccei tad u fkreec./
,1 ,Save .
6-re.a.'ah _grey^repti'moavarat.lj strrv
mein ereeteres • Febands. 47j te-
ds' ert.e t a fie 4eLaaf.
ha41413lerd eem,ad • cratrAte Jones;
chi% • ra .e."4- .,41,1V't./76': rarez vaiw,
wa'th cetrle her). re te.
/7f
bands -Jr
191
•
': "Ves:
434:-/to'i ;
Mets'nsoar,
IRE 5.4.1ei4 o4oli eer_y3e..?
e ,aje J trf ,a1^r s/2 014i-hear • ses'ette44,*.eage.
h' Few th...n pa• re:^VI)a.•. e at-^91"sen • ea ay ile" 4.i
•7t,f be eo,pret Zore so la,- 47/740C CS, 101‘.106.43
e.e the ray•lar Jana's. 2"e4eve.'es Pi*.eh Zoie.
202-24f . hca.v...(j fractbred.
249 -•Vo': •
209': 2".c4e.r,t):4 zone.
St. then sleet co.A000.n air • twr e ...Per Z."
eheo,,.ta s4eoloi0.5 jrea Ars?17040- e•ora,r- jr,_y.aaka
Wrawca therecri
GREYWIWKE
Creeni•A - sr.".^,o•prI1Sh;
kgrao strong r•ejorAcke
sooae sea/ ,C•^4'44E.
&area^a , hematite,
coiloritt)
deseentin...sb•..1j^Se!Jr. 4 ..07 e'rai^ra rex veeivs,d4o
241 . : mach Pe sr:v.' as
220 -2ZI..• ors'e• orPeatered, Z-co•est Avows tit* •eAt'arieit,sZ.sok ens 4%.6.1.
^2231: "crash sane.
frevrart cAi,j. ogi.ai'o
t1i ; trrom sand Siva
t. jr*na V14,, 04.414.7.
4.4.c. Pa; preeilomihatItLy3,-It7 color .
233 .‘"-234 ..".: 44.aray Per.a.t.red;stick's...fie/est •e41.tirie,
^Z34 .: 2" heavily. fraeerred
4234 .- 231r , 46;),:a _grey233'1V-Zif reactor., a twartli
eq„Is^fair); 12. •CAIMOrte.0 ,
23q ° : m..€h^, dame/a...Y.4
243' 4..ezlih5 irrejaear,
24‘:^'meteshea, •e4 re • <44,ICA;
diorCrafsA zone; CIA",
4essAgVee,e4tprieir
Ls-0 . : re30- -
25-.1. :ImArts vein ,^-W.
2.fog .: $harp co. tiet4etwc.e CO4P141 • oriese,o,44.rsc booed.' 4.5
2Sig":3`bemeate't• P,a4;f4a.• 'Jima!! C4 v fil^1".' •
zarttlibibt
TypE ^PM.VD/V/44
FEED^HYRout ic CORE BARREL TYPE TR/P4F
SPA if 1KVNEO 1A/2M_
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PACKER T,Pf
SUPPLY t INC^.
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HOLE NO.RDE49IDE RIVER CORE DR715/TE4.440 PROJECT
LOCATION96REAU Or MINERAL RESOURCES,GEOLOGY AND GEOPHYSICS
GEOLOGICAL LOG OF DRILL HOLE DIRECTION ^/3$.•ANGLE FROM HORIZONTAL J-.COORDINATES ^ R L^
ssexs TopeB MEGA!! OP eiF A7 HERING
DESCRIPTION
tiOtOGY, COLOUR. STRENGTH, tORDPIESS. ETC
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LOG SIZE OF^LOS^% CORE^JOINTS, VEINS, SEAMS, FAULTS, CRUSPIED ZONES
^
CORE^RECOVERY '..;12
We i k 1.y
weatherme/
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END OF HOLE
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PRACTURE LOG^Number of frocfures per foot of core Zones of core loss are blocked in
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WATER PRESSURE TESTS
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SUPPLY MIE
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55 °^
DIRECTION 135 ° ela3.64;v„GEOLOGICAL LOG OF DRILL HOLE^ANGLE FROM HORIZONTAL
R L SHEET _L. OF ACOORDINATES
6^ E4RFF^OE^WEATHERINGDESCR■PTION
, .01101.76Y, COLOuR. STRENGTH, HARDNESS, T ICGRAPHnC
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CORE^RECOVER
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A R a 5
SHEET -2- OF --Els.
BUREAU OF MINERAL RESOURCES,^LOCATIONGEOLOGY AND GEOPHYSICS
ANGLE FROM HORIZONTAL^550^ DIRECTION 1350GEOLOGICAL LOG OF DRILL HOLE
COORDINATES^ R L
ROCK^T ', PEB DEGREE^Or^PEATVERING
OESCR,PT ION, , , HoLoG, coL.C,Lon. STRENGTH, HARDNESS, ETC
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SIZE Or^LOG^% CORE^JOINTS, VEINS. SEAMS, FAuLTS, ORuSHED ZONES
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BUREAU OF MINERAL RESOURCES, COCA TIONGEOLOGY AND GEOPHYSICS
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tRACTURE LOG^Numb., of fractures per foot of core^Zones Cl 000 100$ are Stacked in
BEDDING^AND JOINT PLANES – angles are .easurea relative to o pIane norm! to the core au..
WATER PRESSURE TESTSFEED^Hydn'Qsz_.. PACKER TYPE
CORE BARREL TYPE^T.-:p leSUPPLE LINE
l;1^:,..-.12.--^4,.. be.VERTICAL SCALE
DRILLER _C.,___Fron; A Nauss coven ore gouge pressuresTelt sections ore oulicated grophtcolly by teocied.on strops
PHOTOGRAPH REFERENCE SYSTEMCOMMENCED
COMPL E r ED _ _ _ ^_ _ _ _ _ _^.
LOGGED SY _1...0.-,,a7,ap_oksBLACK AND WHITE —^—
VERTICAL SCALE
COLOUR
PROJECT^A deta:cle^Ryer-^o^P^' O.^SI.--Fe^No- I. HOLE NO.
A R 6'
/^3SHEET -- OF -
BUREAU OF MINERAL RESOURCES, •LOCATIONGEOLOGY AND GEOPHYSICS
ANGLE FROM HORIZONTAL^5 00^ DIRECTION^ /15° 014 9. "44: 'GEOLOGICAL LOG OF DRILL HOLE
COORDINATES^ R L
ROCK TYPE5 DEGREE^OF^REATMERI G
DESCRIPTIONLITHOLOGY, COLOUR, STRENGTH, HARDNESS, ETC LOG
DEPTH^RAcaw^
LIFT
SIZE OF^LOG^PA, CORECORE^'COVER
.^STRUCTURES
JOINTS, vEINS, SEARS, FAULTS, CRuSMED ZONESWATER PRESSURE TEST
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FRACTURE LOG^Number of ',Worsts WV row of cars^Zonao of cots loss ars bloclael tn
D^A^'^ABEDDING^AN^JOINT^PLANES —^nglo, ore rneasura0 0.10110. to a pions norm°, to Ms tore a...
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PHOTOGRAPH REFERENCE SYSTEMOMMENCED
COMPLETED BLACK AND WHITE
^'3.^Br^b^INLODGED DO^.^evy^....* o^e-- —
VERTICAL SCALE^I" ■■•10'
COLOuR
PRoJEcT^Fleteta;ole-^P'.ivc"^Gave.^'Da.,^S;+e.^No. HOLE NO
A RC, 6
SHEET a.. OF
BUREAU OF MINERAL RESOURCES, LOCATIONGEOLOGY AND GEOPHYSICS
ANGLE FROM^ 500^ DIRECTION 135°^g ;
6HORIZONTALGEOLOGICAL LOG OF DRILL HOLER LCOORDINATES
ROI .^r r PTN 0, rreFF^OF^of •THERNG
DESCR Is , ION, '"Si OS!, Epeceo. STRENGTH. HARDNESS. F YE
ORAPRICr. 04
DEPTaSIZE 0
CORE
toI RAC - LORE^a
OG^Pfo CORE in
RECOVERY 3
sTioNEJosE $TIN'S,^ENS SEARS, EALH_ES, LROSHEO TUNES
Es
5WATER PRPSSURE TEST
Loss^, BoNons Get mr•Pute per^FOCI
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C.SL L “' PE^PI rJELES1 , ; IL PRESSURE TESTSWATER TEEDes^I' e_H^%-n.^1 --y_91 ,- --
•±,a-§
,RAC TURE LOG^Number al Nactures^tom or core^loses 0^Ion^1Roc■ouper^ co , .^a..^Io PACKER TYPE
LORE BARREL TYPE^7-, ;/Die, BEDO,NG^AND JOINT PLANES — Angus ore measured reIonve to 0 Mose norrnor to 'Se 004 asrt
SUPPLY LINE
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Erato•, Laren are aquae^pressure,I“t secOons are mdlooloa graphicaRy TO brateed 4, sou.
PHOTOGRAPH REFERENCE SYSTEM
BLACK AND WHITE __ _ _^_. _^_
..,ERT CAE^SCALE _f._
COLOUR^ _ _
N.
PROJECT^Ade-104e^River^Ge ,e3e^DeAvn • S;+e^No. 1. HOLE NO.
AR c 6
SHEET -3- OF -3—
BUREAU OF MINERAL RESOURCES,LOCATION
GEOLOGY AND GEOPHYSICS
GEOLOGICAL LOG OF DRILL HOLE^ANGLE FROM HORIZONTAL^5.0f,
DIRECTION 13 .5 • /405ne..4. ,
COORDINATES^ R L
ROC s TYPE9 DEGREE^OF^WEATHERING
DESCRIPTION
, i IL HOLOGY, COLOUR, STRENGTH, HARDNESS, ETC LOG
DEPTH^ LIFTe^RAC RAE^8
SIZE OF^LOG^PA, CORECORE^RECOVERY
•STRUCTURES
JOINTS, VEINS, SEAMS, FAULTS, CRUSHED ZONES5 ■-..'i
WATER PRESSURE TESTLOSS .a GOO. DRY .18.0. DV ,DOT
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DRILL T TPE^ry-li.,-.4=L tNOTES
' RAC TURE LOG^Rama. , et fractures om Too , RIO^•^Zan.s of cora Iesa aro Macaw] .11
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•
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WATER PRESSURE TESTSFEED _______Yy_o1.!;e-_______.CORE BARREL T YPE^1-8*IP Le.
PACKER TYPE
SUPPLY LINE_ sp.i.A^i ,..... c .,_^4.,,,b,
DRIL ,EFT _ a.. tvlon.:a..^_ _COMMENCE()
VERTICAL SCALE
Flaws gown ow gaup. prem...^ 1Test sections ars ondlco.0 graohlecolly by bleelgol.on Ono.
PHOTOGRAPH REFERENCE SYSTEMCOMPLETED _ .^- - --
LOGGED RI _ 7.LC r2.14. e_t_zwsLo 1,4_,e .BLACK AND *HITE
VERTICAL SCALE ____I''._.(12" ._^_
_
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A ir? C 7
SHEET^I^0^-J-
BUREAU OF MINERAL RESOURCES,^LOCAT IONGEOLOGY AND GEOPHYSICS
1ANGLE FROM HORIZONTAL^4.5 0^
DIRECTION I 35GEOLOGICAL^DRILLLOG OF^HOLECOORDINATES^ R L
goc•^TYPE5 OCWEEE^OF^o/E•TNIERING
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r RaCTURE LOG^Numb. of f , acturts as/ foot at core^Zones 0( COM loss ar• Woo, . •■■BEDDING^AND JOINT^PLANES^4,151 ore asmatosa •elaave Ia a alone awn.. to ISe ca/a mos
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PLATE 6.
ADELAIDE RIVER GORGE
DAM SITE No.l.
Composite Stratigraphic Column
of Quarry Site
Column of Quarry Site built up from outcrops
near Section Lines A-Band C-0 (see Plate 3 1
Many correlations between outcrops are inter-
pretative. Quarry Site is entirely within the
Noltenius Formation.
Phyllite
O 0 0
0 0 0
O 0 0
D 52 /48/237
Fine grained meta-greywocke
Medium grained meta-greywocke
Coarse grained meto-greywocke
Grit
Pebble conglomerate
Sharp boundary between beds
Gradational change within beds
Scalein
feet
S-li
cli
Composite^.Strotigraphic
Column
Remarks
o-
to -
20 -
30-
40-
50-
60-
70-
80 -
90-
100 -
120 -
140 -
160 -
i80-
200-
-
-
-
_
500-
_
_
-
-
400 -
_
-
480 -
Phyllite
VVVVV\AA/V~AA/VW
cleavedGreywacke
VVVV\AWA\./VVV\AA/VV\
i^ .1 .3-1,--bi:• • •
• •^•D•
Cleaved and friableat surface
V^0,,,,^0^000000^o
• .^.^•
o • o"6"0 O•^°
•
• .^.
Elsewhere
No o/c
29 feet of meta-greywocke
"c;O"O a Elsewhere 7-13 feet of gradeda 0 0^0 C; "a . 6 . a; a 1 conglomerate and grit
No o/c
_.^- ^...
No o/c-- ^-Eig.• I foot bedding
• No o/c
.........
.^•
B^...^...^i'i!i ^../?^.^.
Co^o
—_— —
_.7-------
No o/c
:•^:^'''' :•^•^- -- . ..... .•
• .^•^•^•
Cleaved and friable at surface
.^.
-:—.^r•.:,:.7•-.7:Highly micaceous,
- .^.^•cleaved and friable at surface
0^0ci000^006Ob00'
'.^•
-•''•••'-"*": Friable at surface
• .^.....•.•.•:•.•'
•.^.•
• ^.^.
.^.• •^.
90^b
.^.^.icrea- vv•d•av^•
• 0o^
.'0204,0**0* .tiVb-
ALA A.A.A.:a.:ptscaLa;
:_n_amAllicen.b.4.-Jr_0
• •^• Cleaved at surfaceA
\AAAA/NAAAANAA/VVVVVV■
Phyllite
Bureau of Mineral Resources, Geology end Geophysics. April 1967. ro accompany Record /967/120.
al„mem„Aim=
^
^=AI^Aron:. ^„amp ^d mow'y^ ud..
^ 111111`.%.': _
PLATE 7
ADELAIDE RIVER GORGE
PAKTERN OF FOLDING IN ENVIRONS OF SCHEME
CONTOURED POLAR DIAGRAM OF 610 BEDDING PLANE
MEASUREMENTS SHOWING THE GREAT CIRCLE AND POLE( plunge of fold axis : 34° on magnetic bearing 010°)
CONTOURS PER I% AREA
12% 10%MOMMOMSMO•M I
8% - NIBNMI 5% 3% 1 0/0
To accompany Record /967/120^ D52/A8/238