COMMONWEALTH OF AUSTRALIA

DEPARTMENT OF NATIONAL DEVELOPMENT

BUREAU OF MINERAL RESOURCES GEOLOGY AND GEOPHYSICS

RECORDS:

1948/43

SECOND PROGRESS REPORT ON GEOPHYSI CAL SURVEY OF COBAR 1'1INING FIELD. N. S. W •

by

L.A. RICHARDSON

The information contained in this report has been obtained by the Department 0{ National Development, as part of the policy of the Common­wealth Government, to assist in the exploration and development of mineral resources. It may not be published in any fonn or used in a company prospeetus without the permission in writing of the Director, Bureau of . Mineral Resources, Geology and Geophysics.

5928/65

COMMONWEALTH OF AUS THALIA

DEPARTMENT OF SUPPLY AND DEVELOPMENT

BUREAU OF MIlmRAL RESOURCES, GEOLOGY AND GEOPHYSICS

REPORT NO. 1948/43

( GEOPHYSI CAL REPORT NO. 1948/5)

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J-.#CON'J?, PROGRESS REPORT

ON

GEOPHYSICAL SURVEY

OF COBAR MINING FIELD, N.S.W.

BY

L. A. RICHARDSON

SUPERINTENDING GEOPHYSICIST

BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS

CeBAR GEOPHYSICAL SURVEY

2ND PROGRESS REPORT

I. INTRODUOTION AND HISTORY OF OPERATIONS

This progress report brlef'ly describes the developments ot chief interest in the Cobar geophysical surve7 up to 4th June, 1948. .

Discussions between officers of' the' 'Geological ,and Geophysical sections of the Bureau late 1n 1946, led to the commence­ment of geoPhysical survey operations by the Bureau at Cobar 1n Karch, 194r7. A magnet1c survey of the New Cobar, Chesney, Dapville and Gladstone areas "as conducted by L.A. Richardson and .VW';D. KeatIng. The results of' these operatIons are given 1n Report NO. 194?/60 dated November, 1947. .

The magnetIc survey was resumed 1n November, 1947.# under the Bureau's supervision and 1n association w1th the Zinc Corporat1on Ltd., field geophys1cal operations be1ng conducted b,. W.D-. Keating of the Bureau as Party Leader and J.J. OOsthuizen ot the Zinc Corporation ttd. Tbe pegg1ng of traverses and other surveying operatIons were conduoted by the Company.. Geologica~ surveys were oommenced by the Company 1 s geological staft and the results of these were i ava1lable for the geophys1cists to supple­ment the prev10us and current geological work of the Bureau and the N.S.W. Mines Department.

The first object1ves of the geophysical operations were to extend the earlier surveys northerl'1 to include the Great CObal' and Thars1s areas, 10 round ott and extend the area covered by the earl1er surveys and to then extend northerly to the G.S.A. and southerly to the Peak Area.

In Deoember, 1947, the Company commenced diamond drilling on the Dapv111e area to test the DapvIl1e ·No. 1 magnetic anomaly described 1n the report or November, 1947.

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In January, 1948, the area was vIsited by the writer and the results were examined. Test surveys were made on the Peak area whioh' gave interesting results, and plans were,made for this area to rece1ve immed1ate attent1on. C.J. SullIvan superin­tend1ng Geologist of the Bureau had previousl,. expressed special interest in the Peak area due to the ex1stence of a bend 1n the sandstone - slate contact whicb, was believed to be of importance in connection wIth mineralisation control.

The magnetic surveyor this area, completed by W.D. Keating, showed the existence of a pronounced magnetic anomaly and a self potential survey of the area ot the anomaly showed features of interest. Later a gravity survey was made over the anomaly area by J.C. Dooley of the Bureau and the S.P. survey was extended by G.F. Schaetler ot the Bureau.

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The field was again v1sited by the writer 1n April, 1948, when Mr. Haddon King and Mr. Sullivan were also present. The NO. 1 D.D. hole had just prev10usly 1ntersected a pyrrhotite -Chalcopyrite body of thickness.about 3'6" at a vertical depth ot 840 teet below the centre of the Dapvl1le No. 1 magnet1c anomaly. Further particulars are g1venlater in this 'report.

The survey at that time had extended well to the north towards the O.S.A., this part, from the v1cinity of Fort Bourke. area, having been completed by J.J. Oosthu1zen. An anomaly of

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interest was present north of the spotted Leopard shatt and other features of possible interest were apparent.

Oncompletlon of the gravIty survey of the Peak area two gravity test traverses were .srrrveyed on tbe Great Cobar llor:th area. It was tnen necessary for Mr~ Dooley to retur~ to Melbourne with tbe Grav1meter to prepare for acontlnuatlonot gravity surveys elsewhere.' Messrs Dooley and schaefler retu.rned to Melbourne ,on 15th April,.havlng spent four weeks on the field. Mr. Keating , returned to Cabal' on 14th April, and W.A.L. Forsyth ot the Zinc Corporation Ltd., joined, the Cobar party on the s~e day. .

DurIng the April visit to Cobar general a.spects of the survey and dril11ng results were discussed w1th Messrs. lUng and Sullivan. SOl'Jle details of the drilling results are given 'late.r in this report. Following these discussions arrangements "ere made tor -

1. Additional S.P .. ,surveys at the Peak area.

2.. More detailed magnetic and ~S.P. surveys on the Great Cobar north area.

3. Detailed magnetic and SjP. surveys on the O.S.A. mIne area.

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4. Continuation of the O.S.A .... Spotted Leopard survey.

s. Deta1~ed magnetIc .survey of the Dapville No.2 anomaly area.

A seoond drilling plant was sent to the 1'leld bl the Zinc Oorporation Ltd. early in May and the ComPanJ asked r,or details of' aeite for d.tll11ng to 'test the Peak survey results. Arrange­ments were made tor this question to be discussed at Cobar with the geologists concerned, before'making a decIsion. This was done on 2nd and 3rd June with Mr. King; Mr. Sullivan not being available. Particulars are given later in this report. :

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During this vIsit to Cobar;. plans were made for the survey to be extended in due course, to the area innnediately south of the New Occidental and to the "Leslie" occurrence.

1. Dapville Area.

some details of the-drilling results in No. ~Hole are givenbelO1l:-

Depth -. Copper Gold --988 ... 992 t 6" '0.13% N!l

1032-1035 0.90 Trace 1035-1040 0.10 0.02 Of: 1040-1045 O~45 Trace 1045-1050 O~75 0.02 oz 1060-1055 0.15 Trace 1055-1060 1.30 0.02 oz ' 1060-1065 4.5 0.10 oz : 1063-1065 4.6 0.02 oz,

The material at 1060'-1065 t was massive pyrrhotite. (of true width 3 t 6") at a vertioal depth of 840 feet below the centre ot the Dapville No. 1 magnetic anomaly. ~bese drIlling results were interpreted as of conslder@ble importance because they tend to confirm the belief that magnetIc anomalies on the

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Gobar tle~cl are 11kely to be well worth drilling. Furthermore it 1& important to· recognise that the nature of the Dapvllle No.· ~ . anomaly body. where kno1'lll, 1s massive pyrrhotite and produced ananomal,. of about 30 ge.mma.s only at the surface. An ore-body of' similar. dimensions and depth,. 'but w1th less pyrrhotIte, tTould produce an anomaly correspondingly smaller and It can therefore be conclilded that magnetJ.e anomalies of even sm.all intensity than that of Dapvl11e No. 1 anomaly may be regarded as important. The .speculat1on can be carried further to support the view ex­pressed in the report of' November, 1947, that the a.bsence of magnetic anomalies lleed not be regarded as adversely affectillg pro.specting of' localities which may be conslderedf'avourable on geological or other grounds. '

The geophysioal aspects we.re mentioned durIng discussions atCobar and in connection w1 th the selection of &. site for No. 2 drill hole, Mr. K1ng expressed interest in the Dapvl11eNo. 2 anomaly area as a. target tor that hole. This was not .favourably consldered by the l1l'iter tor the reasons given below. it being understood that Mr. King had specIal reasons from the m1ning operational. side influencing his views on the matter.

a. 'l'he form of the Dapvll.le No.2 anomaly as it stood was very irregular and needed further examlnat1o~ before a decision could be satisfactorily made ooncerning testing by drilling.

b. The area of this anomaly was covered by overburden so that vehad no evidence of the exlstenoe of any favoura.bl.e sur.face man1:te.stationsof' m1n&ralisation as \Vas the case wi th the Dapvl1le No. 1 enomal,..

c. For general requirements in connection nth future del1berations concerning the interpretation of our magnetic results at Cobar, an intersect10nof the Dapville .No.1 anomaly body, In 1ts centre •. and at a shallower deptli than 840' would be useful.

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These pOints were discussed at the t1me .and to take care of the aspect (b) above, Mr.· King putforVlard the proposal to undertake trenching of the anomaly area to search forall7 mineralisation signs 1n the solid bedrock. ~. Keatingw9.s there­upon asked to give the location necessary tor such trench1ng. Further dec1sions on the matter were deferred because Mr. King desired to d1scuss the question v1th others concerned.

subsequent cogitation On the subject by the WrIter led to the memo da.ted 23rd April and addressed to Mr. Keating. In this memo it was ind1cated tha~ in view of the interest being shoTln in the Dapvil1eNo. 2 anomaly it was desirable that we have the opportunity of giving that area some .further attent10n before being asked to select a slte tor a drill hole to test this anomaly. In the event of the final decis10n being 1n favour or placing No. 2 drill on No. 1 anomaly a site was recommended as belot7.

At 1400N/ 27700 de .. pressed 60° in the d1rect1on 2600

(true) to 1ntersect the anomaly ax1s at a dept~ ot ~ about 450 feet.

In due course further attention 'Was given to the area of No. 2 anomaly add the results are to hand. This Tlork consIsts ofa deta1led magnetIC survey of a number or traverses by Mr. Ke~tlng and some, 8.1'. traverses by Mr .• Forsyth. The magnetiC prQfile& show the existence of very disturbed cond1 tions of· shalloTl seated orIgin and. the possIble presence of' an anomaly ot about 30 gammas wh1cn 1s more or less similar 1n type to the Dapville No. 1 anomaly. It 1s centred at about 2900N/30~~. The defin1t1on 1s very uncertain. 'llle B.l'. Survey gave no anomaly.

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No. 2 dX'ill hole was eventually pla.ced' -by the Company on the DapvI11e No. rr/anomaly at l250N/278OW, depressed 66°, 1n the direetlon 2750 [true}. This \Till 'te~t# at a 'posl tion about 200 t'eet southerly from the anomaly centre. at a depth ot about 450 feet.

2~ 'The Peak Area.

The magnetic survey of the Feak area~ b1 Mr. Keating, revealed the presence of a magnetic anomaly of intensity 450 gammas, of deep-seated origin and centred at 200N/l200E. The form ot the anomaly Is shown by means ot lsodynamlc lines on plan No. G28-l.

It will be noticed that the anomaly 1s centred on the southerl,. continuat10n of the Blue Lode Shear 11ne and'is close to the bend 1n the sandstone-slate contact as deter-mlned by O.J. sullivan. Th1s bend 1s believed by Mr. sullivan to be a geolo­gical t'eature of significance 1n connection with mineralisation.

There is room tor speculation concerning thetyP8 of body reaponsible tor this anomaly and to seek further evidence concerning its nature, arrangements "ere made for selt-potential and gra.vity surveys to be made over the anomaly area. The s.P. survey was commenced by Mr. Keating and showed anomalies of interest. During Mr. Keatlngfs Bubsequen.t absence from the field onrecrea­tion leave. a gravity survey ot' the area was made by J.D. Dooley ot the Sureau while the S.P. survey was continued by G.F. schaefler of the Bureau and later by W.A.L. Forsyth of the Zinc -Corporation Ltd. The result of these gravity and. S.P. 'surveys are shoTm on plans numbered G28-3 and G2B-2 respectIvely.

It will be seen that each method ot survey shows an anomaly but they do not coinCide in poslt1on. Consequently there is no mutual confirmation and each anomaly has to be conElldered separately and on its own mer1ts.

The ma,netic anomaly is considered to be well situated trom the geologica~ vIewpoInt In view of 1ts relation to the Blue Lode Shear and the bend in the sand&tone-slate contact. It 1s no doubt due to a magnetic body ot substantial dImensions ~ith an elongation parallel to the Blue Lode Shear Line. A clue as to its nature may be provided by the results of 'tests made on the drill core from the Peak Drill Holes 2 and 3. These show that the bottom 45' of No.3 and the bottom 2'75 t of No.2 drill hole interseoted lightly mineralised slate with appreoiable m,Qgnet­isation. Mlneragraphlc examination of specimens from these sections by Dr. Stillwell Shows that the magnet1sat10n 1s due to pyrrhotite, mostly along cleavage planes. V'I1thln these sect10ns heaviest mineralisation of usetul kind. is found 1n shear zones, or the 11ke, of width about 5 feet or less. The Whole or most of the pyrrhotito zone Is lightly mineralised v1th copper and lead.

The body intersected by the NOS. 2 and 3 drill holes gave no appreciable magnetIc anomaly at the surface and 1£ sImilar material is respons1ble for the Peak magnet1c anomaly it Is likely that the magnetic mineralisation of this body will be more intense than that ot the body intersected by No. 2 and No. 3drlll holes, vith the prObability-of magnet1te also being present. Further­more' 1f the most useful mineralisation 1s to be found in shear zones within this body, attention is drawn to the Blue Lode Shear as the feature likely to be concerned w1th t~s aspect. The shoots ot ore co~ected with this shear in the Blue Lode workIngs Showed a steep easterly d1p. The form or tbe anomaly suggests that tho anomaly body has a steep westerly dIp. In testing this anomaly it is therefore not clear whether it would be best to drill from the east side or the west. From the stra1ghtout geoPhysical point ot view it would be satisfactory to drill vert1cally at the centre of the anomaly body to prove its depth and determine its nature in the centre of its mass dlstribution.

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, ,'The .foregoIng remarks apply a's 'lnteI'pretatlon aspects 1.f the anoIjlS.ly 1s due to a mineralised body of the Cobal" type. It should be recognised that the anomaly could be due'to a basement or other'geological feature. However, ~e know nothing about the depth to or naturao! the basem.ent in this area~ or otthe existence of any other unmineralised geolog1oal feature which could cause thls,anomal,y.

J, ee The S.p; anOmalt axis lies along oi' close to the positlon,ot the Blue LoGe S ear'With one pronounced negative centre at the 'southern end and less definite ones to the north. The form of the southern negative eentr~ 1s sueh that the souree'o:! ,potent1e.l'respons~Ole' could be a sulphide body undergoing oxi­dation at 'a 1epth 01.' 200-300 teet which 1s the depth of ,oxidation

_ on the Peak area.' , . ,

it 1s also: a fact that the. anomaly is 'conf'1ned to the : hill reatu.re,though' the correlat1on 1'rith ,this .feature 1s no't

cons1stent In detail •• There have been instances when S.P. anomalies have been measurea and attributed to specIal earth-current d1s­tr1but1ons related to hill reatures. This could be the oase with this anomaly but its tor.m and COincidence in positlon ~ltb the Blue Lode Shear are strong factors 1n favour or lt being regarded as a feature related to mineralisatIon dlstribution. , , ,

The gravity anomaly lss. broad feature, measured only in part t.o da.ta, but its centre' d.oes not eorrela te well with known geolog1cal features of interest. Furthermore its dimensions are such that a m1neralised body ot the type lIkely to occur at the Peak area would have ,to exh1b1t unusually large dimens10ns to produce the anomaly measured.

Reviewing the anom,alies obtained from the three methods the writer favours testing of the magnetic anomaly first and then the S.P. anomaly; leaving the gravitY' one for later consideration.

Some aspects of interest in connectIon with. the magnetic anomaly are set out beloTJ -

a. The absence of S.P. allomaly over the central area of the magnetiC anomaly may be judged as evidenoe unfavourQble f,or the existence of heavy sulPhide mineralisation 1n the magnetIc anomaly body. 'lbis absenoe would be accounted for 1f any such sulphide body present does not extend upwards into the oxi­dation zone ..

b. The absence of obvious mineralisat10n Indlcatl~ns at the surface over the central area of the magnet1c anomaly was not regarded as unfavourable evidence because the anomaly body may not extend sQff1clently close to the surface to prov1de such obvious ind1cations. It was believed that the Blue Lode mineralisation may be one sUl"'face manifestation which would extend dovn its southerly pitch to the 'VIcinity at: the anomaly body and thus be related to the latter., .

c. In this connection 1t is understood that recently off1cers of the Bureau's Geolog1cal SflJction hp.ve made a detailed examination of the area and have found psuedo.morphs of sulphide 1n the surface rocks over the central area of the ·anomaly. Further deta11s are Q\7altod.

d. It 1s believed that in spite ot any unusual or odd aspects wh1ch might apply to this anomaly body Tie have ample justification for assuming at this stage that the magnetic anomaly alone prov1des a worth while target for drilling.

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Early in May the Zinc CorporatIon Ltd •• notified that another drIll1ng plant wou~d reach the f1eld on 26th May tor

"'d.rI11ing the Peak area and sought partIculars of a dr111 site. Due to the~exlstenoe ot the varlous tactors mentioned above., arr.angements Vlere made tor this questlop to be investigated at . Cobar with the geo1og1stsconcerned before making a decisIon. This invest1gation took place on June 2nd, and 1t· wa~ agreed that thetlrst hole should be drilled trom the east side at 180N/1510E depressed 65° 1n the directIon ot traverse l80N, westerly, to 1ntersect the anomaly centre at a depth of about 500 feet.

When the time" arr1ves for testIng the f).F. anomaly we mar be 1n possession ·ot sUb-surfaoe data obtained trom the testing ot the magnetIc anomaly which will influence the decis10n conoerning the S.P. anomaly. In the absenoe of any such addIt­ional 1nformation 1t is recommended that the Initial testlng ot this anomaly be by drilling des1gned to intersect the a noma 17 axls at a vertical depth of about 350 feet at the point 1000N/1000E.

~.1heGreat Cober Area.

The operating Company Is interested 1n an sariJ determination of the poss1bIlities on the Great Cobar group of leases.

To date a detailed magnet1c survey by Mr. Keating and a "S:' .F. survey by Mr. Forsyth ha.s been made over the area extending northerly-from the Great Cobar le ase to the part just north ot the railway llne.

In addit1on, gravity measurements have been made by Mr. Dooley along two traverses on the Great Cobar north area. Geophysical operations over this ground are serIously hampered bJ the presence of slag. iron debr1s and houses, whIch of COU~8e mostly effect the magnetIC sUI'veys. Plan 028-4 shovs the results ot th9 magnetIC survey In the torm of 1sodrnam1c lines which are based on smoothed protiles.

"There 1s astrollgmagnetlcanomaly assocIated with the Great cobar oocurrenoe which cannot be com.pletely measured due to the existence or the slag dump. The material responsible is no doubt. related to the Great OObar tore-body occurrence and probably does not exten6 far 1f at all info the Great Cobar North lease. However, it 1s possible that material of lesser magnetisation extends into the latter lease producing a small anomaly 'Which cannot be satisfactorily separate'd from the anomaly due to ttl. Great Cobar occurrence. The position is made worse by the fact that the magnetIc protiles concerned are very d1sturbed by the effects ot houses and debris. It 1s considered therefore that themagnetlc results on th1s area are inconclus1ve •.

The"results of the S.P. survey to date show no anomalies of interest on traverses 6400N to 7800N. AddIt10nal S.P. t70rk is beIng carried out., However, the prospectso! obtairting usef'ul results .from this method on the Great Cobal' North area are not promising and wl~l prObably be inconclusive also.

, The gravl ty test survey by Mr. Dooley was made on traverses ?500N and 8200N. In eaoh case anomalies ot 10\1 intensIty are present, centred at about 400OW, which could be due to mineralised zones.

On thebasls of results to date on this area 1t is considered that the geophys1cal survey results are not conclusive enough tor the purposes ot making a satisfactory drilling rocorilmend­ation. , .

It practicable we would apprec1ate some not1ce of tne intention to dr11l th1s area, to g1ve t~e tor ~ close enam1nat1on

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or the results when they are all to hand. so that whatever we can get out or them w1ll be available for the guidance of test1ng. ~h1s examInation would be facilitated 1f at the time, a copy Was available of the Company's recent compilatIon. from old recol'ds showing sub-surface mineralisation distribution 1n the Great Cobar and Great Cobar North workings.

. It Is believed that there is scope for further gravitY" work on this area and the use of' electromagnetic methods which mal detect the positIon of shear zones ot Interest,

4. C.S.A. -spotted Leopard Area.

Plan Wo. G28-5;shoYS smoothed vertical force isodynamic 11nes based on part of the ~'rleld observations made bl J.J. Oosthulzen of the Zinc Corporation Ltd. It 1s clear from these results that an anomaly (Spotted Leopard 'No.1) ot intens1tY" 70 gammas and deep­seated origin is centred at A 12000W!200cm. 'lhls position 1s about 2 miles southerly from the O.S.A. Mine and 1s on or near the extension of the O.S.A. Tinto mineralisation 11ne~

AS in theaase ot the Peak anomaly" this anomaly could be due toa geological .feature other than ~ mineralised body.' It a mineralised body 1s responsible, its dimensions will probably be substant1al but its main mass may not extend upwards tar,. it at all. into the oxidation zone,

It was reconnnended that i;nitial testing by dr1l1ing be designed to intersect the anomalY9.Xis at a depth ot 800 .feet. Accordingly a drill site was .fixed at A ~l860N/l56OW for a hole depressed 65 in th~ direction of A 1200,Q,N/800OVW.

Other anomaly features of interest are present 1n Mr. Oosthulzents work south ot the Spotted Leopardshatt. These "iil be described when the results of recent field work have been examined.

On the C.S.A. Mine area the detaIled.magnetic survey by ~. Keating has revealed an anomaly ot interest centred near the known occurrence. A self-potent1al survey is to be made over this area and reeul ts trom both surveys w111 be described la·ter.

III. CONOLUSIONS

Reslflts to date from Cobar Geophysical Survey show promise ot making a useful contrIbutIon to the knowledge of the mineralisation distribution on that f1eld.

Seven magnetIc anomalies of definite interest have been located. These are. New Cobar. Chesney, Dapvll1e No.1. Peak, Great ¥obar, Spotted Leopard NO. 1. and the O.S.A. Mine. 'lbe discovery ot massive pyrrhotIte in the mineralisation re$ponsible for the Dapville No. 1 anomaly has an important bearing on geophy­~dcal interpretation procedure beca.use a number of other magnetic anomalies of low 1ntensity become of interest. These will be selected :from the results 1n due course and are addit10nal to the ones mentioned above.

PlottIng of the restilts by Mr. Schaefler, to suIt geophysical requirements, Is proceeding in this otflce and 1s well advanced. It 1s recommended that gravimeter surveys be commenced at an early date on the area o:f ths Spotted Leopard No. 1 anomaly and the Great Cobar Area. <,

Melbourne ' Jury 9th,·1948.

(L. A. RICHARDSON) superln£end1ng GeophYsicist.

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