UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE...

38
UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY Logs of holes drilled in 1955 and 1956 by U.S. Geological Survey, a Dry Creek Basin area, Bull Canyon district, Montrose and San Miguel Counties, Colorado Open-file Report 1967 This report is preliminary and has not been edited or reviewed for conformity with U.S. Geological Survey standards.

Transcript of UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE...

Page 1: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY ... carbon and mudstone £n sandstone) ... Classification

UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY

Logs of holes drilled in 1955 and 1956 by U.S. Geological Survey,a

Dry Creek Basin area, Bull Canyon district, Montrose and

San Miguel Counties, Colorado

Open-file Report

1967

This report is preliminary and has not been edited or reviewed for conformity with U.S. Geological Survey standards.

Page 2: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY ... carbon and mudstone £n sandstone) ... Classification

Logs of holes drilled in 1955 &&<! 195& "by U.S. Geological Survey, Dry Creek Basin area, Bull Canyon district, Montrose and

San Miguel Counties, Colorado

In the period November 1955 to April 1956, inclusive, the U.S. Geological Survey drilled 18 holes in the southwest part of the Dry Creek drainage area, Montrose and San Miguel Counties, Colorado. The holes were drilled to evaluate the favorability of the Salt Wash Member of the Morrison Formation of Jurassic age as a host for uranium deposits. This work was part of a program of exploration conducted on behalf of the U.S. Atomic Energy Commission,

The factual results of this drilling are set'forth in the following items that accompany this note.

1* Lithologic logs of the holes

2. An explanation of abbreviations used in the logs

3- Index map 'ana* map''showing'location of the holes

\

Page 3: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY ... carbon and mudstone £n sandstone) ... Classification

ABBREVIATIONS FOR GEOLOGIC AND ASSAY LOGS

Rock name

CG - conglomerate or conglomeratic SS - sandstone MS - mudstone ST - siltstone CS - claystone LS - limestone .CH - chert or cherty

Color description

Wh - white Br - "brown R - red Gy - gray Bl - blue Gn - green Tw - yellow

Bk - "black Pp - purple L - light D - dark

Grain sizes

Wentworth scale (modified)

VP - very fineF -"fineMP - medium fineM mediumMS - medium coarseC - coarseVC - very coarse

Relative abundance(use nnly' foy

Millimeters

0.060 0.1250.210 0.300o.teo0.600

- 0.125 - 0.216- 0.300 - OA20 - 0.600- 1.000

carbon and mudstone £n sandstone)

S ~ sparse A - abundant

1»000 - 2.000'

* Chemical abbreviationsCbn_- carbon

For all other elements use the standard chemical symbols, Cu for copper, Fe for iron, Mh for manga­ nese, etc.

_ : Classification of mudstone in sandstone

P * pebbles, round or angular fragments of pebble size (more than- \ mi or 0.15 in»). . . >

G - granules (less than k mm or 0:15 in., and more than 2 mm or 0.08 in.) Fk - flakes, paper thin, with two longer dimensions. 8m - seams, less than 0.1 ft. thicl?.Fin - films, usually along lamination or cross-lamination planes. Int- interstitial. ----.-. ' =

Miscellaneous abbreviations

1. fav - favorable2. semifav - semifavorable3. unfav - unfavorablek. alt - altered5. Bby - Barnaby6. earn - caraotite7» Cond - condense or condensed8.*. disc .- .discard, or .discarded&' '". <"» »/»' l* i'-^T»»<i»'t!iyi*i» « '"' ". . " '.'. "'* ''*. . *

12. 31,Tn - limonite13. mot - mottled1^. OBSS - ore-bearing sandstone15. op - opaques or opaque16. qtzc - quartzitic17. H - high )18. L - low ) use only for19r . $r. - trace).. .......

Page 4: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY ... carbon and mudstone £n sandstone) ... Classification

ABBREVIATIONS FOR GEOLOGIC AND ASSAY LOGS Continued

Symbols for stratigraphic units

Kbc - Burro Canyon FormationJob - Brushy Basin Member of the Morrison FormationJms - Salt Wash Member of the Morrison FormationJmr - Recapture Member of the Morrison FormationJs - Summerville FormationJe - Entrada Sandstone

Page 5: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY ... carbon and mudstone £n sandstone) ... Classification

.V: *-.5:v

Additional Informat-icn for Claim Owners

The additional information contained in this supplement is useful in interpreting the GEOLOGIC AND ASSAY LOGS form.

Collar elevation 0 Generally this is the elevation above mean-sea level of the drill-hole coliaro The elevation in the space before T is temporary, that in the space before P is permanent o Permanent elevations are determined by plane-table methods; temporary eleva­ tions are determined by less accurate means.

Summary of log.r-Each of the terms "favorable." "semifavorable," or "unfavorable" sums up the geologic factors that determine whether or not the hole is in ground considered favorable for the presence of ore. For instance, the term 'iff avorable" indicates that 'the hole is in ground that shows most of the criteria that are present near ore deposits, A "favorable 31 hole is not necessarily one that is in mineralized rock. . .

Core recoveryo-- This is noted only where it is less than 80 percent. Poor recovery may mean that the log presents an incomplete geologic record of the unit of low recovery-

Field estimateoWThe column headed "11303 lr gives the uranium oxide values based on visual estimates and portable geiger-counter read­ ings made by the field geologist. The column headed "V^s" gives vanadium oxide values based on visual estimates made by tne field geologist.

Assays. -The values given in the columns headed *T*ab assay (%}* are chemical assays, with the exception of those preceded by Ren . Chem­ ical assays for uranium are determined only for those samples that register 0.01$ percent or more etJ^Og^ Values preceded by ^e11 are determined by a laboratory gamma-ray scanner? they represent equiva­ lent tljOg values of rock samples sent in from, the field. Gamma-ray

. values determined in the laboratory are generally more accurate than field estimates.

-. In the column headed "v-ray^ ^eUjOg." the values given are determined from a ganma-ray field log, obtained by logging the drill hole with a geiger-counter probe. Gamma-ray values are given only for samples that register 0.010 percent or more

y-ray logo The column headed V-ray log" contains no information of use to the claim owner or lessee.

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Page 14: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY ... carbon and mudstone £n sandstone) ... Classification

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Page 37: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY ... carbon and mudstone £n sandstone) ... Classification

>T X X* S) ^ 1^^. \ -vv'%£xr^ jy\ 4 0 *x\r '' ^ v °>/X

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ApproxiMt* boundary ofUravair »iner%l

LOCATION OF FIOURE 2

EXPLANATION

BOttKOAftY OP BULL CANYOtt DISTRICT

1 0 9 MILES

FIGURE 1. INDEX MAP OF PART OF BULL CANYON DISTRICT, SHOWING AREA DRILLED ON THE THIRD MONOGRAM MESA DRILLING CONTRACT, MONTROSE AND SAN MIGUEL COUNTIES, COLO.

^-. ^^i^^^^^^^^y^^^-

Page 38: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL · PDF fileUNITED STATES DEPARTMENT OF THE INTERIOR GEOLCGICAL SURVEY ... carbon and mudstone £n sandstone) ... Classification

DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY

OPEN FILE 1967

BOimOMV OF FAVMAILE. Stm FAVOCAM.E . U«FAVO«ABLE GftOUIID IMDEM.AI* IT

O*E-IE*fll«6 SAIOSrOIIE

LAUD SECTIO* UUIE*. LUG LIKES MOTOPOGRAPHY ftO* U.S. GCDLOCICM. SURVEY QUADBADCLl «4P, GYPSUM GAP

OUHOHD-DAILI. HOLES, GEOLOGICAL SUIVEY, 1953-511,CLASSiriCATio* ev GRAIE (BASED on GAMUA-RAV

DATA OF DOUBTFUL RELIABILITY AND CHEMICAL ASSAY) AHO THICK«ESS. DRILL HOLES LOCATED BY TKAliSIT Alio STADIA SU5VEY METHODS. KUVSEKS Ck D« ILL-HOLE STAIID-

fl»CS III FIELD H»VC PREF1I MM

»j I.H. (Hll

i*rvmji»m *jr C- urcn^r

Figur«2. MAP OF DRY CREEK BASfN DRILLING AREA, BULL CANYON DISTRICT, SAN HIGU L COUNTV. COLO

Survey standard!