GEOLOGICAL SURVEY CIRCULAR 590 

Potential for Lode Deposits in 

the Livengood Gold Placer District 

East-Central Alaska 

Potential for lode Deposits in 

the livengood Gold Placer District 

East-Central Alaska 

By R. L. Foster 

G E 0 L 0 G I C A L S U R V E Y C I R C U L A R 590 

Washington 1968 
United States Department of the Interior 

WALTER J. HICKEL, Secretory 

Geological Survey 

William T. Pecora, Director 

Fint printing 1968 

Second printing 1969 

Free on opplicotion fo the U.S. Geological Survey, Washington, D.C. 20242 
Abstract - - - - - - - - - - - - - - - - - - -

Introduction - - - - - - - - - - - - - - - - -

Geologic environment - - - - - - - - - - - -

Economic geology - - - - - - - - - - - - - -

Lode deposits - - - - - - - - - - - - - - -

CONTENTS 

Page 

1 Economic geology-Continued 

1 Geochemical investjgations- - - - - - - -

1 Conclusions and recommendations - - - - -

2 References cited- - - - - - - - - - - - - - -

2 

ILLUSTRATIONS 

Figure 1. Generalized geologic map and sections of the Livengood district - - - - - - - - - - - - -

2. Map showing distribution of gold lode prospects and productive gold placer deposits- - -

3. Map of Livengood district showing location of stream- and spring-sediment samples 

and anomalous metal concentrations - - - - - - - - - - - - - - - - - - - - - - - - - - -

4. Diagrammatic geo1ogic cross sections of the Ruth Creek area (C-C' in fig. 1), 

showing alternative structural int.erpretations- - - - - - - - - - - - - - - - - - - - - -

TABLES 

Table 1. Semiquantitative spectrographic analyses, and other analyses for gold and mercury. 

Page 

2 

3 

3 

Page 

14 

16 

17 

18 

Page 

of stream- and spring-sediment samples - - - - - - -- - - - - - - - - - - - - - - - - - - 6 

2. Semiquantitative spectrographic analyses and gold analyses from lode prospects - - - - - lO 

3. Semiquantitative spectrographic analyses and gold analyses of rocks - - - - - - - - - - - 12 

Ill 

Potential for lode Deposits in the livengood Gold Placer District 

East-Central Alaska 

By R. L. Foster 

Abstract 

The Livengood gold placer district of east-central Alaska contains small bedrock deposits that probably were the source of the 

placer gold. Stream sediments in parts of the district, particularly 

in the Ruth Creek drainage, are characterized by abnormally high 

concentrations of gold, arsenic, mercury, antimony, molybdenum, 

and silver, and Ruth Creek itself is characterized by highly acid 

water. The area is complex geologically and is cut by many thrust 

faults, some of which have been invaded by serpentinite. Ruth Creek 

and some of the other geochemically anomalous areas are in upper 

plate clastic rocks that may be underlain by siliceous carbonate 

rocks beneath thrust faults. The small lode deposits in the upper 

plate rocks may represent leakage anomalies above economicall} 

significant metal deposits in rocks in or below the thrust faul1 

zones. INTRODUCTION 

The Livengood district is in the Yukon-Tananaupland, approximately 80 road miles northwest of Fairbanks (fig. 1). It is accessible during the summer and 

fall via State Highway No. 2, an improved dirt and 

gravel road, and accessible during the entire year by 

fixed-wing aircraft. 

Gold placers of the Livengood district have produced 

approximately 380,000 fine ounces of gold from stream 

and bench placer deposits (Cobb, 1964), distributed 

approximately as shown in figure 2. Production has 

come from nonfloat placer operations, dredging, and 

drift mining. The major production was derived from 

the Livengood Creek area, Olive Creek, Lillian Creek, 

Ruth Creek, Amy Creek, and the Gertrude Creek area. 

There are at present active nonfloat gold placer operations on Livengood Creek and Amy Creek, but only 

sporadic mining activity on Ruth, Lillian, and Olive 

Creeks. 

Small veins and areas of mineralized rock have been 

prospected in several places, as shown in figure 2, but 

mineral production from the bedrock deposits has been 

negligible. 

Field investigations were carried out during the 

summer of 1967 as part of the Heavy Metals program 

of the U.S. Geological Survey and included geologic 

mapping, sampling of geologic materials, and evaluation of prospects. Sediment samples were collected 

chiefly from flowing streams and springs; some were 

collected from the dry beds of intermittent streams. 

The sediment samples were dried and sieved and the 

minus 80-mesh fraction analyzed by atomic absorption 

for gold, by spectrograph for about 30 elements, and 

by a specific atomic-absorption-type instrument for 

mercury. Bedrock samples were analyzed by the same 

methods, and a few samples of both rock and stream 

sediment materials were analyzed for go 1 d by fire 

assay to check the atomic-absorption results. 

GEOLOGIC ENVIRONMENT 

The southern two-thirds of the Livengood district 

is underlain chiefly by a metamorphosed clastic facies 

of sedimentary rocks, the northern one-third, by a 

chert-carbonate facies. These facies are separated by 

an eastward-trending belt of serpentinites (fig. 1). The 

serpentinites and associated rocks are considered to 

have been emplaced or-iginally along major fault zones 

after or concurrently with diorite intrusion at Amy 

Dome. The metadiorite at Amy Dome is not believed 

to be associated with any metallization. Much later, 

probably in Tertiary time, plugs which range in composition from quartz monzonite to monzonite were intruded, and it is with these rocks that the mineral deposits of the district are associated. 

The clastic facies consists chiefly of fossiliferous 

graywacke and argillite strata of Devonian age and 

similar lithologies of questionable Devonian age south 

of the Tolovana River and east of Cleary cr·eek, together with quartzite, chert-pebble conglomerate, and 

minor carbonate beds. Serpentinite with tectonic inclusions is spatially associated with this facies 

(Foster, 1967). Rocks commonly associated in turn 

with the serpentinites are metadiorite, metabasalt, 

peridotite, and silica-carbonate-talc rocks formed by 

the hydrothermal alteration of ultramafic rocks. Metadiorite is limited to the Amy Dome area and several 

places within the serpentinites. The chert-carbonate 

facies exposed in the northern part of the district consists chiefly of siliceous dolomite, black chert, black 

and gray banded chert, chert breccia, volcaniclastic 

and tuffaceous beds, and massive mafic igneous rocks 

of probable pre-late Mid d 1 e Devonian age. The 

Tertiary(?) quartz monzonite and monzonite occur 

chiefly as small discordant intrusives in the westcentral part of the area. 

The serpentinites form an eastward- to northeastward-trending complex belt of outcrops which extends 
beyond the boundaries of the district (Foster, 1967). 

The serpentinites are believed to have been emplaced 

originally as subhorizontal sheets associated with regional thrust faults, much as suggested by Irwin (1964) 

for the Klamath Mountains and Coast Ranges of northwestern California and southwestern Oregon. Their 

present outcrop pattern however is believed to reflect 

subsequent upward dragging along high-angle reverse 

faults; this interpretation is supported by the generally 

straight-line trend of the outcrops and by the apparent 

absence in the adjacent rocks of mineral or textural 

zonation such as reported by Blake, Irwin, and Coleman 

(1967) below the sole of a major thrust fault in northwestern California along which ultramafic rocks have 

been emplaced. 

The clastic facies is interpreted as overlying the 

serpentinite complex, and the chert-carbonate facies 

as underlying the complex. The serpentinite complex 

has been the locus of repeated fa u 1 tin g and consequently its' contacts in many places are faults, as shown 

in figure 1. 

Monzonitic plugs occur along a northwest-trending 

lineament that cuts the clastic facies and is thought to 

cut both the serpentinite complex and the chertcarbonate facies. 

ECONOMIC GEOLOGY 

Lode deposits 

The small lode gold deposits known in the Livengood district (fig. 2) are in siliceous graywacke ·near 

Lillian, Olive, and Ruth Creeks, in altered breccias 

on Ruth Creek, and in silica-carbonate rock on Gertrude Creek and at the Griffin prospect. These deposits 

are spatially related to .monzonitic stocks and dikes of 

probable Tertiary age (fig. 1). Brief descriptions of 

the deposits follow; the n u m be r s refer to locations 

shown in figure 2. 

( 1) Gertrude Creek pros p e ct.-Massive, ironstained silica -c C) rhonate rock, which is green on fresh 

surfaces, contams minor amounts of gold (sample 

No. 21, table 2). 

(2) Ruth Creek prospect.-Pyritized, brecciated, 

iron-stamed Igneous rock shows replacement by silica 

and carbonate and contais traces of gold (sample Nos. 

20 and 23-29, table 2). 

(3) Lillian Creek prospect. -Narrow auriferous 

arsenopyrite-quartz-scorodite veins occur in and near 

a limonite-stained dike in altered and contortedgraywacke-argillite country rock. Samples from theprospect contain from 0.5 to 48 ppm gold (sample Nos. 1-11 

and 22, table 2 ). 

(4} Griffin prospect.-Massive, sulfide-bearing, 

green-stained silica-carbonate-talc rock veined by 

quartz contains as much as 3. 9 ppm (parts per million) 

gold (sample Nos. 16-17, table 2 ). 

(5) Old Smoky prospect.-Narrow, northwestwardtrending auriferous arsenopyrite-quartz veins occur 

in a ferruginous quartzite footwall near the intersec2 

tion of an altered porphyritic biotite monzonite dike 

and a potassium feldspar-rich porphyry dike. Samples 

from the p r o spec t contain from 3 to 13 ppm gold 

(sample Nos. 12-15, table 2.) 

(6) Sunshine No. 2 prospect. -A northwestwardtrending, crumbly, auriferous dike with internal limonite veinlets is in contact with altered argillite. 

Recent work is a few hundred feet above two caved 

adits and an arrastre at the Hudson mercury prospect. Cinnabar nuggets were abundant in the heavy 

mineral concentrates from a cleanup made in August 

1967 at the Olive Creek gold placer. 

Sketch maps, sample locations, and chemical analyses from the Lillian Creek, Old Smoky, Sunshine No. 

2, Ruth Creek, and Griffin prospects, together with 

data from soil samples collected during pro spec t 

evaluation, are available in a U.S. Geological Survey 

open-file report (Foster, 1968). These data and other 

investigations (Foster and Chapman, 1967) indicate 

that the known gold lode deposits of the Livengood 

area are economically unattractive ·owing to their 

limited tonnages and(or) low grade. They may be significant, nevertheless, in that they suggest the possibility of concealed deposits in this seeminglyfavorable lithic and structural setting. 

Geochemical Investigations 

Geologic studies, rock analyses, and reconnaissance 

stream-sediment investigation have revealed a large 

polymetallic anomaly near Ruth Creek and several 

minor anomalies, including a go 1 d anomaly, near 

Lucille Creek (fig. 3). 

The Ruth Creek anomaly (fig. 3, localities 42-47 

inclusive) is characterized by above-background concentrations of gold, arsenic, mercury, antimony, 

molybdenum, silver, and boron in stream sediments 

(sample Nos. 42-47, table 1). Small sulfide veins, 

fracture coatings, disseminations, and replacement 

deposits (field Nos. 2-6, table 2) near small monzonitic stocks and dikes (field Nos. 1-3, table 3) contain anomalous concentrations some of these elements. 

which account,. at least in part. for their presence in 

stream sediments down drainage. The anomalous zinc 

concentrations on table 1 (sample Nos. 4 7, 48) may 

be real but are suspect because the samples were 

collected downstream from galvanized culverts. 

The presence of sulfidized rocks is also indicated 

by acid metalliferous water in Ruth Creek. The water 

is red from suspended oxidized i_ron compounds, although the ground water discharging into Ruth Creek 

is clear. The pH determined in the field on four samples ranged from 3.0 to 5.0; a laboratory determination on one sample gave apHofabout 2.75. The chemical composition of the stream water (table onpage 3) 

shows that at least some of the water has been in contact with various sulfides or sulfosalts other than pyrite. 

Other anomalous areas inc I u de those in the Olive 

Creek drainage, Alder Gulch are a, and near Cucille 

Creek. 
A sample from the left t rib uta r y of Alder Gulch 

(sample No. 40, table 1) contains anomalous amounts 

of lead and mercury, which are attributed to mineralization along or near the major east-trending fault 

inferred to underlie the headwater area of this drainage basin (fig. 1 ). 

The anomalously high gold content in streamsediment samples from Fanny Gulch (sample No. 9, 

table 1) and Lucille Creek (Sample No. 20, lab. No. 

AC E-419, table 1) suggests gold metallization in the 

chert-carbonate terrane, whereas the strongly anomalous gold values in panned concentrates from Lucille 

Creek (sample No. 20, lab. Nos. ACE-486,-488,-490, 

table 1) indicate the possible presence of a small gold 

placer deposit. 

The significance of anomalous amounts of manganese 

and antimony in a sample collected in the Frank 1 in 

Creek drainage (sample No. 23, table 1) is unassesseu; 

these anomalies may be related to the presence of 

mafic igneous rocks and massive chert-carbonate 

strata. 

CONCLCSIONS AND R EC0~1~1ENDATIONS 

The combination of minor lode deposits, geochemical anomaly, and structural pattern at Ruth Creek 

makes this area worthy of further investigation as a 

potential exploration target. Dip of the faults in the 

area is a critical factor. If the faults near Livengood 

(figs. 1, 4£l.) are low-angle thrusts dipping south, a 

footwall section of chert -carbonate rocks may exist 

at shallow depth. The siliceous dolomite and contorted 

or fractured chert in such a section are considered 

favorable host rocks for gold deposition. If the minor 

lode deposits in the H. uth Creek area represent leak.;. 

age over a mineralized zone, the chert-carbonate 

rocks, as well as some of the rocks in the fault zone 

would be logical targets for physical exploration. On 

th--: uther hand, if the faults are high-angle reverse 

'~~- strike-slip in nature (fig. 4I2_), then the favorable 

c't~ n-carbonate strata may be buried at too great a 

L:l'tl~ tu be a practicable target. 

Constituent 

Si02 

Al 

Fe (total) 

Mn 

Zn 

Cu 

As 

Ca 

Mg 

:\nalysis of Ruth Creek water 

~Analyst: k. B. Barnes] 

Concentration Constituent 

(ppm) 

19 Sr 

25 Ba 

106 \:a 

30 K 

5.2 \:H4 

.l sq-J: 

Cl 

76 }j 

92 

Concentration 

(ppm) 

0.6 

< .05 

6 

2 

.3 

986 

.4 

.7 

3 

It is ·interesting that the geologic setting and geechemica 1 suite of anomalous metals (arsenic. mercury, 

and antimony in particular) are similar to the setting 

and suite known to be favorable for the occurrence of 

Carlin-type gold deposits in north-central Nevada 

(Roberts, 1960, 1q66; Hardie, 1966; Erickson and 

others, 1966). However, the significance of these apparent similarities in not known. 

Geophysical investigations and more detailed geologic studies would be a logical first step in determining the dip of the faults, but ultimately d r i 11 in g 

would be required. If the information gained from an 

investigation of the Ruth Creek anomaly indicates economic mineralization associated with thrust sheets 

cut by Tertiary(?) intrusive rocks, then a search for 

similar. geologic environments along the Livengood 

trend is suggested. Both the anomalous metal concentrations in the fault-zone metasomatites and the silicacarbonate-talc rocks themselves are indicative of 

hydrothermal activity within and along the postulated 

major faults in the vicinity of the monzonitic rocks. 

The silica-carbonate-talc rocks qerived from the 

serpentinites are considered favorable hosts. Their 

low magnetic susceptibility, due to the oxidation of 

primary and secondary magnetite during hydrothermal 

alteration, contrasts sharply with that of the serpentinites. Thus, magnetometer surveys along and on 

strike with highly magnetic serpentinites might reveal 

the presence of silica-carbonate-talc rocks which 

could provide additional exploration targets. 

The available data suggest that the Livengood Creek 

gold placer deposits represent a sizeable gold resource 

which warrants additional economic a p p r a is a 1. Information from 640 drill holes in the gravels of the 

Livengood Creek area indicates some 17 million cubic 

yards of material with an average recoverable gold 

content of about 70 cents per cubic yard (gold at 535 

per ounce) (C. F. Herbert, written commun., 1966). 

The Lucille Creek gold placer deposit found during 

this study also should be investigated further, although 

the thick overburden and lack of water might make 

this deposit uneconomic. 

REFERENCES CITED 

Blake, M. C., Jr., Irwin, W. P ., and Coleman, R. G., 

1967, Upsidedown met amorphi c zonation, blueschist facies, along a regional thrust in California 

and Oregon: U.S. Geol. Survey Prof. Paper 575-C, 

9 p. 

Cobb, E. H., 1964, Placer gold occurrences in Alaska: 

U.S. Geol. Survey Miner a 1 Inv. Resources Map 

MR-38. 

Erickson, R. L., VanSickle, G. H., Nakagawa, H. M., 

McCarthy, J. H., Jr., and Leong, K. W., 1966, Gold 

g eo chemic a 1 anomaly in the Cortez distri.ct, 

Nevada: U.S. Geol. Survey Circ. 534. 

Foster, R. L., 1967, Tectonic inclusions from a serpentinite, east-central Alaska: U.S. Geol. Survey 

Prof. Paper 57 5-D, p. D120-D122~ 
Foster, R. L., and Chapman, R. M., 1967, Locations 

and descriptions of lode prospects in the Livengood 

area, east-central Alaska: U.S. Geol. Survey openfile rept., 3 p. 

Foster, R. L., 1968, Descriptions of the Ruth Creek, 

Lillian Creek, Olive Creek, Griffin, Sunshine No. 

2, and Old Smoky prospects, Livengood district, 

Alaska: U.S. Geol. Survey open-file rept., 10(?) p. 

Hardie, By:;_on S., 1966, Carlin gold mine, Lynn disrncr, Nevada: Nevada Bur. Mines Rept., 13, p. 73-

83. 

4 

Irwin,· W. P ., 1964, Late Mesozoic orogenies in the 

ultramafic belts of northwestern California and 

southwestern Q_regon: U.S. Geol. Survey Prof. 

Paper, 501-C, 9 p. 

Roberts, R. J., 1960, Alinement of mining districts 

in north-central Nevada, i!l Geological Survey Research 1960: U.S. Geol. Survey Prof. Paper 400-B, 

p. Bl7-Bl9. 

1966, Metallogenic provinces and mineral belts 

----rilNevada: Nevada Bur. Mines Rept., 13, p. 47-72. 
TABLES 1-3 AND FIGURES 1-4 
Table I.--Semiquantitative spectrographic analyses and other analyses for_~~l~. 

[Looked for but not detected: Bi, Cd, Pt, Pd, Rh, Sc, Sn, Ta, Te. Symbols used: <, less than; 

detectabili ty. Spectrographic analyses by D. J. Grimes; results are reported to the nearest 

sorption by A. L. Meier, R. L. Miller, and T. A. Roemer. Mercury analyzed by instrumental are given in percent. pH, field determination; sample 42 includes laboratory determination 

Au Au 

Sample Lab. Field Spectra- Atomic 

No. No. No. Ag As graphic Absorp- B Ba Be Co Cr Cu Hg La 

tion 

1 ACE-508 1 A A ( 200) A(lO) <0.02 15 500 <1 20 100 30 0.85 20 

2 217 2 A A A <.1 15 700 <1 10 100 20 .36 20 

3 423 3 A A A <.02 15 500 A 15 1,500 30 .30 A 

4 425 4 A A A <.02 10 300 <1 7 30 30 .20 20 

5 426 5 A A A <.02 15 700 <1 15 500 30 .so< 20 

6 428 6 A A A <.02 20 1,000 1 10 70 30 .13 30 

7 429 7 A A A <.1 15 500 1 A 15 30 .18 < 20 

8 427 8 A A A <.02 20 700 <1 15 300 20 .30 20 

9 434 9 A A A 10.5 20 300 A 20 2,000 30 >20 

10 433 10 A A A <.02 20 500 <l 10 150 30 .16 20 

11 437 11 A A A <.02 10 300 A 30 1,000 30 .34 A 

12 436 12 A A A <.02 15 300 A 15 700 30 .26 A 

13 438 13 A A A < .1 15 200 <1 30 1,500 30 .38 A 

14 447 14 A A A <.1 20 200 1 5 so 30 .30 < 20 

15 446 15 A A A <. 02 15 300 A 30 3,000 30 .26 A 

16 441 16 A A A <. 02 10 300 A 30 2,000 30 .12 A 

17 440 17 A A A < .1 15 200 A 30 1,500 30 .52 A 

18 439 t8 A A A <. 02 15 300 A 20 1,500 30 .12 A 

19 417 19 A A A <. 02 <10 500 A 10 70 30 .08 A 

20 419 20 A A A 2.3 15 500 A 10 100 20 .10 20 

21 420 21 A A A <.02 15 700 <1 15 700 30 .60 <20 

22 421 22 A A A <.02 10 300 A 5 so 15 .08 A 

23 200 23 A A A <.02 15 500 A 7 so so .14 A 

24 405 24 A A A <.02 20 500 A 10 700 30 .11 30 

25 404 25 A A A <.02 10 300 A 15 300 20 .11 A 

26 478 26 A A A <. 02 15 500 <1 15 70 is .20 20 

27 477 27 A A A <. 02 15 500 <1 10 70 30 .07 20 

28 476 28 A A A < .1 15 300 <1 20 300 30 .07 <20 

29 403 29 A A A <. 02 15 500 A 15 300 20 .06 20 

30 402 30 A A A <. 02 15 300 A 20 700 20 .OS A 

31 401 31 A A A <. 02 20 300 A 30 700 20 .07 A 

32 400 32 A A A <. 02 15 500 A 20 500 20 .08 <20 

33 069 33 A A A 10 300 <1 7 so 20 .22 <20 

34 384 34 A A A <. 02 10 1,000 < 1 15 300 50 .13 A 

35 386 35 A A A <. 02 20 1,000 A 10 300 30 .12 A 

36 385 36 A A A < . 02 15 500 A 30 700 30 .10 A 

37 382 37 A A A < . 02 10 500 A 7 70 15 .08 20 

38 381 38 A A A < . 02 15 500 A 50 2,000 20 .10 A 

39 380 39 A A A < • 02 10 500 A so 1,000 20 .07 A 

40 379 40 A A A < . 02 10 300 A so 2,000 30 . 85 <20 

41 522 41 A A A < . 02 20 1,000 <1 10 70 30 .60 20 

42 103 42 A 300 A < • 02 70 700 2 7 70 30 .26 30 

43 114 43 A 300 A < . 02 70 700 2 7 70 30 .18 so 44 118 44 A 200 A • 5 so 500 <1 15 150 20 .20 20 

45 119 45 5 700 A . 2 70 700 1 15 150 30 .20 30 

46 265 46 A 300 A 2.0 100 500 <1 15 200 20 20 

47 330 47 • 5 2,000 < 10 8.2 150 1,000 1.5 10 200 so 1.4 so 48 461 48 < • 5 700 A < . 02 70 1,000 1.5 15 300 30 1.3 30 

49 089 49 A 200 A 30 700 1 20 200 30 .60 20 

50 088 so A <200 A 30 500 1 15 150 30 1.2 20 

6 
', ~rl';1tt.'r tlun; .\, n~""~t ,ktt.'•."tt.'d; ---, tH""~t ll""~t""~kl'd for; I, interfl'l"l'llCl'; (~00), lm,er limit of 

nu•".!'t.'r in tht.' :'t.'rit.':' 1, tl.-, ll.S, (1. , o.~. ll.lS, 0.1, ant.! :'O 011. l~old analY:ed lw atomic ahr:,'tlh',\ h· :-::. I. \~'l'lt.'. Rl':'lllt:' :ll"l' \! \"l'll in part!' per million cxo:cpt for 'lg·, r:e, l~a, Ti, ,,·hich 

;11:',', ;1:;. indi .. ·at,,,\ by an :l:'tl'ri!'k. 1: L'ld numbl'r!' arc !'ho,,·n in fi~un' 31 

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so 

150 

70 

100 

200 

100 

150 

100 

70 

100 

100 

300 

300 

70 

100 

0.7 

• 7 

1.5 

1.5 

1.5 

Fe 

l.S 

.7 2 

. 15 . 7 

l.S 2 

1.5 2 

.7 2 

1.5 

1.5 

1.5 

• 3 

1.5 

2 

2 

1.5 

1.5 

1.5 

• 7 

• 5 

• 7 

1.5 

1.5 

• 7 

• 7 

1 

1 

1 

1 

1 

• 5 

• 7 

1 

l.S 

. s 

2 

2 

2 

1.5 

2 

• 7 

2 

3 

2 

1.5 

l.S 

3 

1.5 

1.5 

1.5 

2 

1.5 

2 

2 

2 

2 

2 

2 

1.5 

2 

1.5 

l.S 

3 

2 

2 

.3 2 

.3 2 

.3 .3 

.3 2 

.3 3 

150 0.7 1.5 

100 . 5 3 

150 .5 2 

70 .5 3 

70 .3 2 

1 

1 

1 

3 

1 

1 

1 

1 

1 

1 

1 

Ca 

• 7 

.1 

• 7 

• 7 

1 

l.S 

l.S 

• 7 

1 

1 

1 

1.5 

1.5 

1 

1 

• 7 

• 7 

• 5 

• 5 

1 

• 7 

1 

• 3 

• 7 

·• 5 

• 3 

• 7 

• 7 

.OS 

.OS 

• 2 

.1 

o.s 

.1 

• 2 

.07 

. 1 s 

Ti 

0.7 

• 3 

. 3 

• 3 

• 3 

pll 

b.O 

6.S-7.0 

6.0 

6.S 

6.0 

. s 6. 0 

• 2 s. 0 

.3 6.0 

.3 6.0(?) 

. 3 

. 3 

• 3 

• 3 

• 2 

• 2 

• 2 

• 3 

• 5 

.3 

• 3 

• 7 

• 3 

• 3 

• 3 

• 3 

• 3 

• 3 

• 3 

• 3 

.3 

• 3 

• 3 

• 3 

• 3 

. s 

• 3 

. 3 

. 3 

• 3 

• 3 

• 3 

6.5 

6.0 

6.0 

s.s 

6.0 

6.0 

6.0 

6.0 

6.5-7.0 

6.5-7.0 

6.5-7.0 

6.0 

6.0 

6.0 

6.5-7.0 

s.s 

s.s 

6.0 

6.0 

6.0 

6.0 

6.0 

6.0 

6.0 

6.0-6.S 

6.0 

6.S 

.3 3.S(2.7S)* 

.3 3.0 

.3 s.o 

.3 4.5 

0.3 

• 2 

.3 

.3 

• 3 

6.0 

s.s 

6.0 
Table I.--Semiquantitative spectrographic analyses and other analyses for gold and 

Au Au 

Sample Lab. Field Spectro- Atomic 

No. No. No. Ag As graphic Absorp- B Ba Be Co Cr Cu Hg La 

tion 

51 ACE-082 51 A 200 A 30 300 1 15 150 30 .70 20 

52 526 52 < 0 5 A A <.02 70 700 1 20 150 so .85 so 53 090 53 A A A 30 300 <1 30 1,000 30 .30 <20 

54 182 54 A A A <.02 20 500 <1 20 300 30 .55 A 

55 135 55 0 7 A A <.02 <10 150 <1 7 so 30 .20 A 

56 129 56 7 A A <.02 15 150 A 100 700 30 .15 A 

57 120 57 0 7 A A <.02 30 150 <1 30 150 30 .18 A 

1/58 128 58 A A A <.02 15 500 <1 15 150 15 .so <20 

11 2o 486 20 60 

11 2o 488 20 112 - 20 490 20 36 

!/Panned concentrate. 

8 
mercurv of stream- and spring-sediment samples from the Livengood district--Continued 

''o ~fn Nh Ni Ph Sh Sr \' \\' y Zn Zr \fg Fe Ca Ti pH 

A soo < 10 100 lS A so 100 A 10 <200 70 • 7 3 .lS • 2 6.0 

<S soo 10 100 150 A 100 100 A 15 200 100 . s 3 • 3 .3 

A 500 < 10 300 10 A 70 70 A 1S A 70 l.S 3 . 7 • 3 6.0 

A soo < 10 1SO lS A 70 so A 1S A 70 1 2 • 3 . 3 

A 300 A 30 <10 A <SO 70 A 10 A 30 . s l.S . 7 • 2 

A soo A 150 <10 A 1SO 1SO A 10 A 30 2 3 l.S .3 

A 700 < 10 70 <10 A so 70 A 10 A 70 • 7 3 • 3 . 3 6.0 

A 1,000 < 10 30 <10 A 70 70 A 10 A 70 .3 2 . 7 • 2 6.0 

9 
Table 2. Semiquantitative spectrographic analyses and~ 

[Looked for but not detected: Bi, Cd, Hg, Pt, Pd, Rh, Sc, Sn, Ta, Te. Symbols used:<, less 

ference; (10), lower limit of detectability. Spectrographic analyses by Arnold Farley, Jr., 

0.3, 0.2, 0.15, 0.1, and so on. Gold analyzed by atomic absorption by A. L. Meier, R. L. 

Yager. Results are given in parts per million except for Mg, Fe, Ca, Ti, which are given 

Sample 

No. 

l 

2 

3 

4 

5 

6 

7 

8 

9 

10 

ll 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

Lab. Field 

No. No. 

ACE-220 

221 

224 

225 

226 

227 

228 

230 

232 

234 

235 

343 

344 

345 

346 

349 

350 

373 

375 

376 

392 

409 

107 

108 

109 

110 

111 

112 

113 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

3 

5 

5 

5 

5 

4 

4 

6 

6 

2 

1 

3 

2 

2 

2 

2 

2 

2 

2 

Description 

Ag 

1.5 

• 5 

1.5 

1.5 

2 

1.5 

1.5 

• 5 

A(. 5) 

2 

1.5 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

• 5 

• 5 

Au 

As 

Spectra- Atomic Fire 

graphic absorp- assay 

tion 

B Ba Be Co 

>10,000 

G 

G 

G 

G 

G 

G 

G 

G 

10,000 

AOO) 

A 

10 

10 

<10 

15 

15 

A 

A 

A 

3,000 A 

>10,000 A 

G A 

G A 

G <10 

1,500 

>10,000 

A(200) 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

4.0 

3. 5 

30 

23 

48 

20 

25 

1.3 

1.4 

0.7 

0.5 

7.3 

13 

3 

3 

1.3 

3.9 

0.8 

0.5 

1.0 

0.9 

0.8 

<.02 

<.02 

<.02 

0.1 

.03 

<.02 

<.02 

13 

3 

39 

21 

44 

26 

47 

1.4 

150 

100 

100 

30 

300 

1,000 

700 

500 

300 

500 

200 

150 

150 

5 A(5) 

5 A 

l.5A 

2 A 

2 A 

l.5A 

l. 5 7 

l. 5 10 

100 

70 

<10 

70 

500 

50 

1,000 

<1 50 

200 

l. 6 150 

7.0 100 

4.6 100 

3.8 300 

1,500 

150 

50 

100 

150 

3 20 

3 

2 

2 

2 

3 

30 

10 

20 

7 

5 

5.6 

<10 

<10 

30 

A(20) 

<1 50 

<1 20 

.4 <10 A A(l) 50 

20 300 A 

20 200 A 

70 700 <1 

50 ·700 <1 

70 1,000 <1 

100 1,500 <1 

20 200 A 

Description 

50 

70 

70 

70 

100 

70 

70 

Samples 12-15 from Old Smoky prospect. 

Cr 

70 

10 

50 

20 

50 

20 

10 

5 

<5 

30 

Cu 

150 

200 

300 

200 

500 

300 

500 

15 

10 

150 

50 100 

200 50 

20 100 

50 15 

30 500 

1,000 

700 

1,000 

2 

<2 

50 

300 50 

300 200 

300 30 

300 150 

150 100 

150 50 

300 20 

Samples 1-ll from Lillian prospect. 

1 - - - - - - - 10-ft chip sample (2-in, interval) along reddishbrown quartz-arsenopyrite zone. Sample is in 

or near top of brown pyrite-bearing siltstone 

and below a hanging wall of gray argillite, 

12 - - - - - - - 5-ft chip sample from biotite monzonite-quartzite 

contact zone; 3 narrow (l-in.) quartz-arsenopyrite veins are present in quartzite. 

2 - - - - - - - Selected samples from No. 1 chip sample zone. 

3 - - - - - - - Selected sample from No. 4 chip sample zone. 

4 - - - - - - - 7-ft chip sample (2-in. interval) in narrow (2-in.) 

r e dd ish-brown toy e llo w-b r own {!Uartssulfide(?) vein in gray silty mudstone. 

5 - - - - - - - Selected fragments from No. 4 chip sample zone. 

6 - - - - - - - .Selected quartz-arsenopyrite vein material from 

No. 4 chip sample zone. 

7 - - - - - - - Do. 

8 - - - - - - - Grab sample from altered, yellow-brown dike 

rock. 

9 - - - - - - - Selected sulfide mass from interior of No. 8 dike. 

10 - - - - - - - 5-ft chip sample (2-in. interval) across altered 

dike. 

11 - - - - - - - Selected material from friable, reddish-brown 

altered material containing quartz veinlets. 

13 - - - - - - - Vein grab sample from No. 12 zone. 

14 - - - - - - - Do. 

15 - - - - - - - Do. 

Samples 16-17 from Griffin prospect. 

16 - - - - - - - Adit tailings, grab samples of massive gray carbonate which contains quartz veins and is 

stained green by weathering of disseminated 

sulfides. 

17------- Do. 

Samples 18-19 from Sunshine No. 2 prospect. 

18 - - - - - - - Grab sample from altered yellow-brown dike. 

19--- - - --Selected samplefromyellow-brownfriablematerial in lower adit tailings. 

10 
~nalyses from lode prospects in the Livengood district 

than;>, greater than; G, greater than 10; A, not detected; ---,not looked for; I, interand E. E. Martinez; results are reported to the nearest number in the series l, 0.7, 0.5, 

Miller, and T. A. Roemer. Gold analyzed by fire assay by W. D. Goss, L. C. Huff, and T. L. 

in percent. Field numbers are shown in figure 2] 

La Mo Mn Nb Ni Pb Sb Sr 

50 15 300 10 15 50 100 1,000 

100 15 150 20 10 30 < 100 1,000 

A( 2 0) A(5) 100 < 10 7 15 100 300 

A 5 100 < 10 10 <10 <100 1,500 

A 10 70 < 10 7 20 200 700 

A A 70 <10 7 <10 100 100 

<20 A 70 <10 15 A(lO) 300 A( 50) 70 A 200 15 20 <10 A(lOO) 1,000 

A A 500 10 15 30 500 700 

100 10 500 30 100 20 1,500 700 

100 5 1,000 15 100 100 1,500 1,000 

A A 100 < 10 10 10 100 150 

A A 100 <10 50 A 300 A 

A A 150 <10 7 A 300 A 

50 A 100 10 7 <10 100 150 

A <5 1,000 A 1,000 15 500 700 

A A 1,000 A 300 <10 200 200 

A <5 2,000 <10 300 <10 200 A 

A A 1,500 <20 50 10 A 150 

A A 1,500 < 20 50 10 A 100 

A A 2,000 <20 70 A A 100 

A A 2,000 <20 100 A A 200 

A A 1,500 <20 70 A A A 

A A 2,000 <20 70 A A 200 

A A 2,000 <20 150 A A 150 

Description 

20 - - - - - - - Grab sample from serpentinite scree. Sample 20 

from Ruth Creek bench placer cut. 

21 - - - - - - -Grab sample from massive green-stained quartzcarbonate. Sample 21 from Gertrude C r e e k 

prospect. 

22 - - - - - - - Grab sample from yellow-brown silicic dike rock. 

Sample 22 from Lillian Creek prospect area. 

Samples 23-29 from Ruth Creek prospect. 

23------- Grab sample from gray (reddish-brown on 

weathered surface) medium-grained brecciated 

sulfide-bearing igneous rock composed of 

plagioclase, chlorite, and carbonate. 

24 - - - - - - - Grab sample from dark-gray (reddish-brown on 

weathered surface) fine-grained sulfidebearing igneous rock composed of plagioclase, 

chlorite, and carbonate and containing quartz 

veinlets. 

11 

v w y Zn Zr Mg Fe Ca Ti 

200 50 20 <200 150 0.2 5 0 .1. 0.2 

100 70 50 <200 300 .05 7 .l • 2 

70 A 5 <200 50 .l 7 .05 .l 

50 A A( 5) <200 30 .07 7 .07 .05 

70 A 19 <200 50 .l 10 <.05 .1 

70 A A <200 20 .07 10 <.05 .l 

30 A <5 <200 <10 .05 10 <.05 .05 

50 70 50 <200 200 .l 7 • 3 .2 

<10 150 A 200 A(lO) .02 20 • 2 .007 

70 50 50 300 500 • 2 7 • 2 • 2 

100 <50 50 300 200 1 7 1.5 2 

50 <50 A <200 70 .l 10 .07 .07 

15 A A 200 A <.02 20 <.05 .007 

20 A A < 200 20 <.02 20 <.05 .03 

70 <50 15 <200 100 .07 10 .15 .1 

30 A A <200 A 7 5 10 .05 

10 A A 200 A 3 3 2 .003 

50 A A <200 <10 7 7 1 .05 

200 A 15 A 70 5 15 7 • 7 

300 A 10 A 100 5 15 5 >l 

300 A I· 200 150 3 20 3 1 

500 A I 200 150 2 20 5 >1 

300 A I 200 150 1.5 >20 • 7 • 3 

200 A 30 <200 70 3 15 15 >l 

500 A I 200 150 1.5 20 5 • 5 

Description 

Samples from Ruth Creek prospect-Continued 

25 - - - - - - - Grab sample from light-gray (reddish-brown on 

weathered surface) fine-grained brecciated, 

sulfide-bearing sheared igneous rock made up 

of plagioclase, chlorite, and carbonate. 

26 - - - - - - - Selected sample from light-gray (reddish-brown 

on weathered surface) fine-grained sulfidebearing cataclasite. 

27------- Selected sample from greenish-gray finegrained sulfide-bearing cataclasite. 

28 - - - - - - - 2.5-ft chip sample (4- to S-in. interval) in lightgray (reddish-brown on weathered surface) 

massive sulfide-bearing carbonate metasomatite derived from the replacement of igneous 

breccia. 

29 - - - - - - - S e 1 e c ted sample from light-gray (reddish on 

weathered surface) brecciated cataclasite. 
Table 3.--Semiquantitative spectrographic anallses and gold 

[Looked for but not detected: Au (spectrographic), Bi, Cd, Hg, Pt, Pd, Rh, Ta, Te. Symbols ( . 5)' lower limit of detectability. Spectrographic analyses by Arnold Farley, Jr.; results on. Gold analyzed by atomic absorption by A. L. Meier, R. L. Miller, and T. A. Roemer. 

cent. Field numbers are shown in figure 2] 

Au 

Atomic 

Sample Lab. Field Ag As absorp- B Ba Be Co Cr Cu La Mo Mn 

No. No. No. tion 

1 ACE-001 3 A(. 5) 300 <0.02 50 700 7 A(lO) A(lO) 30 150 5 150 2 002 3 A A(200) <.02 100 700 10 A A 50 200 15 150 

3 003 3 A 1,500 .04 100 2,000 20 A A 50 300 10 150 4 004 3 A 200 <.02 100 1,500 15 A A 70 200 5 150 5 005 3 A 500 .02 100 2,000 15' A A 30 200 7 100 

6 006 3 A 500 <.02 100 2,000 10 A A 30 200 15 150 7 007 3 A A <.02 30 500 3 70 700 50 50 10 1,500 8 014 3 A A <.02 70 700 2 A A 30 100 A( 5) 2,000 9 087 2 

10 

2 1,000 300 >5,000 5 10 30 30 200 15 100 

091 4 A A 70 

11 117 1 A 500 <.02 70 

12 183 5 A A .04 70 

13 192 4 A A .02 30 

Description 

l-6 - - - - - - - lO-ft chip samples (2-in. interval in bedrock; 

continuous sampling on soft material). Bedrock sample is sulfide-bearing gray to darkgray (dark brown on weathered surface) 

altered porphyritic fine-grained latite(?) with 

sericite and limonite masses adjacent to fractures; quartz nests and veinlets common; 

opaque minerals associated with fractures, 

quartz nests, and matrix material. Soft material is essentially limonitic igneous rock decomposed in place. 

12 

300 10 A 10 50 70 A 1,500 

2,000 2 10 50 30 200 5 700 

1,000 5 A 10 20 100 A 1,000 

700 10 100 30 30 200 A 1,000 

Description 

7 - - - - - - - Grab sample from altered sulfide-bearing gray 

(reddish-brown on weathered surface) igneous 

rock with minor c h 1 or it e and sericite; approximately 70 percent of rock is replacement 

carbonate. 

8 - - - - - - - Grab sample from altered sulfide-bearing darkgray (brown on weathered surface) porphyritic 

fine-grained latite(?) with quartz veinlets, 

quartz nests, minor sericite and carbonate, 

and disseminated opaque minerals. 
'~nalyses by atomic absorption of rocks from the Livengood district 

used: <, less than; >, greater than; A, not detected; ---, not looked for; I, interference; 

'~re reported to the nearest number in the series 1, 0.7, 0.5, 0.3, 0.2, 0.15, 0.1, and so 

·~esults are given in parts per million except for Mg, Fe, Ca, Ti, which are given in perNb Ni Pb Sc Sb Sn Sr v 

70 A( 2) 50 A A(lOO) 20 A(lOO) 15 

;:.oo A 70 10 A 30 A 20 :: 00 A 70 10 A 50 A 20 :~ 00 A 100 10 A 30 A 20 

:; 00 A 70 15 A 50 A 20 

:; 00 200 70 10 A 50 A 15 

<20 3 A 30 I A 500 200 

50 A 50 A A A 150 20 

30 150 200 20 500 A 2,000 200 

:! 00 20 30 15 A I A 10 

50 2,000 30 A A A A 20 

30 A 30 100 A A A 20 

::00 10 200 10 A 30 A <10 

Description 

9 - - - - - - - Grab sample from sulfide-bearing yellowishbrown medium-grained monzonitic(?) dike 

rock with secondary limonite, quartz, sericite, 

and clinozoisite. 

10 - - - - - - - Scree grab sample from dark-gray to darkgrayish-brown (brown on weathered surface) 

p or ph y r it i c medium-grained quartz monzonite; pseudographic texture with quartz 

enclosing brown-stained K-feldspar and plagioclase. 

w y Zn Zr Mg Fe Ca Ti 

A( 50) 70 <200 >1,000 0.7 5 <0.05 0.2 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

A 

13 

150 <200 >1,000 • 5 7 <.05 .5 

150 300 >1,000 • 7 10 <.05 • 5 

150 200 >1,000 .7 10 <.05 • 5 

150 200 >1,000 .7 15 <.05 .5 

150 300 >1,000 • 7 10 <.05 • 5 

15 <200 150 1.5 15 5 1 

70 200 300 .7 10 • 3 • 5 

70 30 300 300 • 2 7 • 2 • 3 

200 500 >1,000 • 2 7 .07 • 2 

70 A 700 • 5 7 • 2 >1 

50 A 200 .7 10 • 3 • 5 

150 500 >1,000 • 3 15 .05 • 2 

Description 

11 - - - - - - - Grab sample sulfide-bearing gray (reddishbrown on weathered surface) porphyritic finegrained latite(?) with quartz nests and minor 

carbonate. 

12 - - - - - - - Grab sample from sulfide-bearing dark gray 

(brown on weathered surface) medium-grained 

monzonite; limonite stain commori. 

13 - - - - - ·- - Scree grab sample from brownish-gray (brown 

on weathered surface) porphyritic mediumgrained quartz monzonite with limonite stain. 

Minor elements (table 3) indicate this rock to 

be a possible late-stage differentiate. 
a ... trom u.s. Gaolo,ical survey 

Livtnlood (C-4), 1952; Liven1ood (8-4), 1953; 

Livtnlood (C-3), 1954; and Liventoocl (B-3), 1954 

SCALE 1 :63 360 GeoiOIY by R. l. Foster, .1967 

1 Y.i 0 1 2 MILES 

CO!'-~TO~J~ I~T£~\!:\L 1~ f'££T 
....... 

CJl 

2000 

1000 

~ <:,;, 

Q 

~ 

~ 

-~ § 

~ 

~ 

~ ~ ~ 

~ 

A A' 

EXPLANAT 0 N 

Placer workings 

[/8al·····~ Flood-plain alluvium 

B 

Surficial deposits, undifferentiated 

Monzonitic • rocks 

Black and dark-gray to 

~ grayish-brown graywacke 

and argillite 

Includes alternating arenaceous and argillaceous clastic beds of Devonian(?) age south of the Tolovana 

River and east of Cleary Creek 

FAULT AND UNCONFORMITY 

Green fine- to coarse-grained metadiorite (dike 

equivalents included in Pzsp) 

Dark- to light-green serpentinite, peridotite, metabasalt, tectonic inclusions, and silica-carbonate-talc 

metasomatites 

>-

0:: 

<( 

z 

0:: 

w 

1-

<( 

~ 

0 

}

·--

~; wo:: 

f-<( 

z 

~ 

z 

0 

> 

w 

0 

~ 

0 

N 

0 

w 

..J 

<( 

0.. 

Dark-green metabasalt (locally sheared) 

llil!ll:::~;~,:iiji!!l Gray siliceous dolomite with interbedded gray and 

black chert 

Black and gray banded • chert breccia, black marble, 

volcani-clastic and tuffaceous beds 

--------------?--

Contact 

Approximately located; queried where doubtful 

Fault 

Dotted where concealed; bar and ball on 

downthrown side 

..,. ..,. ..,. ... ... 

Thrust or reverse fault 

Dotted where concealed; sawteeth on upper plate or 

hanging wall side 

-+- ~ ...J.:._B 

vertical Inclined 8 1 = 82 

Strike and dip of foliation 

---- ~5 

vertical Inclined 

Strike and dip of joints 

Figure 1.--Generalized geologic map and sections of the Livengood district. 

~ 

0 

N 

0 

w 

....J 

<( 

0.. 

ilO/ 

Strike and plunge of 

lineation 

-Vein 

_..( 

Adit 

® 

Fossil location 

---:?a~! 

~ 

cJ 

~ 

.§' 

<> "'""" 

~ APPROXIMATE MEAN 

DECLINATION, 1968 
f-' 

0' 

65" 

30' 

I 

-- .?8Js~, 

,;! 

~ 

~0 

~ 

0 

~ 

.~ I APPROXIMATE MEAN 

LDECLINATION. 1968 

Base from U.S. Geological Survey 

·o8 

911-: • ..2 

j 

®10 6 3 

!:l4 

Livengood (C-4), 1952; Livengood (8-4), 1953; 

Livengood (C-3), 1954; and Livengood (8-3), 1954 

f:l.5 

~::::,.a 

·~ t:\ .. 4. 

' so··· 0 6 

CY7 

fi1 

rtJ3 

®11 004 

148"30' 

Q12 

05 

®'~ 

oa 

CJi; 

EXPLANATION 

2 05 ® 

Inactive Active 

Goid placer 

~ Gold lode prospect 

Number is field number 

given in table 2 

3 

D 

Rock sample location 

Number is field number 

.given in table 3 

.LODE 

1. Gertrude Creek prospect 

2. Ruth Creek prospect 

3. Lillian Creek prospect 

4. Griffin prospect 

5. Old Smoky prospect 

6. Sunshine No.2 prospect 

PLACER 

1. Good Luck (Lucky) Creek 

2. Amy Creek 

3. Amy Creek (Fanny Gulch) 

4. Livengood Creek-Franklin Creek 

area (includes placer drift mine 

on benches in Livengood Creek) 

5. Gertrude Creek 

6. Gertrude Creek (Warwick Gulch) 

7. Glenn Gulch 

l 

8. Livengood Creek-Myrtle Creek area 9. Ruth Creek area 

10. Lillian Creek 

11. Olive Creek 

12. Ester Creek __j 

1 lh 0 1 2 MILES 

CONTOUR INTERVAL 100 FEET 

Figure 2.--Map showing distribution of gold lode prospects and productive gold placer deposits i~ the Liv2~good district. 
----.1 

,,. 

lO' 

I 

L 

-_-:r 

88Se from U.S. Gllolotical Survey 

Liventood (C-"), 19!52; Liventood (8-4), 1953; 

Liventood (C-3),19~4; and Livenaoocf (8-3), 1954 

.33 

~23-lfl 

~22 

.24 

~5 .J.1 

.2& 

~~ •so 

32~, 

·~··31 

' 4~·{;] t-M.""r . '"11 

~· .·.·~ 

--u~-~· 

.2. 

.63 

•s•· 

~ 

•e 

.10 

.it 

,.. 12 •• ,, .. ~4 

• • 17 ,..,6 1 \ . 

•; 

.7 

f§J 

.66 

--- .se 

~ 

EXPLANATION 

.60 

Stream-lediment umple site 

22 

-IVfl 

Spriq-eediment sample site 

Nv:mlur• a,.. ,lield nvtnber• 

given in table 1 

.,7 ~ 

~ 

~ 

~ 

I! [/

~2~ 

APPROXINATIE NIEAN 

DIECLINATION, 19 .. 

~a·· 

I 

I 

_:j 

1 ~ 0 1 2 MILES 

I I I I 'J 1 I 

Figure 3.--Map of Livengood ~CONTOUR INTERVAL 100 FEET 

district showing location of stream- and spring-sediment samples and anomalous metal concentrations. 
c EXPLANATION 1000' 

Oms 1111 r--~ 1--

a:>-

wa: 

Monzonitic rocks 1-<( 

500' 

)( 

[::f~fu?:I\l H Ill 

Ci 

E 

0 

() Metasedimentary 

iii strata 

UNCONFORMITY Q 

~ 

bG 

c: 

"iiil 

SEA c: 

10 

LEVEL J: Metadiorite(?) 

Ill 

., 

u 

J! 

! u .. Silica-earbonate-talc 0 c N 0 

500' -e 0 

.. w 

'T J 

-r <( ., 0.. 

~ 

0 Serpentinite 

1000' 

c A 1(~~&~1 Chert-carbonate 

facies 

500' )( 

Ill 

Ci Contact E 

0 ....,__ () 

iii Unconformity ~ 

bG ~ 

c: 

"iiil Fault c: 

10 Reverse or thrust J: 

B 

0 500 1000 FEET 

~--------~-----------J 

Figure 4.--Digrammatic geologic cross sections of the Ruth Creek area, (C--C' irt:fig. l), 

showing alternative structural interpretations. A. Thrust interpretation, witn possible mineralization in: a, silica-carbonate-talc selvage-below faulted unconformity; b, brecciated 

mafic stock; and-c, chert-carbonate footwall complex. B. High-angle reverse or strike-slip 

fault interpretation with mineralization in: ~' silica~carbonate-talc eelvage; and b, brecciated mafic stock. -

18 

-1< U.S. GOVERNMENT PRINTING OFFICE: 1969 0-353-522