Distribution of Gold, Copper 

and Some Other Metals in 

the McCarthy B-4 and B-5 

Quadrangles, Alaska 

Ma·ry H. Mlfter 

Distribution of Gold, Copper 

and Some Other Metals in 

the McCarthy 8-4 and B-5 

Quadrangles, Alask.a 

By E. M. MacKevett, Jr., and James G. Smith 

GEOLOGICAL SURVEY CIRCULAR 604 

Was~Nngfon J 968 
United States Department of the Interior 

STEWART L. UDALL, Secretary 

Geological Survey 

William T. Pecora, Director 

Free on application to the U.S. Geological Survey, Washington, D.C. 20242 
Abstract--------------------------------

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

Geology---------------------------------

Geologic setting -----------------------

Summary of economic geology-----------

Distribution of metals------------------

Gold--------------------------------

Copper ----------------------------- Silver ------------------------------

CONTENTS 

Page 

1 

1 

1 

1 

2 

3 

3 

3 

6 

Geology--Continued 

Distribution of metals--Continued 

Antimony ---------------------------

~olybdenum-------------------------

Arsenic-----------------------------

Other meta~s ------------------------

Summary and suggestions for prospecting --

References cited-------------------------

ILLUSTRATIONS 

Page 

Figure 1. Index map showing location of the ~cCarthy B-4 and 

B-5 quadrangles ------------------------------------------- 2 

2. Generalized geologic map showing sample locations 

in the ~cCarthy B-4 and B-5 quadrangles -------------------- 4 

TABLES 

Page 

Table 1. Analyses of rocks, altered zones, and lodes from the 

~cCarthy B-4 and B-5 quadrangles-------------------------- 8 

2. Analyses of stream-sediment samples from the 

~cCarthy B-4 and B-5 quadrangles-------------------------- 18 

III 

Page 

6 

6 

6 

7 

7 

7 

Distribution of Gold, Copper, and Some Other Metals in the 

McCarthy B-4 and B-5 Quadrangles, Alaska 

By E. M. MacKevett, Jr., and James G. Smith 

Abstract 

The main mineral commodities in the McCarthyB-4 and B-5 

quadrangles, eastern Alaska, include copper·, gold, silver, antimony, molybdenum, and arsenic. Analyses of stream-sediment 

and rock samples, and related geologic investigations, provide 

data on the metal contents of the previously known depositt;;, of 

several newly found deposits, of stream-sediment samples, and 

of many of the rocks and altered zones. Some of the newly found 

deposits probably merit more thorough examinations. 

INTRODUCTION 

Geochemical investigations were conducted during 

the summer of 1967 in the McCarthy B-4 and B-5 

IS-minute quadrangles, Alaska, and in small adjacent parts of the McCarthy A-4 and A-5 quadrangles, as part of the U.S. G eo 1 o g i c a 1 Survey's 

Heavy Metals Program. The B-4 and B-5 quadrangles, which are centered about 250 miles east 

of Anchorage (fig. 1), include parts of the southern 

Wrangell Mountains and the contiguous Chitina Valley. 

The landforms of the B-4 and B-5 quadrangles have 

been strongly modified by glaciation and range in altitude fr<.>m about 1 , 400 to 9, 265 feet. M o s t of the 

mountainous regions are sparsely covered by vegetation and have good outcrops, but bedrock in the lowlands is generally obscured by diverse vegetation and 

extensive surficial deposits. The investigators utilized 

helicopter support concomitantly with other geologic 

studies in the region. The fieldwork consisted of collecting 105 stream-sediment samples and 146 samples 

from veins, altered zones, and rocks. G. R. Winkler 

ably assisted in the sampling. The samples were sieved 

to -180 mesh and analyzed in U.S. Geological Survey 

laboratories for gold by atomic absorption methods and 

for 33 other elements by semiquantitative spectroscopy. In addition to sampling virgin outcrops, numerous samples were collected from mines and prospects 

to augment the study of the region's mineral deposits 

and the interpretation of the general sampling. Results 

of previous geologic studies in the B-4 andB-5 quadrangles are mainly incorporated in reports by Moffit 

and Capps (1911), Moffit (1938), andMacKevett(1965). 

GEOLOGY 

Geologic Setting 

The McCarthy B-4 and B-5 quadrangles are underlain largely by thick sequences of sedimentary and 

1 

volcanic rocks that range in age from Permian and 

Permian(?) to Cretaceous and by diverse Quaternary 

surficial deposits (fig. 2). The older rocks are cut by 

Tertiary intrusive rocks, and near the northeast corner of the B-4 quadrangle are overlain by Tertiary 

continental sedimentary rocks that contain intercalated lava flows. The pre-Cretaceous rocks mainly 

occupy a northwest-trending belt along the south flank 

of the Wrangell Mountains. The southern part of this 

belt is overlapped by Cretaceous marine sedimentary 

rocks and by surficial deposits, the northern part by 

volcanic rocks of the extensive Wrangell Lava. The 

oldest rocks in the quadrangles are submarine lava 

flows and their derivative volcaniclastic rocks, which 

together constitute the Station Creek Formation of 

the Sko1ai Group (Smith and MacKevett, 1968). These 

rocks are slightly metamorphosed and are probably 

Permian in age. They are conformably overlain by 

slightly metamorphosed fossiliferous Permian rocks, 

the Hasen Creek Formation of the Skolai Group (Smith 

and MacKevett, 1968). Triassic rocks are represented 

by a local thin remnant of unnamed Middle Triassic 

sedimentary rocks; by extensive basalt flows, the 

Nikolai Greenstone of late Middle and (or) early Late 

Triassic age; by Late Triassic carbonate rocks, the 

Chi tis tone and Nizina Limestones; and by carbonaceous 

shales, cherts, and impure limestones of the Late 

Triassic part of the McCarthy Formation. Early Jurassic rocks, chiefly spiculites and shales, of the 

upper member of the McCarthy Formation are sparsely distributed in thenorthernpartsoftheB-4 and B-5 

quadrangles. The pre-Cretaceous rocks were folded 

and faulted during the major orogeny of the region, 

near the close of the Jurassic or in the Early Cretaceous; most major structures are related to this period 

of deformation. Cretaceous clastic sedimentary rocks, 

largely of shallow marine origin, overlie the older 

rocks with a strong an g u 1 a r unconformity and are 

widely distributed throughout the southern parts of 

the B-4 and B-5 quadrangles (Jones and MacKevett, 

1968). Quaternary surficial deposits, largelyoffluvioglacial derivation, cover most low parts of the quadrangles. 

Intrusive rocks in the quadrangles include gabbro, 

granodiorite, and altered felsic hypabyssal rocks. 

The gabbro is Permian or Triassic in age, and is con~ 

fined to terrane underlain by Skolai Group rocks; it 
Figure 1.--Index map showing location of the McCarthy B-4 and B-5 quadrangles. 

generally forms small discordant or concordant plutons. The granodiorite is Tertiary in age and forms 

small discordant stocks near Williams, Andrus, and 

Pyramid Peaks (fig. 2). The hypabyssal rocks, the 

youngest intrusives in the quadrangles, are also Tertiary. They form small stocks and numerous dikes 

and sills that commonly cut Cretaceous rocks. Most 

of the hypabyssal rocks are porphyritic rhyodacite 

and dacite that in places have been extensively altered 

to clay minerals, sericite, and chlorite. Intruded rocks 

near the gabbro, in particular those adjacent to the 

granodiorite, have been metamorphosed, chiefly to 

hornfels. 

Hydrothermally altered zones, a few inches to 250 

feet wide, are common in the eastern part of the B-4 

quadrangle, where they are localized mainly along 

faults. The altered zones consist largely of copiously 

iron-stained yellowish- or reddish-brown leached or 

gougy material. 

For the purpose of this report, formations that contain similar rock types have been grouped as follows 

in figure 2 regardless of their geologic ages: 

1. All surficial deposits, such as alluvium, talus, rock 

glaciers, and diverse fluvioglacial deposits, and 

areas covered by glacier, snowfields, and water. 

2. Volcanic and volcaniclastic rocks that include rocks 

of the Nikolai Greenstone and Station Creek Formation and basal flows of Wrangell Lava. 

3. Detrital clastic rocks, mainly sandstone, shale, and 

mudstone. These rocks are largely Cretaceous, 

but they include subordinate Permian, Triassic, 

Jurassic, and Tertiary rocks. 

4. Carbonate rocks of the Chitistone and Nizina Limestones. 

2 

5. Gabbro. 

6. Intermediate intrusives, mainly granodiorite. 

7. Felsic intrusive rocks of Tertiary age. 

Summary of Economic Geology 

The general region is best known for the massive 

copper sulfide lodes at the Kennecott mines, which 

are mainly in the nearby McCarthy C...:.5 quadrangle. 

For many years before 1938, when large-scale mining 

ceased at Kennecott, these mines were among the 

world's premier copper producers with a total production of about 1.2 billion pounds of copper and a significant byproduct of silver. The Kennecott lodes formed 

near the base of the Chi tis tone Limestone within a few 

hundred feet of its contact with the subjacent Nikolai 

Greenstone. Several small copper mines and prospects 

are localized in the basal Chi tis tone strata in the B-4 

and B-5 quadrangles (fig. 2), but none have yielded 

significant production. Other copper deposits in these 

quadrangles consist of chalcopyrite, bornite, or chalcocite-rich veins in the Nikolai Greenstone, as exemplified by the Nikolai mine and the Radovan greenstone 

prospect, and of native copper and tenorite lodes localized between Nikolai G r e en s ton e flows and in amygdules at the Erickson mine (fig. 2). Production from 

these deposits has been negligible. Native copper is 

sparsely distributed in a few of the Nikolai Greenstone 

amygdaloids, and copper sulfides are scattered along 

a fault zone that cuts Chitistone-Limestone and Nikolai 

Greenstone at the Radovan low-contact prospect (fig. 

2). Chalcopyrite is a minor to trace constituent at the 

Taylor, Porphyry Mountain, and Crumb Gulch prospects (fig. 2). 
Gold valued at close to a mHlion dollars has been 

recovered from the placers of Dan and Chititu Creeks 

and their tributaries. The few known gold lodes are in 

Tertiary intrusive ro:ks or in adjacent hornfelsed 

Cretaceous rocks. 

Antimony has not been recovered from either the 

B-4 or the B-5 quadrangles, but stibnite is the major 

ore mineral of the Crumb Gulch lodes and a minor constituent of the Radovan low-contact prospect. 

Molybdenite occurs in a lenticular quartz vein cutting Tertiary intrusive rocks at the Porphyry Mountain prospect (fig. 2) and as a sparse constituent of 

a few small quartz veins that cut Cretaceous rocks 

south of Dan Creek. Molybdenite-quartz float is widespread in the moraines of Canyon Creek Glacier, but 

its lode source probably is in the McCarthy B- 3 quadrangle. 

Silver is associated with the copper-sulfide and copper-iron-sulfide lodes and with the native copper and 

gold deposits. No commodities other than the aforementioned are known to exist in potentially recoverable quantities in the mines and prospects of the McCarthy B-4 and B-5 quadrangles. 

Distribution of Metals 

The significant metals in the quadrangles, gold, copper, silver, antimony, molybdenum, and arsenic, are 

discussed with regard to their distribution in (1) previously known deposits, (2) virgin outcrops, including 

veins, altered zones, and rocks, and (3) stream sediments. Analytical data for the rock, veins, and altered 

zone samples are given in table 1; similar data for 

the stream-sediment samples are given in table 2. 

The sample locations are shown in figure 2. 

Samples from the known deposits do not necessarily 

represent the highest grade material available from 

the deposits. Several of these samples were taken 

to determine the extent of mineralized rock away from 

the lodes or to test structures that are not obviously 

mineralized. Most samples of rocks, altered zones, 

and veins were grab samples, although several chip 

or channel samples were taken at the mines and prospects and from the altered zones. The stream-sediment samples represent the finest grained material 

available at the sample site. Not enough sample information is available to determine adequately the 

background distribution of metals in the diverse rocks 

of the quadrangles. Consequently, the designation of 

anomalous values is somewhat arbitrary and is based 

on limited analytical data for the local rocks and on 

information obtained from the literature. 

Gold 

The highest concentration of gold, 66.0 ppm (parts 

per million), was detected in a channel sample (16).!/ 

from the prospect north of Crumb Gulch. A few other 

samples from this prospect also contained anomalous 

amounts of gold. Samples from other known deposits 

!/Numbers in parenthese refer to sample numbers 

given in table 1 or 2. 

3 

that contained abnormal concentrations of gold are 

from the Taylor prospect (as much as 15.4ppm (74)), 

and the Porphyry Mountain prospect. 

The richest sample from a deposit not previously 

known is from slightly altered Station Creek volcaniclastic rock collected northeast of Canyon Creek. 

This sample contained 5.2 ppm gold (103). Samples 

from altered zones near Canyon Creek (87, 108) and 

from stibnite-quartz veins north of Eagle Creek (63) 

contained gold in excess of 1 ppm. Several lesser gold 

anomalies, reflected by samples that contained between 

0.1 and 1 ppm gold, are from altered zones elsewhere 

in the quadrangles. 

Stream-sediment sampling detected small anomalous concentrations of placer gold in most of the main 

drainages. Samples from several of the streams that 

have been worked for placer gold and from which gold 

can be panned fairly readily yielded surprisingly low 

gold values. This is probably attributable to the vagaries of sampling and possibly to the size distribution 

of the placer gold. 

Some drainages not previously known to contain 

placer gold, such as those of Canyon and Toby Creeks 

and the Chitistone River, showedminorgoldanomalies 

in their stream sediments. The highest gold concentration detected in the stream-sediment samples, 9.6 

ppm (86), was from a stream along the north side of 

the Glacier Creek Glacier west of the Erickson mine. 

Copper 

Copper is the major valuable metal at most mines 

and prospects in the quadrangles. Many samples from 

copper deposits contained copper in excess of 20,000 

ppm, the upper limit reported in the analytical results. 

Undoubtedly, samples that contain similar quantities 

of copper could be obtained by selective sampling at 

any of the known copper deposits. Minor and probably 

insignificant amounts of copper were detectedin.samples from some of the prospects for other met a 1 s. 

Four deposits that contain p o s sib 1 y significant 

amounts of copper were found in Nikolai Greenstone 

terrane in the southeastern part of the B-4 quadrangle. 

The first of these deposits consists of secondary copper minerals that locally coat fractures in sheared 

greenstone adjacent to an altered zone 250 feet wide. 

A sample from this deposit contained 15,000ppm copper (91 ), but a composite grab sample from the altered 

zone revealed only negligible arriounts of ore metals 

(90). At the second locality, several narrow shear zones 

contain sporadically distributed secondary copper 

minerals. A sample of the richest appearing material 

in these zones carried 20,000 ppm copper (94). The 

third deposit comprises chalcocite and secondary copper minerals that form lntermittent fracture fillings 

throughout a fault zone 6 feet wide. A selected sample 

from this deposit carried more than 20,000 ppm copper (96). The fourth deposit contains secondary copper minerals throughout a mineralized zone 1-2 feet 

thick that is enclosed in a fault zone 15 feet thick. A 

sample from the mineralized zone contained more than 

20,000 ppm copper ( 108). 
:::> ~ 

a: l' 

~.,. 

APPROXIMATE MEAN 

DECLINATION, 1968 

EXPLANATION 

s 

Surficial deposits 

Includes moraine, alluvium, older alluvium, rock glaciers, talus, 

landslides, and fluvioglacial deposits; all of Quaternary age. 

Areas covered by glaciers, snow. or water are also included with 

the surficial deposits 

Felsic intrusive rocks 

Fine-grained altered felsic intrusive rocks of Tertiary age that form 

small plutons, mainly dikes a.nd sills 

Intrusive rocks of intermediate composition 

Chiefly medium-grained granodiorite of Tertiary age; form 

small stocks 

Mainly sandstone, shale, and mudstone, but include some conglomerate and rare limestone, spiculite, and clt.ert. Largely Cretaceous, 

subordinately Jurassic, TriaBBic. and Permian. Tlt.e Cretaceous 

rocks are metamorphosed to horrifels near some stocks 

Carbonate rocks 

Mainly limestone with subordinate dolomite and chert. lncltule 

Upper Triassic Chitistone and Nizina Limestones 

Volcanic rocks . Incltule flows and vokanicl.astic 

rocks of 'lllt.\fic to intermediate 

compositiml, generally weakly 

metamorphosed. Chiefl11 Triassic Nilwl.ai Greenstone and 

Permiax (?) Statiox Creek 

.Formatiml 

.. 

Gabbro 

Coarse- to medium-grained 

partly serpentixized gabbro 

of Permian or Triassic age. 

Forms concordaxt axd discoKCordant plutafts of diverse 

sizes 

Contact 

Dotted where oonceal.ed 

Fault 

Dashed where approximately located; 

dotted where concealed 

~ ........ . Thrust fault 

Dotted where concealed. 

Sawteeth on upper plate 

034 

Stream-sediment sample locality 

Sam,U data are given in table 2 

020 

Location of rock sample 

Sam,U data are given in table 1 

'760 

Location of sample from 

zone, mineralized rock, or vein, not 

at a mine or prospect 

Sam,U data are given in table 1 

X 1(AuJ 

Lode proepeet 

Main commodity iftdicated by clt.emical 

symbol. Samples iftdicated by xumbers 

and described in table 1 

(Cu} 

Lode mine 

Main commodity ixdicated by chemical ~ac~a~~~; ~~!: ~~~.or~~~ Survey 1:63•

360 

31/1fl.bol. Samples iftdicated by xumbers 

aftd described ix table 1 

·. 

Figure 2.--Generalized geologic map showing quadrangles, 

4 
Geology generalized from mapping by E. M. MacKevett, Jr.', and R. l. Applegate, 1964 

(McCarthy B-5 quadrangle); E. M. MacKevett, Jr., 1965, 1967; D. L. Jones, 1965; 

J. G. Smith and G. R. Winkler, 1967 (McCarthy B-4 quadrangle) 

E===c===EO=======C=======i======ae======~4 MILES 

sample locations in the McCarthy B-4 and B-5 

Alaska. 

5 
Two copper deposits were found in the northeastern 

part of the B-4 quadrangle. One consists of spottily 

distributed azurite and malachite in a fault zone 1-4 

feet thick that cuts the Nikolai Greenstone. A sample 

selected from the copper-enriched part of the fault 

zone contained 20,000 ppm copper ( ll1 ). The other 

deposit consists of copper-stained patches that are 

scattered throughout an altered au reo 1 e of Station 

Creek volcaniclastic rocks contiguous to a gabbro 

pluton. A composite grab sample representative of 

the mineralized patches contained 20,000 ppm copper 

(129). A few other samples from altered zones in the 

B-4 quadrangle carried minor anomalous amounts of 

copper. 

Native copper is concentrated in some of the gold 

placers of the region, generally in the form of small 

nuggets, but rarely as large slabs weighing from 

several tens to several hundred pounds. The placer 

deposits, however, probably do not contain enough copper to be exploited. 

Many of the stream-sediment samples contained 

anomalous amounts of copper in concentrations· of as 

much as 300 ppm. Most of the anomalous samples were 

from Toby Creek and from Glacier Creek and its tributaries. 

Silver 

Silver is chiefly associated with the copper deposits 

of the region. Except for the uncommon native silver 

associated with native copper, no discrete silver minerals were recognized in the deposits. The highest detected silver concentration, 100 ppm, was in a sample 

of float collected below the Radovan low-contact prospect ( 40). The second richest silver sample, from the 

native copper-tenorite lode at the Erickson mine, contained 70 ppm silver (142). Some samples from the 

Nelson prospect, Westover mine, the Radovan greenstone prospect, and theprospectwestofBoulderCreek 

contained 50 ppm silver(29-33, 45, 46, 48). Other samples from these and other known copper deposits, from 

the prospect north of Crumb Gulch, and from the Taylor 

prospect carried lesser anomalous amounts of silver. 

The highest silver content detected in the newly found 

deposits, 50 ppm, was from a copper deposit in the 

southeastern part of the B-4 quadrangle ( 1 08). Samples 

from the other copper deposits found in the eastern 

part of the B-4 quadrangle carried subordinate 

amounts of silver. 

Four of the stream-sediment samples contained 

anomalous amounts of silver. The highest silver concentration, 5 ppm, was in a sample from G 1 a c i e r 

Creek below the Erickson mine(85). Samples that contained 0. 7 ppm silver were collected from the Chitistone River near the northern border of the B-4 quadrangle (73), from Toby Creek (79), and from Rader 

Gulch, a tributary of Dan Creek (105). 

Antimony 

Stibnite is the major ore mineral at the prospects 

north and south of Crumb Gulch. It occurs mainly in 

6 

veins localized in a contact-metamorphic aureole of 

Cretaceous shales that have been converted to hornfels, or less extensively, in veins that cut granodiorite. Several samples representative of the veins at 

the Crumb Gulch prospects contained more than 10,000 

ppm antimony, the upper limit thatwas reported in the 

analyses ( 13, 14, 17 -19). Stibnite has been reported 

from veins at the Radovan low-contact prospect (Sainsbury, 1951, p. 15), and tetrahedrite probably is a rare 

constituent of many of the copper lodes. 

Several subparallel stibnite-quartz veins as much 

as 2 feet thick and a few antimony-bearing altered 

zones as much as 6 feet thick were found cutting Nizina 

Limestone north of Eagle Creek. The stibnite forms 

scattered needlelike cry s t a 1 s or local high-grade 

masses in the veins. The extent of the veins along their 

strikes could not be determined because of surficial 

cover. Samples representative of the higher grade 

parts of these deposits contained more than 10,000 

ppm antimony (62, 65, 66). A sample of altered material from a fault zone, 10 feet wide, cutting Nizina 

Limestone north of Texas Creek contained 1,500 ppm 

antimony (55). Samples from several other altered 

zones and from a few mines and prospects contained 

between 100 and 200 ppm antimony. A sample of mineralized breccia float collected from Texas Creek 

contained more than 10,000 ppm antimony (59). No 

anomalous concentrations of antimony were found in 

any of the stream-sediment samples. 

Molybdenum 

The only significant concentrations of molybdenum 

were in samples from the Porphyry Mountain molybdenum-gold prospect. At this prospect, molybdenite 

forms large flakes that generally are localized along 

selvages of a lenticular quartz vein that cuts Tertiary 

intrusive rocks. Most samples from the Porphyry 

Mountain prospect contained molybdenum in excess 

of 2,000 ppm, the highest concentration reported in 

the analyses ( 1-3, 6, 7). Molybdenum in amounts between 7 and 50 ppm was reported in samples from 

many of the mines, prospects, and altered zones of 

the region. A float sample of altered hornfels laced 

with quartz veinlets that was co 11 e c ted on a rock 

glacier southeast of Andrus Peak contained 100 ppm 

molybdenum (83). 

Five of the stream-sediment samples contained 5 

or 10 ppm molybdenum. Two of these samples are 

from tributaries of the Chi tis tone River near the western boundary of the B-4 quadrangle (60, 64). One is 

from a tributary of Canyon Creek (136), and the two 

others are from the headwaters of Young Creek (141, 

142). 

Arsenic 

Anomalous amounts of arsenic were detected in 

samples from many of the known mines and prospects 

and from a few of the altered zones. Several samples 

from the Crumb Gulch antimony-gold prospects, where 

realgar and subordinate orpiment are localized in the 

veins, contained arsenic in excess of 10,000 ppm, the 
highest concentration reported in the analyses ( 14-17, 

19). A sample from the Nelson prospect also contained 

more than 10,000 ppm arsenic and probably indicates 

enargite and tennantite in the deposits (31). Other high 

concentrations of arsenic were found in samples from 

the Westover mine, where arsenic probably is a constituent of sulfosalts, from the Radovan low-contact 

prospect, which contains realgar, and from a copper 

prospect south of Nikolai Butte (52). 

The richest arsenic sample from a deposit notpreviously known contained 7,000 ppm arsenic; this sample was from a copper deposit in sheared N i k o 1 a i 

Greenstone (91). Only two of the stream-sediment samples revealed anomalous amounts of arsenic. One, 

from Toby Creek near its junction with the Chitistone 

River, contained 700 ppm arsenic (72); the other, from 

Rader Gulch, contained 300 ppm arsenic. 

Other metals 

Minor anomalous concentrations of many of the other 

metals that were sought in the semiquantitative spectrographic analyses were found both in mineralized 

rock samples and stream-sediment samples. Probably 

the most significant of these anomalous concentrations 

is tungsten that is associated with antimony deposits 

at the Crumb Gulch prospects and north of Eagle Creek. 

A sample from the prospect south of Crumb Gulch contained 10,000 ppm tungsten ( 19), and a sample from the 

stibnite-rich veins north of Eagle Creek contained 

7,000 ppm tungsten (65). 

A selected sample from a narrow altered zone in 

basal Chi tis tone Limestone at a copper prospect south 

of Nikolai Butte yielded 15,000 ppm lead, 10,000 ppm 

zinc, and 300 ppm cadmium (52). 

SUMMARY AND SUGGESTIONS FOR PROSPECTING 

The McCarthy B-4 and B-5 quadrangles contain 

numerous copper deposits, many of which carry subordinate amounts of silver, and a few deposits of gold, 

antimony, molybdenum, and arsenic. The geochemical 

and related geological investigations in the quadrangles 

provide additional information on the distribution of 

metals in known deposits as well as data on the newly 

found deposits. The investigations also indicate a few 

areas that probably merit additional examination. 

Samples from some of the knovin deposits revealed 

concentrations of a few metals not previously reported, 

such as tungsten at the Crumb Gulch prospects and 

lead and zinc at a prospect south of Nikolai Butte. The 

apparently most significant of the previously unknown 

7 

deposits are the copper lodes in the eastern part of the 

B-4 quadrangle and the stibnite lodes north of Eagle 

Creek. Our investigations do not provide adequate data 

on th~ size and grade of these deposits nor accurate 

appraisals of their potentials. Some of these deposits 

may justify further examinations. Other potential exploration targets in the B-4 quadrangle are the numerous altered zones, some of which are extensive, 

and the basal conglomerate of the Nikolai Greenstone, 

which contains abundant pyrite. Most of our samples 

from the altered zones and the conglomerate had low 

metal contents, but detailed sampling might disclose 

altered zones or parts of the conglomerate that have 

economic potential. 

The minor gold anomalies in streams not previously 

known to contain placer gold, such as Toby and Canyon 

Creeks and the Chitistone River, and in altered rocks 

from near Canyon Creek, might warrant addition a I 

study as possible clues to large, low-'grade bedrock 

gold sources. Likewise, more thorough streamsediment sampling of the drainages of Toby, Canyon, 

and Glacier Creeks may lead to the discovery of additional copper deposits. Additional sam p 1 in g and a 

thorough assimilation of all available sam p 1 e data 

could conceivably disclose pathfinder elements that 

would aid in prospecting the region. 

REFERENCES CITED 

Jones, D. L., and MacKevett, E. M., Jr., 1968, Summary of Cretaceous stratigraphy in pari: of the 

McCarthy quadrangle, Alaska: U.S. Geol. Survey 

Bull. 1274-K (in press). 

MacKevett, E. M., Jr., 1965, Preliminary geologic 

map of the McCarthy B-5 quadrangle, Alaska: U.S. 

Geol. Survey Misc. Geol. Inv. Map I-438, s c a I e 

1:63,360. 

Moffit, F. H., 1938, Geology of the Chitina Valley and 

adjacent area, Alaska: U.S. Geol. Survey Bull. 

894, 137 p. 

Moffit, F. H., and Capps, S. R., 1911, Geology and mineral resources of the Nizina district, Alaska: U.S. 

Geol. Survey Bull. 448, 111 p. 

Sainsbury, C. L., 1951, Geology of the Nelson and 

Radovan copper prospects, Glacier Creek, Alaska: 

U.S. Geol. Survey open-file report, Oct. 1951, 18p. 

Smith, J. G., and MacKevett, E. M., Jr., 1968, The 

Skolai Group in the McCarthy B-4, C-4, and C-5 

quadrangles, Wrangell Mountains,· A 1 ask a: U.S. 

Geol. Survey Bull. 1274-Q (in press). 
Table 1.--Analrses of rocks, altered zones, and lodes 

[Analyses by semiquantitative spectrographic methods, except for Au which was analyzed by 

0.5, 0.3, 0.2, 0.15, 0.1, and so forth, N, not detected; L, detected but below limit of 

by C. L. Forn, D. J. Grimes, R. T. Hoskins, and E. L. Moiser. Atomic absorption analyses 

Looked for, but not detected: Cd, Hg, La, Pd, Pt, Ta, and Te; exceptions: Cd, 300 ppm in 

and 140; 20 ppm in several other samples. Sample locations shown in fig. 2. Sc was 

Sample Lab. Field Parts per million 

No. No. 

ACI- Ag As Au B Ba Be Bi Co Cr Cu Mo Mn Nb 

1 027 67AMKSS L 200 0.2 L 20 N N N N 15 >2,000 10 10 

2 028 56 L L .3 L 200 L N N N 20 >2,000 100 L 

3 029 57 0.5 L <.02 10 200 1 10 5 N so >2,000 70 L 

4 030 58 L 200 . 2 10 30 N 10 N N 15 2,000 20 L 

5 031 59 L 200 . 6 10 10 N L N N 30 500 30 L 

6 032 60 1 200 2.4 10 30 N 10 N N so >2,000 so L 

7 033 61 1 L . 9 10 30 N N N N 100 >2,000 15 L 

8 009 .2+23 N N <.02 15 70 N N so 500 so 7 1,000 10 

9 082 67ASj228 3 N .02 10 so L N so 30 10,000 N 1,000 L 

10 083 229 5 N .04 L 20 N N 70 30 >20,000 N 1,000 L 

11 084 230 L N <.02 10 N N N 15 10 100 N 500 L 

12 115 67AWK60 so N .1 10 70 N N 70 30 >20,000 10 1,000 L 

13 061 67AMK99 1 7,000 3 150 700 L N 10 70 20 7 700 10 

14 062 100 2 >10,000 11 so 500 N N 5 30 30 5 so L 

15 063 101 15 >10,000 2.8 so 500 N N so so 200 N 500 L 

16 064 104 1.5 >10,000 66.0 150 700 1 N 5 70 30 10 70 10 

17 058 93 N >10,000 .08 70 700 1 N 15 so so 10 700 10 

18 059 95 N 10,000 .1 70 700 1 N 20 30 so 20 700 10 

19 060 98 N >10,000 . 2 70 500 1 N 5 30 20 30 1,000 70 

20 146 67ASj294A N N <.02 30 700 1 L 10 20 100 N 1,000 L 

21 126 67AMK230 N 2,000 .03 N >5,000 N N 100 so 100 N 1,500 L 

22 144 67AWK120 N N <.02 20 so N N 70 200 300 5 1,500 10 

23 140 67AMK242 1 200 .03 N 15 N N N 20 500 N 700 N 

24 143 271 L N .04 150 150 N N 10 70 200 5 100 10 

25 136 237 N 500 <.02 N 10 N N 5 N 1,500 N 200 L 

26 094 188 1 1,000 .1 N 20 N N 10 30 2,000 N 500 N 

27 092 186 N N <.02 10 so N N 70 200 100 N 700 L 

28 093 187 1.5 N <.02 L so N N 50 100 500 N 700 L 

29 137 248 50 N . 2 N N N N N N >20,000 5 50 L 

30 138 250 so 3,000 .1 N N N N N N >20,000 10 100 L 

31 139 252 so >10,000 .1 N 20 N N 5 10 >20,000 5 200 L 

32 068 130 so 2,000 . 2 10 10 N N 30 7 >20,000 5 200 L 

33 069 131 50 2,000 .1 N <10 N N 100 N >20,000 5 200 L 

34 070 132 20 500 .1 15 30 L N 15 15 >20,000 N so L 

35 065 110 L 500 • 2 N 20 N N N 30 20 N 150 N 

36 034 69 N 1,000 • 2 10 30 N N N 20 7 20 150 L 

37 163 302 N N N 50 15 N N so 150 500 N 500 L 

38 164 303 3 2,000 N 20 30 N N 10 70 >20,000 7 300 L 

39 165 304 N 700 N 70 30 N N 30 150 700 N 500 L 

40 166 305 100 N N L 70 N N 30 150 >20,000 N 1,000 L 

41 156 278 N N N L 10 N N 30 200 30 N 700 L 

42 155 277 N N N L 7 N N 20 100 70 N 700 L 

43 128 67ASj277 3 N .01 20 L N N 30 30 10,000 N 1,500 L 

44 129 278 3 N <.02 20 20 N N 50 50 >20,000 N 2,000 L 

45 095 67AMK196 50 N <.02 10 N N N 30 30 >20,000 N 700 L 

46 096 197 50 N .OS 20 L N N 50 50 >20,000 s 1,000 L 

47 097 199 30 N .03 so N N N 10 5 >20,000 N 700 L 

48 098 201 50 N .07 1S L N N 30 30 >20,000 5 1,000 L 

49 02S 49 N N . 2 N N N N N 10 10 N 200 N 

so 180 347 1 N <.02 10 7 N N 1SO 200 >20,000 N 1,000 10 

See description of samples on pages 14-16. 

8 
from the McCarthr B~4 and B~S guadrangles 2 Alaska 

atomic absorption methods. Analyses reported to the nearest number in the series 1, 0.7, 

determination; >, greater than; <' less than. Semiquantitative spectrographic analyses by w. L. Campbell, A. L. Meier, R. L. Miller, M. s. Rickard, T. A. Roemer, and R. B. Tripp. sample 52; La, 50 ppm in samples 127, 132, and 138; 30 ppm in samples 63, 85, 87, 103, 125, 

detected in amounts between 5 and 30 ppm in most samples] 

Parts per million--Continued Percent Sample 

Ni Pb Sb Sn Sr v w y Zn Zr Hg Fe Ca Ti 

L N N 30 N 10 100 N N N 0.02 0.1 0.1 0.02 1 

L N N 30 100 20 100 N N 30 . 2 . 7 .3 .1 2 

5 L N 30 100 20 L N N 30 .OS 1 .3 .1 3 

L N N 20 N 10 N N N N .02 .07 .1 .01 4 

L N N N N 10 N N N N .02 .1 .OS .01 5 

L N N 30 N 15 100 N N N .02 .15 . 5 .02 6 

L N N 15 N 15 N N N N .02 . 2 .07 .02 7 

100 N 100 N N 300 N 15 N so 5 15 1 . 7 8 

30 L N N N 200 N 20 N so 3 10 7 1 9 

so 10 N N N 300 N 30 N 70 3 15 7 1 10 

15 N N N 100 70 N 10 N 30 1 3 7 .3 11 

50 20 N N 150 300 N 20 N so 2 15 5 1 12 

30 15 >10,000 N 200 200 so 15 N 70 1 7 2 . 5 13 

10 15 >10,000 N 150 70 N N N 30 . 2 3 . 7 . 2 14 

so 20 700 N 150 100 N 10 200 so 1 15 3 . 2 15 

15 15 5,000 N 100 150 N 15 N 70 . 5 10 . 2 . 5 16 

30 L >10,000 N 150 100 so 20 200 70 1 5 . 5 . 3 17 

30 L >10,000 N 100 100 300 15 N 50 . 2 3 . 2 . 2 18 

15 N >10,000 N 200 100 10,000 15 N 20 . 3 5 .15 . 2 19 

15 15 N N 500 70 N 10 N 100 1.5 5 5 . 2 20 

500 30 N N 500 30 N 10 N N 2 >20 >20 . 2 21 

so N N N 150 300 N 30 N 70 ·s 15 7 1 22 

10 L N N 700 30 N N N 20 1.5 .1 >20 .03 23 

20 10 N N 2,000 200 L 50 N 150 . 5 10 . 5 >1 24 

10 10 N N 500 30 N N N 20 . 7 1 >20 .03 25 

19 L N N 500 150 N 15 N 20 1 2 >20 .07 26 

so L N N 200 500 N 30 200 70 5 10 7 . 7 27 

so 20 N N 100 200 N 15 N 30 2 15 2 . 5 28 

N 10 N N 200 15 N N N N 3 . 2 20 .01 29 

N 10 N N 300 15 so N N 10 5 . 5 20 .01 30 

10 15 N N N 50 so N N 15 . 7 . 2 3 .OS 31 

30 15 N N N 30 N N 200 20 .07 5 2 .OS 32 

100 20 N N N 30 N N 500 30 .02 7 . 2 .03 33 

15 10 N N N 50 N N N 70 . 2 2 1 .15 34 

10 L 100 N 300 so N L N 10 >10 2 >20 .OS 35 

5 N 150 N 1,000 so N 15 N N .3 . 7 20 .03 36 

70 N N 20 100 200 70 20 N 70 1.5 7 2 . 5 37 

30 N N 15 so 100 N 15 N 30 . 7 15 1.5 . 3 38 

70 N N 30 70 300 so 30 N 70 . 5 15 2 . 7 39 

70 N N 30 70 150 N 15 N 30 2 7 2 . 5 40 

70 N N N 100 200 N 15 N 70 2 7 5 . 5 41 

30 N N :N 100 70 N 15 N 20 1.5 5 10 . 2 42 

30 L N N N 300 N 15 N 30 1.5 10 10 . 7 43 

so L N N 100 300 N 20 N 30 7 20 10 1 44 

30 N N N N 150 N 15 N 30 1 7 3 . 3 45 

so L N N N 200 N 20 N 30 2 10 5 .3 46 

10 N N N N 70 N L N 10 . 7 3 10 .1 47 

20 L N N N 150 N 15 N so 1.5 10 7 .3 48 

5 L N N 700 30 N L N 10 1 1 >20 '.02 49 

100 70 N N 70 300 N 30 N 70 1..5 10 2 .7 so 

9 
Table 1.-~Analrses of rocks 2 altered zones, and lodes from 

Sample Lab. Field Parts per million 

No. No. 

ACI- Ag As Au B Ba Be B1 Co Cr Cu Mo &in N6 

51 179 67AMK'346 N N <0.02 100 70 1.5 N 10 150 500 N 500 N 

52 178 345 10 7,000 <.02 L 20 L N 150 15 1,000 30 200 N 

53 045 67AWK42 30 N <.02 L L N N 20 30 >20,000 10 500 L 

54 022 67AMK39 N 200 <.02 10 50 N N N 30 5 N 100 N 

55 023 41 N 300 <.02 10 30 N N N 30 7 N 100 N 

56 175 340 N N <.02 20 20 N N 20 100 300 N 700 10 

57 176 341 N N <.02 50 30 N N 15 200 200 15 1,000 N 

58 177 342 N N <,02 20 30 N N 50 150 500 5 700 N 

59 019 31 N 500 <.02 10 30 N N N 15 15 10 150 L 

60 018 29 L 200 <.02 15 100 N N N 50 10 N 200 L 

61 017 22 . 5 N <.02 L 15 N N 15 30 20 N 500 L 

62 015 11 N 700 .1 10 300 N N N 30 20 7 100 10 

63 035 67AWK40-l N N 1.2 15 700 L N 7 30 15 20 500 L 

64 036 40-2 N L . 2 20 300 L N 15 20 20 10 500 L 

65 013 67AMK9 N 700 . 2 10 SO' N N N 10 10 15 50 20 

66 014 10 N 500 .1 10 so L N N 5 70 30 100 10 

67 012 8 N N <.02 30 70 N N N 70 30 N 30 15 

68 026 52 N 500 . 2 30 30 N N N 20 10 N 30 10 

69 010 3 N N <,02 20 200 L N so 30 150 N 1,500 L 

70 147 67ASj297 2 N .03 20 500 1 L 5 15 700 N 200 L 

71 049 174 . 5 N <.02 10 200 L 10 20 50 500 20 1,500 L 

72 050 175 . 7 N <.02 L 20 L 10 50 30 2,000 10 1,000 L 

73 051 176 N N <.02 10 500 1 N 20 30 50 5 700 L 

74 052 177 . 5 N 15.4 10 150 L 50 10 100 200 30 1,500 L 

75 053 178 5 N 5.0 10 70 L N 15 30 2,000 10 1,500 L 

76 054 179 N N 3.2 10 150 L N 10 100 50 20 2,000 L 

77 112 67AMK212 1 N <.02 10 700 L N 15 30 200 10 500 L 

78 113 213 1 N .1 20 200 L 70 50 so 1,500 20 2,000 10 

79 114 214 5 N 6.8 10 100 N 20 5 20 500 10 1,000 L 

80 122 67AWK99A N N <.02 10 500 1 N 20 70 30 N 1,000 10 

81 123 99B N N .03 15 1,000 1 N 15 70 50 N 700 10 

82 124 99C N N .03 10 700 L N 15 100 so 7 500 10 

83 125 99D N N .1 1,000 1,000 1 N 50 100 100 100 700 10 

84 120 98E N N .07 10 1,000 L N 30 70 70 N 700 L 

85 121 98H N N <.02 so 700 1.5 N 5 5 20 N 700 10 

86 011 67AMK6 N 500 <.02 20 10 N N 50 30 30 N 1,500 L 

87 021 67ASj95C N N <.02 150 300 1.5 N N 5 10 N 700 10 

87* 038 95C N N 3.6 50 70 L N 10 L 30 N 700 L 

88 008 19B N N <.02 20 100 N N so 300 30 N 1,500 L 

89 057 182 N N .02 30 20 N N 70 300 100 N 1,000 L 

90 055 180B N N .04 10 15 L N 20 70 70 N 1,000 L 

91 056 180C 2 7,000 .04 70 10 N N 30 70 15,000 N 700 L 

92 078 186B N N <.02 50 150 L N so 50 300 5 1,000 10 

93 048 171 N N <.02 50 50 L N 50 ISO 100 N 700 L 

94 047 169B 2 300 <.02 30 200 L N 20 50 20,000 N 700 L 

95 042 161 N N .02 70 300 1 N 70 200 200 N 1,000 L 

96 004 15A 7 1,000 <.02 10 10 N N 30 100 >20,000 N 1,000 10 

97 oos 16 N N . 4 30 10 N N 30 70 200 N 1,000 10 

98 003 13 N N <.02 L 20 L N 50 70 200 N 1,000 L 

99 002 11 N 200 <.02 70 100 L N 70 200 70 N 2,000 10 

100 001 9 N N <.02 30 1,000 L N so 200 so N 1,000 10 

101 007 18C N N <.02 so 3,000 N N so 150 70 N 1,000 L 

102 006 18A . s 200 <,02 20 1,000 L N s IS so so 1,000 10 

103 020 8S L N 5,2 30 soo 2 N 20 30 20 N 700 10 

103 * 037 85 N N . 8 so soo 2 N 15 IS 30 s 700 10 

*Duplicate. 

10 
the McCarthz: B-4 and B-5 guadrangles, Alaska--Continued 

Parts per million--Continued Percent Sample 

Ni Pb Sb Sn Sr v w y Zn Zr Mg Fe Ca T1 

100 so N N L zoo N so 1,000 150 1 7 0.2 1 51 

300 15,000 N N L 20 N N 10,000 20 .15 15 3 .07 52 

10 100 N N 150 70 N N N 20 . 3 15 2 .15 53 

10 L N N 1,500 70 N 10 N 10 . 3 . 7 >2o .OS 54 

15 L 1,500 N 1,000 so N 10 N 20 . 3 1.5 >2o .07 55 

so 30 N N 150 70 N 10 N 30 5.0 3.0 10 .3 56 

100 L N N 200 300 N 30 N 70 1.5 5.0 5 . 5 57 

70 10 N N 300 300 N 20 N 70 1.5 7.0 5 . 5 58 

10 10 >10,000 N 500 20 N N N 10 . 5 . 7 20 .02 59 

15 L 150 N 300 70 N 10 N 20 . 5 1.5 20 .07 60 

so L N N 500 100 N 20 N 20 . 5 10 20 .1 61 

10 N >10,000 N 200 70 500 10 N 30 .OS 2 . 2 . 5 62 

20 L N N 500 100 N 15 N 100 1.5 3 3 . 3 63 

30 L 100 N 200 70 N 10 N 20 2 3 7 . 2 64 

5 N >10,000 N 300 10 7,000 10 N 10 .03 1 1 .1 65 

7 N >10,000 L 150 10 500 N N 10 .03 . 7 . 2 .03 66 

7 L N N 300 200 so 10 N 150 .15 10 1.5 >1 67 

10 N 200 N 500 so 100 N -N 100 .07 2 . 5 . 3 68 

so L N N 150 200 N 20 L 30 3 15 20 . 5 69 

5 10 N 10 200 so N N N 70 1 5 .1 . 2 70 

30 N N N 150 100 so 15 N 30 1.5 15 7 . 2 71 

so N N N 100 so N 15 N 20 1.5 >20 5 .1 72 

20 L N N 500 100 N 15 N 150 1.5 5 5 . 3 73 

20 L N 20 300 200 N 20 N 70 2 15 15 . 3 74 

15 N N N N so so 10 N 20 1.5 15 10 .1 75 

20 L N N 200 150 N 20 N so 2 15 15 .3 76 

30 10 N N 500 100 N L N 200 2 5 3 .3 77 

30 N N N 150 100 N 10 N 30 1.5 20 20 . 2 78 

5 N N N N 70 N L N 30 . 7 20 7 .15 79 

20 15 N N 200 150 N 15 N 70 3 7 5 . 5 80 

20 15 N N 500 150 N 15 N 100 2 7 2 . 5 81 

so L N N 300 200 N 20 N 100 3 10 5 . 5 82 

so N N N 700 200 N 20 N 150 2 10 3 . 5 83 

20 L N N 200 150 N 15 N 70 2 7 2 .3 84 

5 15 N N 500 so N 10 N 100 1.5 5 3 .3 85 

so L 100 N 150 200 N 30 N 30 1.5 10 20 . 5 86 

5 10 100 N 300 20 N 20 N 200 . 7 3 5 . 3 87 

15 10 N N 150 30 N L N so 2 3 7 .1 87* 

100 L 100 N 150 200 N 15 N 20 5 10 10 . 5 88 

so L 150 N 150 200 N 20 N 30 3 10 15 . 5 89 

30 L 100 N 150 100 N 10 N 30 7 7 15 .3 90 

30 N N N 150 200 N 20 N so 2 10 10 . 7 91 

so L 150 N 150 200 N 20 N so 5 10 15 . 7 92 

so N 150 N N 200 so 20 N so 1.5 10 7 1 93 

30· N N N 700 200 N 15 N 30 1.5 10 10 . 5 94 

70 L 200 N 100 300 70 20 N 70 2 15 5 1 95 

70 N 100 N N 200 N 15 N so 3 10 7 • 7 96 

70 N N N 100 200 L 20 N 70 2 15 10 1.0 97 

70 L 150 30 150 200 N 15 N 10 5 10 20 . 2 98 

100 L 200 N 100 300 N 30 N 100 1.5 15 2 1 99 

70 L 150 N 150 200 N 15 N so 2 15 7 1 100 

70 N N N 200 300 N 20 N so 2 10 3 1 101 

so 20 N N 150 200 N 20 200 30 .15 2 . 5 .15 102 

20 10 100 N 100 150 N 30 N 150 . 7 10 3 . 5 103 

5 L L N. 100 70 N 30 N 150 . 7 7 5 . 5 103* 

*Duplicate 

Il 
Table 1.~-Anallses of rocks 2 altered zones, and lodes from 

Sample Lab. Field Parts per million 

No. No. 

ACI- Ag As Au B Ba Be Bi Co Cr Cu Mo Mn Nb 

104 039 67ASj97 N N <0.02 20 70 N N 30 100 100 N 700 L 

lOS 046 96 N N < .02 70 100 N N so 70 300 N 1,000 L 

106 161 31S N N N 30 lSO N N 20 70 lSO N 1~000 L 

107 162 316 N N .02 so 700 N N 30 200 100 N 700 L 

108 040 133 so N 1.3 lS so N N 20 100 >20,000 N soo L 

109 016 67AMK19 L N <.02 10 300 N N so 300 100 s 1,000 L 

110 079 67ASjl96A L N <.02 20 70 N N 70 200 100 s 1,000 10 

111 116 67AWK64 2 soo <.02 10 10 L N 10 so 20,000 N 700 L 

112 118 87 N N <.02 30 20 L N 100 so 100 N 3,000 L 

113 119 88 N N <.02 100 10 N N 70 70 100 N 1,000 L 

114 14S 127A N N .03 70 700 1 N so 70 so 7 1,000 10 

11S 109 67ASj267 N soo <.02 200 700 L N 70 300 100 s 3,000 L 

116 13S 293 N N .02 100 70 N N 70 100 300 N 2,000 10 

117 134 292 L N <.02 so 1,000 N N 70 lS soo N 2,000 L 

118 107 266B N N <.02 70 soo L N lS N 20 N 2,000 L 

119 108 266C N N <.02 30 300 L N 70 300 1SO N 2,000 10 

120 110 268A N N <.02 70 3,000 L N 10 N 20 N 2,000 L 

121 130 280 N N .04 70 1,sbo N N so 100 100 N l,SOO L 

122 104 247 N N <.02 so 200 L N 30 70 100 N 2,000 L 

123 103 246A N N <,02 lS 2,000 L N so 30 so N 2,000 L 

124 132 28SA L N <.02 100 2,000 L N 70 100 100 N 2,000 10 

12S 127 274B 1 N .06 so soo s N so 1SO 30 N l,SOO 10 

126 133 290A N N <.02 20 200 2 N 70 so so s 3,000 L 

127 111 270C N N <,02 10 700 3 N lS 20 100 N 1,000 so 128 099 232B N N .04 so 70 L N so 7 200 s l,SOO L 

129 117 67AWK77 2 N .06 30 200 L N 100 s 20,000 N 2,000 L 

130 lSO 67ASj303A N N <.02 70 soo L N 20 300 so s 1,000 10 

131 1S1 303B N N <.02 so 200 L N 30 200 so s l,SOO 10 

132 1S2 304A N N <,02 so 700 3 N 10 s 300 s 2,000 20 

133 131 282 . s N <,02 30 soo L N 70 100 100 s l,SOO 10 

134 043 164 L N <.02 20 soo L N 30 70 lSO N 1,000 L 

13S 044 16S N N .02 30 200 L N 30 70 1SO N 1,000 L 

136 100 236 L N <.02 20 700 L N so 100 100 7 1,000 10 

137 101 237 N N <.02 20 1,000 L N so 70 100 N 2,000 L 

138 102 240B L N <.02 20 700 l.S N 10 20 100 N 1,000 20 

139 .lOS 264B N N <.02 10 2,000 L N lS 20 so N 1,000 L 

140 106 26S N N <.02 10 1,000 L N 10 s so lS soo L 

141 148 298 L N <.02 20 so N N 70 300 soo N 2,000 10 

142 172 32S 70 N N N 30 N N 30 lSO >20,000 N 1,000 L 

143 173 326 20 N N N 20 N N 30 200 >20,000 N l,SOO L 

144 174 327 7 N <,02 10 L N N so 300 20,000 N l,SOO 10 

14S 167 67AMK318A 15 N N N 10 N N so 300 >2o,ooo N 2,000 L 

146 168 318B 30 L N N 20 N N 20 1SO >20,000 N l,SOO L 

Limit of 

o.s 200 0,02 10 s 1 10 s s s s 10 10 

12 
the McCarthy B-4 and B-S quadrangles,. Alaska--Continued 

Parts per million--Continued Percent Sample 

Ni Pb Sb Sn Sr v w y Zn Zr Mg Fe Ca Ti 

so N 100 N 100 300 N 20 N 70 2 10 7 >1 104 

so N N N 100 300 N 20 N 30 l.S 10 7 . 7 lOS 

30 N N N 70 200 N lS N 70 l.S 7 3 . 7 106 

70 N N N 200 300 N 20 N 100 l.S 7 3 . 7 107 

so L 100 N 100 lSO N 20 N 70 l.S s 3 . 7 108 

100 L 100 N 1SO 300 N 20 N 30 3 10 s . s 109 

70 L N N 100 200 N 20 N 70 3 lS 10 1 110 

20 N N N 700 200 N 20 N so 3 10 20 . s 111 

100 N N N 200 lSO N 20 N 30 7 20 20 . 2 112 

70 L N N N soo N 20 N so 3 1S 7 1 113 

so 10 N N soo lSO N 30 200 100 3 10 10 . 7 114 

100 L N N 300 200 N 30 N so s 20 20 . 7 llS 

100 L N N 200 soo N 20 200 so 7 1S 10 1 116 

100 20 N N 300 300 N 20 L so 7 1S 10 . s 117 

s L N N soo 100 N 30 N 100 2 10 7 . s 118 

100 L N N 200 700 N 30 N 200 s lS 10 > 1 119 

s lS N N soo 70 N 20 soo 30 s 7 lS . 2 120 

so L N N 200 300 N 20 L so 2 lS 10 . s 121 

30 10 N N ISO ISO N 20 N so s 10 10 . s 122 

so N N N ISO 1SO N lS N 20 3 lS 10 . 2 123 

70 10 N N 300 soo N 20 200 70 7 20 lS . 7 124 

so ISO N N N 200 N 30 N 1SO 3 10 20· . s 12S 

30 20 N N 700 200 N 20 200 so 7 lS 10 . 3 126 

lS 20 N L 100 100 N 70 N 1,000 . 2 10 . s . s- 127 

1S L 100 N lSO 200 N 20 L so 3 1S 10 . 7 128 

so 10 N N 200 300 N 20 N 30 s 1S 10 . 7 129 

70 10 N N 1SO 100 N 10 N 100 3 7 10 . 3 130 

100 lS N N 700 70 N L N so 3 7 10 . 3 131 

10 20 N N 200 20 N 30 L 300 l.S 10 7 .lS 132 

70 20 N N N soo N 20 200 100 3 1S 7 1 133 

so L N N 200 200 N 20 N so 3 10 7 . 7 134 

30 L N N 1SO 200 N 20. N so 3 10 7 . s 13S 

so L N N 100 200 N 20 N 70 3 10 s . 7 136 

30 L N N 200 ISO N 10 N 30 s 10 20 . 3 137 

lS so N 20 1SO 100 N 30 N 300 . s s . 7 .lS 138 

1S 10 N N N 100 N lS N 70 l.S s 2 .lS 139 

s lS N N N 70 N 20 N 150 1 s . s . s 140 

100 10 N N N soo N 20 .N 70 7 lS 7 >1 141 

70 N N N N 300 N 20 N 70 3 7 l.S . 7 142 

70 N N N N 300 N lS N so 3 7 . 7 . 7 143 

100 L N N N 300 N 20 N 70 3 7 2.0 . 7 144 

70 N N N so 300 N 20 N ISO 3 10 l.S . 7 14S 

so N N N N 300 N lS N so 2 7 l.S . 7 146 

determination 

2 10 100 10 so 10 so 10 200 20 0.02 o.os .o.os 0.001 

13 
2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

21 

22 

23 

24 

25 

26 

27 

28 

29 

30 

Description of samples given in table 1 

[Unless otherwise noted, all samples are grab samples. Sample locations are shown in fig. 2] 

Prospect or 

mine 

Porphyry Mountain molybdenum -gold prospect 

-----do-----------------

-----do-----------------

-----do-----------------

-----do-----------------

-----do-----------------

-----do-----------------

Nikolai mine------------

Copper prospect west of 

Boulder Creek. 

-----do-----------------

-----do-----------------

-----do-----------------

Antimony-gold prospect 

north of Crumb Gulch. 

-----do-----------------

-----do-----------------

-----do-----------------

Antimony-gold prospect 

south of Crumb Gulch. 

-----do-----------------

-----do-----------------

Prospect north of 

Chitistone River. 

Peavine prospect--------

Prospect southwest of 

Nelson prospect. 

Nelson prospect, No. 4 

adit. 

Description 

12-in. channel sample 

across molybdenitequartz vein. 

18-i n. chann e 1 sample 

across molybdenitequartz vein. 

Molybdenite -q u a r t z vein. 

12-in. channel sample 

across molybdenitequartz vein. 

9-in. channel sample across 

molybdenite-quartz vein. 

10-in. channel sample 

across molybdenitequartz vein. 

Molybdenite-quartz vein. 

12-in. channel sample 

across altered zone. 

9-in. channel sample across 

mineralized shear zone. 

Chip sample, 12-in. long, 

spaced at 2-in. intervals 

across mineralized shear 

zone. 

12-in. channel sample 

across quartz-calcite 

vein. 

Bornite-rich pod in she a r 

zone. 

12-in. channel sample 

across vein and gouge. 

3-in. channel sample across 

vein. 

12-i n. c han n e l s a m p 1 e 

across shear zone. 

-----do-----------------

12-in. channel sample 

across vein. 

16-in. channel sample 

across vein. 

Vein. 

Felsic dike. 

Altered zone, 30 ft thick, 

cutting Chitistone Limestone. 

Altered Nikolai Greenstone. 

Altered zone cutting Nizina 

Limestone. 

Altered zone, 8ft thick, cutting Nizina Limestone. 

Vein 4 in. wide. 

Composite grab sample 

from calcite-rich altered 

zone, 3 ft thick, in Chitistone Limestone. 

Altered zone, 2 ft thick, at 

Nikolai GreenstoneChitistone Lime stone 

contact. 

Altered and leached Nikolai 

Greenstone. 

Chip sample, 12-in. long, 

spaced at l-in. intervals 

across vein. 

-----do----------------- Chip sample, 24 in. long, 

spaced at l-in. intervals 

across vein. 

32 

33 

34 

35 

36 

37 

38 

~9 

40 

41 

42 

43 

44 

45 

46 

47 

48 

49 

50 

51 

52 

53 

54 

55 

56 

57 

Prospect or 

mine 

Westover mine No. 1 

adit. 

-----do-----------------

North of portal of Westover No. 1 adit. 

Radovan low-contact 

prospect. 

-----do-----------------

-----do-----------------

-----do-----------------

Radovan greenstone prospect lower adit. 

-----do-----------------

Radovan greenstone prospect upper adit. 

-----do-----------------

-----do-----------------

-----do-----------------

Prospect south of Nikolai 

Butte. 

-----do-----------------

-----do-----------------

Prospect east of Nikolai 

Butte. 

Prospect in thick altered 

zone north of Hancock 

Pass. 

Description 

24-in. channel sample 

across lode. 

18-in. channel sample 

across lode. 

Chip sample, 15ft long, 

spaced at 1-ft invervals 

across copper-stained altered zone. 

Altered zone, 2 ft thick, 

cutting Chitistone Limestone. 

Altered zone, 10 ft thick, 

cutting lower member of 

McCarthy Formation. 

Altered zone, 12 in. thick, 

in basal Chitistone Limestone. 

Float from main shear zone.· 

Main shear zone 10ft wide. 

High-grade float. 

Chip sample, 8ft long, 

spaced at 6-in. intervals 

across altered zone cutting Nikolai Greenstone. 

Altered zone, 15ft thick, 

cutting Nikolai Greenstone. 

12-in. channel sample 

across mineralized fault 

zone cutting Nikolai 

Greenstone. 

15-in. channel sample 

across mineralized fault 

zone cutting Nikolai' 

Greenstone. 

14-i n. chan ne 1 samp 1 e 

across vein. 

8-in. channel sample across 

vein. 

6-in. channel sample across 

vein. 

12-in. channel sample 

across vein. 

Altered zone, 10ft wide, 

cutting Nizina Limestone. 

Chip sample, 10ft long,J 

spaced at 6-in. intervals 

across mineralized zone. 

Thin altered zone along 

contact between Nikolai 

Greenstone and Chitistone Limestone. 

Altered zone a few inches 

thick in basal Chitistone 

Limestone. 

Scattered copper minerals 

in sheared Nikolai Greenstone. 

Altered fault zone 50ft thick. 

Altered zone, 10ft thick, 

cutting Nizina Limestone. 

Prospect south of Hancock Chip sample, 12ft long, 

Pass.i spaced at 4-in. intervals 

across altered zone. 

31 -----do----------------- Vein 2 in. thick vein. 

14 
58 

59 

60 

61 

62 

63 

64 

65 

66 

67 

68 

69 

70 

71 

72 

73 

74 

75 

76 

77 

78 

79 

80 

81 

82 

83 

84 

85 

86 

87 

88 

89 

Prospect or 

mine 

Prospect south of Hancock 

Pass. 

Taylor prospect ---------

-----do-----------------

-----do-----------------

-----do~~---------------

-----do-----------------

-----do-----------------

-----do-----------------

-----do-----------------

-----do-----------------

Description of samples given in table !-Continued 

Description 

Composite g r a b s a m p 1 e 

from an altered zone, 8 

ft wide. 

Breccia float. 

Fault zone, 10 ft wide, cutting Nizina Limestone. 

Altered fa u 1 t zone, 20 ft 

thick, cuttingNizina 

Limestone. 

Altered zone, 6ft thick, 

cutting Nizina Limestone. 

Quartz vein, 6 in. thick, 

cutting Nizina Limestone. 

-----do-----------------

Sti bn it e-q u art z-calcite 

vein, 6 in. thick, cutting 

Nizina Limestone. 

S t ibn it e-bearing q u art z 

vein and silicified zone, 3 

ft thick, cutting Nizina 

Limestone. 

Altered zone, 6 ft thick, 

cutting Nizina Limestone. 

Altered zone, 8ft thick, 

cutting Nizina Limestone. 

Altered fault zone, 15ft 

thick, separating Chitistone L i m e s ton e and 

. Nikolai Greenstone. 

Felsic dike cut by quartz 

·veinlets. 

Chip sample, 20ft long, 

spaced at 9-in, intervals 

across altered zone. 

Composite grab sample selected from altered zone 

20ft_wide. 

Felsic dike. 

Chip sample, 30ft long, 

spaced at 9-in. intervals 

along exposed 1 en g t h of 

altered zone. 

Quartz-rich pod in altered 

zone. 

Chip sample, 10ft long, 

spaced at 6-in. intervals 

across weakly a 1 t ere d 

hornfels. 

Pyritized intrusive rock. 

Altered zone, 6-in. wide, 

in hornfels. 

Gossan. 

Hornfels, float. 

Tertiary intrusive rock, 

fioat. 

Hornfels, float. 

Altered h or n f e 1 s c u t by 

quartz veinlets, float. 

Hornfels, float. 

Tertiary intrusive rock, 

float. 

Altered zone, 6 ft thick, in 

Nikolai Greenstone. 

Altered dike. 

Chip sa m p 1 e a c r o s s altered zone, 10ft wide, 

spaced at 6-in. intervals; 

altered zone cuts Nikolai 

Greenstone. 

Altered fault zone, 10ft 

thick, cutting Nikolai 

Greenstone. 

15 

90 

91 

92 

93 

94 

95 

96 

97 

98 

99 

100 

101 

102 

103 

104 

105 

106 

107 

108 

109 

110 

Ill 

112 

113 

114 

Prospect or 

mine 

Description 

Composite g r a b sa m p 1 e 

from altered zone about 

250 ft wide that cuts 

Nikolai Greenstone. 

Copper minerals in sheared 

Nikolai Greenstone adjacent to a 1 t e r e d z on e of 

sample 90. 

Sheared Nikolai Greenstone 

in altered fault zone. 

Altered fault zone, 4ft 

wide, separating Nikolai 

Greenstone and volcanic 

rocks of the Station Creek 

Formation. 

Thin mineralized shear 

zone in Nikolai Greenstone. 

Altered zone, 20ft wide, 

cutting Station Creek volcanic rocks. 

Copper minerals in fa u 1 t 

zone, 6 ft thick, cutting 

_ Nikolai Greenstone. 

Altered zone, 10ft wide, 

cutting N i k o 1 a i Greenstone. 

-----do-----------------

Altered zone, 2 ft thick, 

cutting N i k o 1 a i Greenstone. 

Altered zone, 50ft thick, 

cutting N i k o I a i Greenstone. 

Thin altered zone near base 

of Nikolai Creenstone. 

Black shale of Hasen Creek 

Formation. 

Altered Station Creek volcaniclastic rock, 

Altered zone, 5 ft wide, 

in Nikolai Greenstone. 

Chip sample spaced at 6-

in. intervals across altered zone 20ft widecutting Nikolai Greenstone. 

Altered zone, 6 ft thick, 

cutting N i k o 1 a i Greenstone. 

Cpmposite grab sample 

from altered fault zone, 

20ft wide, separating 

Nikolai Greenstone and 

rocks of the Hasen Creek 

Formation. 

Composite grab sample 

representative of copperbearing zone 1-2 ft wide 

within an altered zone 15 

ft wide. 

Conglomerate from bas a 1 

Nikolai Greenstone. 

-----do-------------~---

Mineralized fault zone, 1-4 

ft thick, cutting N i k o 1 a i 

Greenstone, 

Altered Nikolai Greenstone. 

-----do-----------------

Altered zone, 10ft wide, 

in Nikolai Greenstone. 
Prospect or 

115 

116 

117 

118 

119 

120 

121 

122 

123 

124 

125 

126 

127 

128 

Description of samples given in table !-Continued 

Description 

Shear zone, 1 ft wide, near 

contact between N i k o 1 a i 

G r e en stone and Hasen 

Creek Formation. 

Altered zone, 10-20 ft 

thick, in Nikolai Greenstone. 

Composite grab sample 

from altered zone; 50 

ft thick, near base of 

Nikolai Greenstone. 

Thin calcite-quartz veinlets 

in altered zone in b a sa 1 

conglomerate of Nikolai 

Greenstone. 

Basal con g 1om e r a t e of 

Nikolai Greenstone. 

Thin altered zone along contact of felsic sill cutting 

Hasen Creek Formation. 

Composite grab sample 

of altered zone, 20ft 

thick, nearcontactbetween Middle Triassic 

rocks and Nikolai Greenstone. 

Altered zone, 10 ft wide, 

cutting gabbro sill. 

Altered zone, 3ft wide, cutting gabbro. 

Composite grab sample 

from altered zone, 20 ft 

thick, cutting basal 

conglomerate of Nikolai 

Greenstone. 

Thin altered zone cutting 

gabbro. 

Altered zone, 10ft wide, 

cutting Tertiary 1 a vas. 

Altered Station Creek volcaniclastic rock. 

Altered contact zone, 3-10 

ft wide, between gabbro 

and Hasen Creek r o c k s. 

16 

129 

130 

131 

132 

133 

134 

135 

136 

137 

138 

139 

140 

141 

142 

143 

144 

145 

146 

Prospect or 

mine 

Erickson mine-----------

-----do-----------------

-----do-----------------

-----do-----------------

-----do-----------------

-----do-----------------

Description 

Composite grab samp-le 

from altered contact 

zone, 3-10 ft wide, between gabbro ·and Hasen 

Creek rocks. 

Altered felsic dike. 

-----do-----------------

Chip sample, 6ft long, 

spaced at 6-in. intervals, 

of altered Station Creek 

volcanic rock. 

Basal con g 1om e r at e of 

Nikolai Greenstone. 

-----do-----------------

-----do-----------------

-----do-----------------

Altered zone, 3 in. thick, 

cutting basal conglomerate of Nikolai Greenstone. 

Volcaniclastic rock f r om 

Station Creek Formation. 

Altered zone, 6 in. wide, 

cutting S t at ion C r e e k 

rocks. 

Composite grab sample 

from altered zone, 50-

200ft wide, that cuts Station Creek volcaniclastic 

rocks. 

Nikolai Greenstone that contains mineralized amygdules. 

R ubbly basal part of a 

Nikolai Greenstone f 1 ow 

that contains native copper and tenorite. 

Copper-rich lode from 

stope. 

Copper minerals in bas a 1 

part of a Nikolai Greenstone flow. 

Native copper-bearing 

Nikolai Greenstone. 

-----do-----------------

Table 2.--Analyses of stream-sediment samEles from 

[Analyses by semiquantitative spectrographic methods, except Au which was analyzed by atomic 

0.1, and so forth. N, not detected; L, detected but below limit of determination; >, greater 

Forn. Atomic absorption analyses by A. L. Meier, R. A. Miller, and T. A. Roemer. Looked for, 

5 ppm in sample 85, 0.7 ppm in samples 73, 79, and 105; As, 700 ppm in sample 72, 300 ppm in 

sample 124; Zn, 300 ppm in sample 105, 200 ppm in samples 73, 85, 99, 100, and 137. Where are shown in parentheses] 

· Parts per million 

Sample Lab. No. Field No. Au B Ba Be Co Cr Cu La Mn 

ACF1 243 67ASj56 L 50 700 L 15 100 50 L 500 

2 242 55 L 50 700 L 5 70 50 N 300 

3 229 42 L 70 1,500 L 10 70 50 L 500 

4 228 41 L 70 700 L 15 70 50 N 300 

5 241 54 L 50 700 L 15 70 50 L 700 

6 240 53 L 30 300 L 10 70 50 N 700 

7 232 45 L 50 2,000 L 15 70 300 N 700 

8 231 44 L 70 3,000 L 15 70 300 N 700 

9 230 43 L 50 700 L 15 70 50 N 500 

10 236 49 L 50 700 L 15 70 30 N 700 

11 235 48 L 50 700 L 20 100 70 N 500 

12 234 47 L 50 700 ·L 20 100 70 N 500 

13 233 46 L 30 700 L 10 50 30 N 700 

14 238 51 L 50 700 L 15 100 50 N 700 

15 237 50 L 30 700 L 20 150 70 L 700 

16 239 52 L 20 700 L 10 100 50 N 700 

17 287 101 L 20 300 N 15 200 70 50 700 

18 285 99 L 30 200 N 20 300 200 N 1,500 

19 286 100 L 50 700 N 15 200 100 N 700 

20 288 102 L 50 500 N 20 200 150 N 700 

21 289 103 L 50 500 N 20 300 100 N 700 

22 290 104 L 100 300 L 15 200 150 N 1,000 

23 208 8 L 50 1,000 N 15 150 70 N 500 

24 207 7 L 50 700 N 20 150 70 N 500 

25 206 6 L 50 2,000 N 20 150 70 L 500 

26 205 5 L 30 500 N 15 150 100 N 500 

27 204 4 L so· 1,000 L 20 100 70 N 700 

28 203 3 L 50 700 L 20 100 70 L 700 

29 201 1 L 30 1,000 N 20 150 70 L 700 

30 202 2 N 70 500 L 20 100 70 L 500 

31 244 57 L 100 3,000 L 15 150 30 70 1,000 

32 245 58 0.06 100 1,-500 L 15 200 30 70 700 

33 246 59 .02 100 1,500 1 15 150 30 50 1,000 

34 248 61 .02 150 1,500 L 20 200 30 70 1,000 

35 249 62 L 100 1,000 L 15 200 30 50 7,000 

36 219 32 L 70 1,000 1 20 100 70 L 700 

37 220 33 .06 50 1,000 L 30 150 70 30 700 

38 218 31 L 50 1,000 L 30 100 70 N 700 

39 216 29 L 70 1,000 L 20 100 100 L 700 

40 217 30 N 20 700 N 15 70 50 N 300 

41 215 28 .04 50 1,000 L 20 150 100 20 700 

42 214 27 L 50 1,000 L 20 150 70 L 700 

43 211 24 L 50 1,000 1 20 150 70 L 700 

44 212 _25 .02 50 1,000 L 30 150 70 L 700 

45 213 26 L 70 1,000 1 30 150 100 20 700 

46 210 23 L 50 1,000 L 30 100 100 20 700 

47 209 22 L (.1) 20 500 1 5 30 30 N 300 

48 227 40 L 70 3,000 L 30 150 70 L 700 

49 226 39 L (.1) 50 700 L 15 70 50 N 500 

so 225 38 L 50 700 L 20 150 50 L 700 

18 
the McCarthr B-4 and B-S guadrangles, Alaska 

absorption. Analyses reported to the nearest number in the series 1, 0.7, O.S, 0.3, 0.2, O.lS, 

than. Semiquantitative spectrographic analyses by K. J. Curry, Arnold Farley, Jr., and C. L. 

but not detected: Ag, As, Bi, Cd, Hg, Mo, Pd, Pt, Sb, Sn, Ta, Te, W, and Zn; exceptions: Ag, 

sample lOS; Mo, 10 ppm in sample 64, S ppm in samples 60, 136, 141, and 142; W, 100 ppm in 

the limits of determination differ from those indicated at the end of the table, their values 

Parts per million--Continued Percent 

Nb Ni Pb Sr v y Zr Mg Fe Ca Ti Sample 

L 30 lS 300 100 20 lSO l.S 3 2 0.3 1 

L 30 10 1,000 70 lS 70 . s l.S s • 2 2 

L 30 lS 200 100 lS 100 • 7 3 1.5 • 3 3 

L 30 lS 150 100 lS 100 . s 3 . s .3 4 

L 30 lS 700 100 20 lSO l.S s 3 . s s 

L 30 10 300 100 lS 100 1 3 3 . s 6 

L 30 10 300 100 lS 100 1 s 1.5 . s 7 

L 30 lS 200 100 lS 1SO • 7 s 1 . s 8 

L 30 lS 300 70 lS 100 .3 3 . s • 3 9 

10 30 lS soo 70 20 100 l.S 3 3 . s 10 

L 30 lS soo lSO 20 lSO l.S 5 l.S . 5 11 

L 30 lS 300 100 15 100 1.5 s l.S • 5 12 

L 30 10 300 70 10 100 • 7 3 .7 .3 13 

L 30 1S 700 70 20 100 l.S 7 3 .3 14 

L 30 1S soo 100 1S 150 l.S s 3 . s 1S 

N 30 10 700 100 lS 100 1 s 3 • 3 16 

10 70 10 300 300 lS 70 3 10 20 . s 17 

10 70 lS 300 soo 20 70 3 10 7 1.0 18 

10 70 10 soo soo 20 70 3 10 10 1.0 19 

10 70 lS 200 soo lS 100 3 10 7 1.0 20 

10 70 10 soo soo 30 100 3 10 10 1.0 21 

10 70 30 300 soo lS 100 3 10 10 1.0 22 

L so 20 300 100 lS lSO l.S 5 1 • 3 23 

10 so 20 300 lSO 20 lSO l.S 7 2 • 7 24 

L 70 30 300 100 1S ISO l.S s • 7 .3 2S 

L 30 1S 300 ISO lS 100 l.S 3 2 . s 26 

L so 20 300 1SO 20 1SO l.S s 1.5 . s 27 

L so 1S 200 1SO lS 100 l.S 3 l.S . s 28 

L so 30 200 100 20 lSO l.S 3 • 7 • 3 29 

L 30 20 100 100 lS 100 1 2 l.S • 3 30 

L (20) so 10 300 1SO lS lSO 1 7 l.S .3 31 

L (20) so L 300 100 1S 200 1 7 • 7 • 7 32 

L (20) so 1S 200 1SO 1S lSO 1 7 l.S • 7 33 

L (20) 70 1S lSO 1SO lS 200 l.S 7 • 7 • 5 34 

20 so 10 100 lSO lS lSO l.S lS • 7 . s 3S 

L 70 30 200 150 30 lSO 1. s. 7 . s • 5 36 

L 70 30 300 1SO 30 lSO l.S 7 • 7 . s 37 

L 70 30 300 1SO 20 lSO l.S 7 • 7 . s 38 

L 70 30 300 1SO 20 lSO l.S 7 . s . s 39 

L so 10 200 70 10 70 1 3 .1 • 2 40 

L so 30 300 100 30 1SO l.S 7 1 . s 41 

L so 20 300 100 lS 1SO l.S 7 • 7 .3 42 

L 30 20 200 100 lS 1SO 1.5 s • 5 .3 43 

L 70 30 200 1SO lS lSO l.S 7 . s .3 44 

L 70 30 200 1SO 20 1SO l.S 7 • 7 . s 4S 

L 70 70 200 100 30 1SO 1 7 • 5 • 5 46 

L 20 30 so 70 15 70 . s 1 • 7 • 2 47 

L so 20 soo 150 20 1SO l.S 7 ·1 • 5 48 

L 30 20 100 70 1S 70 • 7 2 • 7 • 2 49 

L so 20 200 100 20 1SO l.S s • 7 .3 so 

19 
Table 2.--Anallses of stream-sediment samEles from the 

Parts per million 

Sample Lab. No. Field No. Au B Ba Be Co Cr Cu La Mn 

ACF51 222 67ASj35 L so 700 L 20 70 70 L 700 

52 223 36 L (. 1) so 1,000 1 20 70 70 L 700 

53 224 37 N 70 1,000 1 15 100 70 N 700 

54 221 34 L so 1,000 L 30 150 70 L 700 

55 340 142 L 70 1,000 L 15 150 100' N 700 

56 341 143 L so 2,000 L 20 150 70 L 700 

57 342 144 L 70 1,500 L so 150 100 20 700 

58 343 145 L 70 1,000 L 15 150 30 L 700 

59 251 64 L 30 200 N 10 150 20 L 300 

60 250 63 L 100 100 N 10 100 30 L 500 

61 252 65 L so 100 N 20 300 30 L 500 

62 256 67 0.03 70 1,000 L so 200 30 30 700 

63 253 66 • 2 20 300 N 15 200 30 20 500 

64 376 67AWk65 L 70 700 L 15 150 30 20 700 

65 377 66 L 100 700 1 20 150 70 20 1,000 

66 255 67ASj68 .06 so 300 N so 300 100 L 1,500 

67 256 69 .03 so 500 L so 300 70 L 1,500 

68 257 70 L 20 200 N 70 300 150 L 1,500 

69 259 72 L 70 700 N 70 300 70 L 700 

70 258 71 .06 30 300 N 70 300 100 L 1,500 

71 260 73 L 30 500 N 10 70 15 L 200 

72 261 74 .04 so 700 N 70 150 70 L 1,000 

73 378 67AWk67 L 150 1,500 N so 300 200 20 1,500 

74 263 67ASj77 L 20 200 N 20 300 70 N 1,000 

75 284 94 L 30 70 N 150 500 300 N 2,000 

76 280 88 L so 100 N so 200 300 N 1,500 

77 279 87 L 100 30 N so 150 150 N 1,000 

78 278 86 .03 100 300 N 70 300 300 N 1,500 

79 282 92 L 150 >5,000 L 15 150 300 N 1,500 

80 283 93 L 70 150 N 70 300 300 N 2,000 

81 281 90 .02 20 700 N so 70 300 N 2,000 

82 379 67AWk68 L 20 so L 15 200 100 L 1,000 

83 380 69 L 70 1,000 N 20 150 300 N 1,500 

84 375 58 L so 70 L 30 300 300 L 1,500 

85 339 46 .03 100 1,500 N 30 300 300 N 1,500 

86 381 70 9.6 so 500 .L 30 150 200 L 1,500 

87 382 71 L 70 700 L 30 300 150 20 1,000 

88 383 72 L 30 500 N so 300 300 N 1,500 

89 338 45 L 70 100 N so 300 300 N 1,000 

90 374 54 L 200 so ;N so 300 300 20 1,500 

91 373 53 L 200 70 N 70 300 150 20 1,500 

92 291 67ASj lOS L 30 so L 15 150 150 N 700 

93 292 106 L L 10 N N 30 15 N 100 

94 294 108 L 10 20 N N so 20 N 100 

95 295 109 L L 10 N N 20 15 N 70 

96 293 107 L L 10 N N 30 30 N 100 

97 297 111 L 20 200 N 15 200 100 N 700 

98 296 110 L 70 700 L 20 150 100 N 1,000 

99 352 154 L (.1) 150 1,000 1.5 20 150 150 20 1,500 

100 355 155 L 70 1,000 1 30 150 100 20 1 ,,500 

101 308 116 L 100 L N 30 300 30 N 500 

i02 309 117 L 100 700 N 30 100 so 30 500 

103 299 113 L so 1,000 L 15 150 100 N 700 

104 298 112 L so 1,000 L 20 100 100 N 700 

105 384 67AWk73 .06 150 1,500 1 70 150 200 30 5,000 

20 
McCarthr B-4 and B-5 guadrangles 2 Alaska--Continued 

Parts per million--Continued Percent 

Nb Ni Pb Sr v y Zr Mg Fe Ca Ti Sample 

L so 30 200 150 20 100 1.5 7 o.s 0.3 51 

L 70 30 200 150 20 150 1.5 7 • 5 • 5 52 

L 30 30 100 100 15 100 1.5 3 • 7 • 3 53 

L 70 30 300 150 20 150 1.5 7 • 7 • 5 54 

15 70 15 150 200 15 150 1 7 1 • 5 55 

15 70 20 150 200 20 150 1.5 7 1.5 • 5 56 

20 70 20 200 300 30 150 1.5 7 1.5 • 7 57 

15 so 15 150 200 20 150 1 7 1.5 • 5 58 

N (20) 30 N 500 70 10 70 10 3 >20 .15 59 

N (20) 30 N 700 70 10 so 5 5 >20 .15 60 

N (20) 70 N 700 150 7 70 2 7 >20 • 2 61 

L (20) 100 N 700 150 15 150 1 10 10 • 7 62 

N (20) 30 N 700 100 7 70 1.5 5 >20 • 2 63 

10 so 10 1,000 200 so 150 1.5 7 3 • 7 64 

15 70 10 500 300 20 150 1.5 7 • 5 1.0 65 

L (20) 150 N 500 150 15 100 2 15 20 1.0 66 

L (20) 150 N 700 150 10 100 2 10 10 1.0 67 

L (20) 150 N 100 150 15 100 2 15 7 1.0 68 

20 150 N 700 200 7 200 1.5 15 >1 >1 69 

20 150 N 150 200 10 150 1.5 15 >1 >1 70 

L (20) 30 N 150 100 7 150 • 7 3 • 7 .3 71 

20 70 N 200 200 15 150 1 7 • 3 >1 72 

L 100 15 300 300 30 70 3 10 10 1 73 

N (20) 100 N 150 100 20 100 3 15 5 • 7 74 

10 150 L 100 700 30 100 3 10 7 >1 75 

10 100 L 300 500 30 150 3 10 7 1 76 

10 70 L 100 500 20 70 3 10 5 1 77 

15 150 L 200 700 30 150 3 15 7 >1 78 

10 100 15 200 700 30 150 3 10 5 1 79 

10 150 10 200 700 30 150 3 10 7 >1 80 

15 so 15 200 1,000 so 150 3 15 7 >1 81 

L so L 300 200 20 so 7 5 20 .7 82 

15 so 15 200 500 20 200 2 15 3 >1 83 

io 100 10 200 500 30 100 3 10 10 1 84 

15 70 30 300 700 30 100 2 15 3 >1 85 

10 70 15 300 300 30 150 3 10 7 1 86 

15 100 15 200 300 30 200 3 10 5 1 87 

10 70 15 300 500 20 150 3 15 7 >1 88 

15 100 L 200 500 20 100 3 10 7 1 89 

L 100 10 150 500 30 150 3 15 10 >1 90 

10 100 10 200 500 30 100 3 15 7 >1 91 

10 30 L 700 150 10 30 7 "7 15 • 5 92 

N 7 L 700 70 10 L 5 .7 20 .07 93 

N 5 L 1,500 70 10 20 2 . 5 20 .OS 94 

N 5 L 700 30 10 L 3 • 3 20 .03 95 

N 5 L 700 30 10 20 3 .3 20 .03 96 

10 so 10 300 500 15 70 3 10 15 1 97 

10 70 30 200 300 20 150 1.5 15 1.5 .7 98 

15 70 so 200 200 30 150 1.5 10 1.5 • 7 99 

10 70 30 150 200 20 100 1.5 7 7 • 5 100 

N (20) 30 N 300 100 5 150 10 5 20 • 5 101 

N (20) 30 10 300 150 10 150 1 5 3 • 5 102 

10 so 30 150 300 20 150 2 10 5 • 7 103 

10 70 so 100 300 30 100 1.5 10 2 • 7 104 

15 100 70 300 200 30 150 2 15 • 7 1.0 105 

21 
Table 2.--Analrses of stream-sediment samEles from the 

Parts per million 

Sample Lab. No. Field No. Au B Ba Be Co Cr Cu La Mn 

ACF106 306 67AMk36 L 10 30 N lS 300 100 N 700 

107 307 37 L 70 lSO N N 300 70 N 700 

108 305 35 L 10 30 N 15 300 70 N 700 

109 304 34 L L 30 N 10 150 50 N 700 

110 302 32 0.02 10 30 N 15 200 70 N 700 

111 303 33 L 10 so N 15 200 70 N 700 

112 300 67ASj114 L 50 200 L 15 100 100 N 700 

113 301 115 L 70 1,SOO L 15 150 100 20 700 

114 313 121 L 100 700 N 30 100 so 20 700 

115 311 119 .02 70 500 3 30 150 30 L 500 

116 312 120 L 100 1,000 N 20 100 30 20 soo 

117 310 118 L 70 700 N 30 150 so 20 soo 

118 318 126 L 30 1,000 L 50 150 50 50 1,000 

119 317 125 L 50 1,000 N 70 150 70 30 700 

120 316 124 L 100 1,500 1 20 150 30 20 500 

121 315 123 L 100 1,500 N 50 150 30 30 500 

122 319 127 L 50 1,000 N 30 150 50 30 1,000 

123 320 128 L (.1) 50 1,000 L 30 lSO 100 30 700 

124 351 153 L 70 1,000 1 30 1SO 200 20 1,000 

125 268 67AWkS L 100 N N 70 500 70 N 1,500 

126 267 4 L 100 700 N 30 300 70 20 700 

127 266 3 • 7 L 300 N 50 300 30 N 700 

128 264 1 L 70 200 N 50 500 so N 1,000 

129 265 2 L 70 200 N 50 500 lSO N 1,000 

130 270 8 .OS 15 300 N 50 300 30 30 1,000 

131 269 7 . 7 10 300 N 50 500 30 N 1,000 

132 277 18 L 70 700 1 30 100 50 50 1,000 

133 271 9 L 70 300 N 30 300 so 50 700 

134 274 13 L 70 700 3 30 150 30 50 1,000 

135 276 15 L 70 1,000 3 30 150 30 70 700 

136 27S 14 .03 100 1,000 3 30 1SO 100 70 1,500 

137 272 10 L 70 300 N 30 1SO 50 50 1,000 

138 273 11 .09 50 200 N so 300 30 50 1,000 

139 337 39 L 100 1,000 N so 150 70 30 100 

140 336 38 L 100 1,000 N 30 100 30 30 700 

141 335 37 .08 70 700 N 30 150 70 so 1,000 

142 334 36 L 100 1,000 N 50 150 30 30 1,000 

143 333 3S L 70 1,000 N 70 150 70 50 2,000 

144 332 34 L 70 1,000 N 50 150 70 30 2,000 

145 331 33 L (.1) 70 1,000 N so 1SO 70 30 1,500 

146 330 32 L 70 1,000 N 50 150 50 30 1,000 

147 329 31 L 30 1,000 N 20 1SO 30 20 1,000 

148 328 30 L 70 1,000 N 50 1SO 30 30 1,000 

149 327 29 L 50 1,000 N so 1SO 30 30 1,000 

150 326 28 L so 700 N so 150 30 20 1,000 

151 325 27 L so soo 1 50 150 30 20 1,000 

1S2 321 23 L 50 1,000 L 50 150 so 30 700 

1S3 322 24 l.S 30 soo L 30 150 30 L 700 

1S4 323 25 L 30 soo N so 150 30 L 1,000 

1SS 324 26 L 50 soo N 50 150 100 L 1,000 

1S6 348 67ASj150 L 100 1,000 L 20 1SO 1SO L 700 

1S7 349 151 L 100 1,500 L so 1SO 150 20 1,000 

158 3SO 152 L 100 1,500 L 20 1SO 100 20 1,000 

159 346 148 L 70 700 L 1S 200 70 20 700 

160 34S 147 L 70 2,000 L 1S 150 so 20 700 

22 
McCarthr B-4 and B-S guadrangles, Alaska--Continued 

Parts per million--Continued Percent 

Nb Ni Pb Sr v y Zr Mg Fe Ca Ti Sample 

N so 10 300 300 IS 20 s 10 >20 o.s 106 

N (2 0) 100 N soo lSO s N 10 10 >20 • 3 107 

N so L 300 300 lS 10 s 10 20 .s 108 

N 30 L 300 lSO lS 10 s 3 20 • 2 109 

N so L 300 soo 15 20 7 10 20 1.0 110 

N so L 300 200 15 20 s 10 20 . s 111 

10 so 30 150 200 20 100 2 10 s • 7 112 

10 70 20 lSO 500 20 70 2 10 .lS • 5 113 

N ( 2 0) 30 30 150 lSO 10 lSO 1 5 • 7 . s 114 

N (20) 30 lS 500 lSO 10 lSO l.S 5 2 . s llS 

N (20) 30 30 lSO 100 10 lSO 1 s • 7 • 5 116 

N (2 0) 30 N 300 lSO 7 lSO 1 7 s • 7 117 

N (20) so 30 lSO lSO 30 150 1 7 • 5 • 3 118 

N (2 0) 70 20 200 100 30 150 l.S 7 • 7 • 3 119 

N (2 0) 30 30 100 100 lS 150 1 s • 7 . s 120 

N (20) 30 30 200 lSO 10 lSO 1 7 . s . s 121 

N (20) 30 20 lSO 100 20 lSO 1 7 . 7 . 3 122 

N (20) 30 20 200 100 20 lSO 1 7 1 . s 123 

lS 100 70 lSO 200 30 lSO l.S 10 1 . s 124 

N (2 0) 70 N lSO 150 10 70 3 15 7 1.0 12S 

N (2 0) 70 N 200 100 20 100 2 15 3 1.0 126 

N (2 0) so N 700 200 N 100 3 15 s 1.0 127 

N (20) 70 N 200 lSO lS lSO 3 15 5 • 7 128 

N (20) 70 N ISO lSO N 100 2 lS s 1.0 129 

N (20) 70 N 700 lSO lS lSO 3 10 7 .7 130 

N (20) 70 N soo lSO N lSO 3 lS 7 1.0 131 

N (2 0) 70 N lSO lSO lS 200 • 7 10 . s • 5 132 

N (20) 70 20 lSO 100 20 lSO 1 10 1 • 7 133 

30 70 20 lSO 100 20 200 1 7 3 • s 134 

N (2 0) 70 10 200 lSO 30 200 • 7 10 3 . s 13S 

30 70 N lSO 100 30 200 1 10 2 • 7 136 

N (20) 70 N lSO 100 20 150 1 10 l.S . s 137 

20 70 30 700 100 lS 200 3 10 10 • 7 138 

N (20) 30 30 lSO 100 lS lSO • 7 10 .7 .s 139 

N (20) 30 30 lSO 100 lS lSO • 7 7 • 7 .3 140 

N (20) 30 N 300 70 10 200 • 7 lS LS 1 141 

N (2 O) 30 N 300 70 20 lSO • 7 7 • 7 .s 142 

N (20) so 20 200 100 20 lSO 1.0 7 1 . s 143 

N (20) so 20 lSO 100 20 lSO 1.0 7 • 5 . s 144 

N (20) 70 30 200 100 20 lSO 1.0 7 • 7 • s 14S 

N (20) so 30 200 70 lS lSO • 7 7 . s • 3 146 

N (20) 30 30 300 70 20 lSO 1.0 7 1 . s 147 

N (20) so 20 lSO 100 lS 200 1.0 7 .7 .2 148 

N (20) so 20 200 100 20 lSO • 7 7 • 7 . s 149 

N (20) so 20 lSO 100 lS lSO • 7 7 • 7 • s lSO 

L (20) so 20 200 100 lS lSO 1.0 7 • 7 • s 151 

N (20) so 30 1SO 100 20 1SO 1.0 7 • 7 • 5 1S2 

N (20) so 20 100 100 lS 1SO • 7 s • 7 • 3 1S3 

N (20) 30 30 1SO 100 15 lSO • 7 7 • 7 • 3 1S4 

N (20) so 30 1SO 100 1S 1SO • 7 7 • 7 • 3 1SS 

1S 70 30 1SO 200 1S 100 l.S 10 1 . s 1S6 

1S 70 20 200 300 30 150 l.S 10 l.S .7 1S7 

10 70 30 200 300 30 1SO l.S 7 l.S .7 1S8 

1S 50 20 200 200 20 1SO l.S 7 1 • 7 1S9 

15 70 15 200 200 20 150 1 7 1 • 5 160 

23 
Table 2.--Analrses of stream-sediment samEles from the 

Parts per million 

Sample Lab. No. Field No. Au B Ba Be Co Cr Cu La Mn 

ACF161 347 67ASjl49 L 70 5,000 L 100 300 70 L 1,000 

162 344 146 L 70 2,000 L 20 150 70 L 700 

Limit of 

0.02 10 5 1 5 5 5 20 10 

24 
McCarthr B-4 and B-S guadrangles 2 Alaska--Continued 

Parts per million--Continued Percent 

Nb Ni Pb Sr v y Zr Mg Fe Ca Ti Sample 

lS 100 lS 300 300 30 lSO l.S 10 l.S 0.7 161 

1S so 30 1SO 200 20 1SO 11. s 7 l.S .s 162 

determination I 

10 2 10 so 10 10 20 0.02 o.os o.os 0.001 

GP 0 866 071 

25