UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

MAP AND DISCUSSION OF THE METALLIFEROUS AND SELECTED NONMETALLIFEROUS

MINERAL RESOURCES OF THE TALKEETNA MOUNTAINS QUADRANGLE, ALASKA

By

D. A. Singer, Bela Csejtey, Jr., and R. 0. Miller

TO ACCOMPANY OPEN-FILE REPORT 78-558Q

This report is preliminary and has not been reviewed for con­ formity with Geological Survey standards and nomenclature

Menlo Park, California

1978

Introduction

This report consists of a text, three tables, references cited and

an accompanying map, and it is the culmination of a mineral resource

assessment of the Talkeetna Mountains quadrangle of Alaska. The report

was prepared as part of a multidisciplinary assessment of the quadrangle

by the U.S. Geological Survey's Alaska Mineral Resource Assessment

Program (AMRAP). It represents an integration of the geologic, geochemi-

cal, and geophysical investigations of the program; the other components

are listed in the references at the end of this report.

The general form of this assessment is consistent with that used in

the AMRAP program (Singer, 1975). An attempt is made to estimate the

resources in the ground in such a way that different assumptions about

intensity and quality of exploration, future prices, and mining costs

can be tested to estimate potential supply. Three basic steps are

attempted. First, tracts of land are delineated according to the kinds

of mineral deposits their character will permit. Second, the number of

deposits within each tract is estimated. And third, characteristics of

the ore in deposits are estimated by means of models of average grades

and tonnages based on similar well-explored deposits.

Tracts of land that are geologically permissive for the occurrence

of mineral deposit types are delineated on the accompanying map. These

tracts were outlined on the basis of their known deposits (listed in

Table 3 and shown on the map) and their potential for undiscovered de­

posits as inferred on the basis of occurrences in similar geologic set­

tings elsewhere. Table 3 was previously published by Csejtey and

Miller (1978). The outer Vimit of delineated tracts was not allowed to

extend beyond geologic units that are permissive for the occurrence of

a deposit type, and tracts were further restricted in area! extent if

closer examination demonstrated absence of mineralization. Criteria that

were used to identify and delimit each tract are presented in Table 1.

The undelineated tracts, including areas of thick unconsolidated sediments,

were also investigated for mineral deposits. Although these tracts may

contain deposits of placer gold, zeolites, and barium (see page 7), the

available geological, geochemical, and geophysical data did not permit

delineation.

Probabilistic estimates of the number of deposits of each type were

made for the few tracts where such estimates were warranted by available

information. The estimates were made subjectively, and are presented in

a probabilistic form in order to show the degree of certainty concerning

the number of deposits that might occur. In order to provide estimates

which agree in general with the established format of AMRAP assessments

(Singer, 1975; Singer and Ovenshine, 1979, p. 588), in this report we

have estimated the number of mineral deposits possibly present in each

tract from a cumulative distribution diagram at the arbitrarily chosen 10,

50, and 90 percent confidence levels. Thus, at the 90 percent level there

is a 90 percent chance that the actual number of deposits in the tract is

equal to or exceeds the estimate. A variety of pertinent considerations

were integrated, including degrees of geologic, geochemical, and geophys­

ical favorability; extent and adequacy of exploration and geologic know­

ledge; and extent of exploration of deposits already recognized.

Grade-tonnage models are provided for four deposit types: porphyry

copper, porphyry molybdenum, fel sic to intermediate volcanogenic, and

mafic volcanogenic (Table 2). Models were based on well-explored de­

posits for which tonnages of mineralized rock would be calculated by

adding past production to estimated reserves or resources. Deposits

known to be incompletely explored were excluded in constructing models.

A more extensive discussion of the models can be found in Menzie and

Singer (in press).

The mineral resources in the quadrangle are discussed below by tract

and by deposit type. Grade-tonnage models are mentioned where applicable,

Estimates of the number of deposits are also presented by tract for the

few situations where it was possible to make such estimates. Several

commodities and/or deposit types are not specifically delineated because

of their widespread occurrence or apparent lack of geologic control;

these are described in the section following the discussion of resources

by tract.

Tract TI

This tract is delineated for disseminated tin deposits. Tin values

range from 20 to 15,000 ppm in the nine rock samples of alaskite and mus-

covite granite reported by Reed (1978). Values of 100 and 150 ppm silver

were reported from two of Reed's samples and disseminated cassiterite was

observed in three samples. The distribution of high values of tin in

stream sediment and pan concentrate samples (Miller and others, 1978a)

suggests that tin mineralization is widespread in the tract. Additional

work is required to determine the extent and grade of tin mineralization.

It was not possible to construct a grade-tonnage model for this deposit

type.

Tract T£

No tin-bearing occurrences are known in this tract, however the

presence of geochemical anomalies of tin and related elements (Miller and

others, 1978a) like those in Tract T^, and the presence of the same age and

general types of granite as those in Tract TJI suggest that this tract also

deserves further work.

Tract P}

Two porphyry molybdenum prospects are known in this tract, but neither

has been drilled intensively enough to determine whether their sizes and

grades are comparable to the deposits used to construct the porphyry molytx-

denum grade-tonnage model (Table 2). Although permissive granitic rocks

are widespread, the number of geochemical anomalies is not large. On the

basis of this evidence, the number of porphyry molybdenum deposits com­

parable to the grade-tonnage model is subjectively estimated to be:

(1) a 90 percent chance that there are 1 or more deposits;

(2) a 50 percent chance that there are 2 or more deposits;

(3) a 10 percent chance that there are 2 or more deposits; that is,

the chance that there are more than two deposits is estimated

to be much less than 10 percent.

Tract ?2

A few anomalous values of copper and gold from pan concentrate and

stream sediment samples, a low-grade disseminated molybdenum and gold

occurrence (map no. 19), and an aeromagnetic pattern indicative of either

a zoned or altered pluton that is incompletely exposed, suggest the possi­

bility of either porphyry copper or molybdenum deposits in this tract.

The number of porphyry copper or molybdenum deposits comparable to the

grade*-tonnage models of these deposit types (Table 2) is subjectively

estimated to be:

(1) a 90 percent chance that there are 0 or more deposits;

(2) a 50 percent chance that there are 1 or more deposits;

(3) a 10 percent chance that there are 1 or more deposits; that is,

the chance that there is more than one deposit is estimated to

be much less than 10 percent.

Tract P3

This tract is delineated for porphyry copper and/or porphyry molyb­

denum deposits. There is one known porphyry copper prospect (map no. 88)_

that has had some drilling by industry. Scattered geochemical anomalies

and a float sample of altered granodiorite containing molybdenum are

suggestive of other mineralization in the tract. The number of porphyry

copper or molybdenum deposits comparable to the grade-tonnage models of

these deposit types (Table 2) is subjectively estimated to be:

(1) a 90 percent chance that there are 1 or more deposits;

(2) a 50 percent chance that there are 1 or more deposits;

(3) a 10 percent chance that there are 2 or more deposits.

Tract ?4

The presence of porphyry copper and/or molybdenum type deposits

in this tract is suggested by numerous float samples of altered granitic

rocks containing copper and/or molybdenum, several prospects in altered

granitic rocks, and numerous anomalous samples containing copper,

molybdenum, and lead. The number of porphyry copper and/or porphyry

molybdenum deposits comparable to the grade-tonnage models (Table 2) is

subjectively estimated to be:

(1) a 90 percent chance that there are 1 or more deposits;

(2) a 50 percent chance that there are 2 or more deposits;

(3) a 10 percent chance that there are 3 or more deposits.

Tract Y! (P)

Widespread pan concentrate samples having high concentrations of

lead, arsenic, gold, tungsten, molybdenum, copper, tin, and bismuth

suggest that Tract Vj (P) contains base and precious metal vein deposits.

Such deposits would be localized in granitic rocks and the associated

older sediments. Although a grade-tonnage model is not available, de­

posits of this type typically have low tonnage. Porphyry molybdenum

deposits are also indicated as possible because of the extension of the

favorable rocks of Tract PI into Tract V} (P) and the numerous geochemi-

cal anomalies, some of which may be related to porphyry molybdenum

mineralization.

Tract V2

The Tertiary fel sic volcanic rocks in this tract are associated with

numerous pan concentrate samples with high values of copper, lead, arse­

nic, silver, zinc, and molybdenum; locally there are high values of tung­

sten, bismuth, and tin. The only known occurrences are claims for copper

and gold, apparently veins, and altered andesite dikes containing low

values of tin and zinc. Based on this evidence, the tract is delineated

for base and precious metal vein deposits that typically have low tonnage

but locally may have high grades.

Tract Msvj

This tract is delineated for mafic to intermediate volcanogenic

massive sulfide deposits and for copper in amygdaloidal basalts.

Numerous copper and related sulfide-bearing prospects and occurrences of

veins and local disseminations in altered intermediate to mafic meta-

volcanics of upper Paleozoic age are known. There are also some indi­

cations of copper in the upper Triassic amygdaloidal metabasalts, but

little is known about the extent of these occurrences. A large pro­

portion of the geochemical samples from this extensive tract contain

anomalous amounts of the metals that are commonly associated with

veins and volcanogenic massive sulfide deposits. Although this tract

contains numerous base and precious metal veins, tonnages of the vol­

canogenic massive sulfide deposits that are believed to exist in the

tract dwarf those of the veins. A grade-tonnage model for intermediate

to mafic volcanogenic deposits does not exist, however, grade-tonnage

models for felsic to intermediate volcanogenic and for mafic volcano­

genic deposits are provided in Table 2 in order to demonstrate the grades

and tonnages that may exist in this tract. Tonnages are similar for the

two models; the main difference is the presence of lead in some of the

felsic to intermediate deposits. Lead is known to occur in some of the

prospects and occurrences in this tract.

Undelineated Tracts

Some of the commodities or deposit types that are not specifically

delineated are discussed below.

In the Horn Mountains and Albert Creek region, extensive deposits

of mordenite and other zeolites of possible economic interest are known

(see Table 3, map number 112). The known deposits are in the tuffaceous

part of the Lower Jurassic Talkeetna Formation. Similar deposits prob­

ably occur elsewhere in the Talkeetna Formation.

Claims for placer gold are widely distributed in the quadrangle.

For the placer gold deposits of the Nelchina area, Grantz (1956) suggests

that continental gravels of Eocene age, inferred to have overlain most

of the area, contained concentrations of placer gold which were reworked

during late Pleistocene .and Recent time to form the present placers.

The source of the other placer gold in the quadrangle is not known. About

150 oz. of gold was produced from Albert Creek (map number 111), the only

placer deposit in the quadrangle with proven production. Because of the

scanty production, it is believed that there is little chance of signifi­

cant future production of gold from the quadrangle's placer deposits.

Throughout the quadrangle, a large number of the heavy mineral con­

centrate samples showed apparently anomalous concentrations of barium

(Miller and others, 1978k), however, the source of this barium is not

known.

In spite of two creeks having the name Coal Creek in the quadrangle,

no significent deposits of coal are known or suspected.

Table 1. Deposit type and criteria for selection of mineral resource

tracts in the Talkeetna Mountains quadrangle, Alaska.

[Numbers in parentheses are the map numbers of mineral deposits, prospects and occurrences listed on the accompanying resource map and in Table 3.Sources of information for the various criteria are: Csejtey and others (1978), geology; Miller and others (1978a-l), Miller and others (JL978), geochemistry; Csejtey and Griscom (1978), aeromagnetics; Csejtey and Miller (1978), mineral deposits.]

Tract Types of deposit(s) possible and criteria usedoutlined to delineate tractson map _________________________________________

TI Disseminated tin deposits(a) Known disseminated tin prospect containing cassiterite (4).(b) Pervasive alteration (addition of boron and flourine).(c) Small outcrop of greisenized muscovite granite containing

tourmaline, topaz, sericite, and minor flourite.(d) High concentrations of tin and locally silver, arsenic,

copper and zinc in rock samples.(e) Anomalous concentrations of tin, gold, and zinc in stream

sediment samples.(f) High concentrations of tin, silver, tungsten, barium,

arsenic and gold in pan concentrate samples.

T« Disseminated tin deposits(a) Same age and general type of granite as in Ti.(b) Consistently high tin and tungsten and locally high gold

and silver values in pan concentrate samples.(c) One anomalous tin value in a stream sediment sample.

P! Porphyry molybdenum deposits(a) Two porphyry molybdenum prospects are known (8,9).(b) Forcibly emplaced epizonal plutons of biotite, grano-

diorite and adamellite.(c) Anomalous concentrations of lead, zinc, and one sample each

of molybdenum and copper in stream sediment samples.(d) High concentrations of lead, tungsten and tin in pan con­

centrate samples.

?2 Porphyry copper or porphyry molybdenum(a) Very low-grade disseminated occurrence (19) containing

molybdenum and gold located in granodiorite.(b) Aeromagnitic pattern that suggests either compositionally

zoned or an altered pluton that is incompletely exposed.(c) Two stream sediment samples have anomalous gold values.(d) Two pan concentrate samples have high copper values.

Table 1. (continued)

Porphyry copper and/or porphyry molybdenum(a) A prospect (88) containing copper minerals and molyb­

denite disseminated in altered granitic rock is known.(b) A float sample (86) of altered granodiorite with dis­

seminated pyrite is probably from P3. jc) Forcibly emplaced epizonal plutons of biotite granodiorite.[d) Several stream sediment samples contain anomalous concen­

trations of zinc, molybdenum, lead, and copper.(e) Several pan concentrate samples contain high values of

tungsten, bismuth, and molybdenum; one sample contains high values of gold, copper, and silver.

?4 Porphyry copper and/or porphyry molybdenum(a) Float samples containing pyrite, copper-bearing minerals,

or molybdenum in altered granitic rocks or quartz veins (64, 65, 67, 89, 90, 96, 98).

(b) Two prospects reported as gold (95), and copper, gold and silver claims (94) in tonalite; molybdenum-bearing altered granodiorite (66); disseminated sulfides in quartz diorite (50).

(c) Biotite-hornblende tonalite locally grading into quartzdiorite of Late Cretaceous and Jurassic ages; intermixed mosaic of amphybolite, quartz diorite, and granodiorite.

(d) Anomalous stream sediment samples contain lead and copper; one sample each anomalous in molybdenum and tin.

(e) Numerous pan concentrate samples containing high values of molybdenum and copper; several samples contain high tungsten values.

VI(P) Base and precious metal veins and/or porphyry molybdenum deposits(a) Argentiferous galena in quartz veinlets (31) and several

placer gold deposits (32, 33, 34, 35, 36) known.(b) Forcibly emplaced epizonal plutons of biotite granodiorite

exposed in southeastern V,(P) and partially exposed in northwestern V^(P).

(c) Majority of stream sediment samples have anomalous concen­ trations of lead; several samples have anomalous values of gold, copper, silver, and zinc.

(d) High concentrations of lead, arsenic, gold, tungsten,molybdenum copper, tin, and bismuth in pan concentrate samples.

10

Table 1. (continued)

V2 Base and precious metal vein deposits(a) Lode claims for copper and gold, apparently veins (63);

pyritiferous altered andesite dikes contain low values of tin and zinc (62).

(b) Tertiary felsic subaerial volcanic rocks and related shallow intrusives.

(c) Based on aeromagnetics, ^2 is restricted to felsic por­ tions of TV.

(d) Numerous high copper, lead, arsenic, silver, zinc, and molybdenum values in pan concentrate samples; locally high tungsten, bismuth, and tin values.

(e) Local anomalous values of lead, gold, and tin in stream sediment samples.

Mafic to intermediate volcanogenic and copper-in-amygdaloidal- basalt deposits

(a) Numerous copper and related sulfide-bearing prospects and occurrences,of veins and local disseminations in altered intermediate to mafic metavolcanics of upper Paleozoic age (e.g. 17, 27, 48, 76, 81, 82, 92).

(b) Altered sulfide-bearing dikes of felsic volcanics prob­ ably Tertiary in age (15, 16, 70).

(c) Paleozoic marine sequence of dominantly metamorphosed flows and tuffs having basaltic to andesitic composi­ tion; subordinate upper Triassic shallow marine amygdaloidal metabasalts, partially unmapped; locally unmapped Tertiary felsic dikes.

(d) Anomalous concentrations of molybdenum, copper, lead, zinc, gold, and silver in stream sediment samples.

(e) Pan concentrate samples with high values of tungsten,silver, and molybdenum; locally high values of bismuth, arsenic, copper, zinc, lead, and gold.

11

Tabl

e 2.--Grade

and

tonnage

mode

ls for

mineral

depo

sits

of

the

Talk

eetn

a Mountains

quadrangle,

Alas

ka

[Related d

ata

occur

In li

ne f

rom

colu

mn t

o column;

all

tonnages In m

etri

c units; **

, significant

at 1

per

cent

lev

el]

Deposit

Type

Porp

hyry

co

pper

Porp

hyry

molybdenum

Mafic

volcanogenic

massive

sulfide

Felsic a

nd

inte

rmed

iate

volcanogenic

massive

sulfide

Tonnage

and

grade

vari

able

s (units

In p

aren

thes

is)

Tonnage

of "

ore"

(millions

of t

ons)

Average

copp

er g

rade

(p

erce

nt)

Tonnage

of "

ore"

(millions

of t

ons)

Average molybdenum

grad

e (percent)

Tonnage

of "

ore"

(millions

of t

ons)

Average

copp

er g

rade

(percent)

Average

zinc gr

ade

excl

udin

g de

posi

ts w

ithout

re

port

ed g

rades

(percent)

Average

gold a

nd s

ilve

r grades locally

sign

ific

ant

but

not

determined

Tonnage

of "ore"

(millions

of t

ons)

Average

copp

er g

rade (percent)

Average

zinc g

rade

Numb

er o

f Correlation

coef

fici

ent

of

Depo

sits

used

list

ed v

ariable

with

to d

evel

op

variable o

n li

ne w

ith

it

model

in c

olum

n 2

38 38

With tonnage

of "

ore"

=

-0.0

8

34 34

With t

onnage o

f "o

re"

= -.11

37

37

With t

onnage o

f "o

re"

= -.13

19

With t

onnage o

f "ore"

= .03

89

89

With tonnage

of "

ore" =

-.41

**

41

With t

onnage o

f "ore"

= .25

90 p

ercent

of d

epos

its

have a

t le

ast 18.0

0

.10

.27

.07

.24

1.10 .30

.19

.54

1.40

50 p

ercent

of d

eposits

have

at

leas

t 89.0

0

.25

28.0

0

.12

2.30

2.20

1.30

1.90

1.70

3.80

10 p

erce

nt

of d

epos

its

have

at

leas

t

450.

00 .55

430.

00 .24

22.00

.

4.10

5.50

16.0

0

5.40

10.00

excl

udin

g de

posi

ts w

itho

ut

repo

rted

grades

(per

cent

)

Average

lead

gra

de

14

excl

udin

g de

posi

ts w

ithout

re

port

ed l

ead

grad

es (p

erce

nt)

Tonnage

cont

aine

d gold

38

excl

udin

g de

posi

ts w

ithout

repo

rted

gol

d (t

ons

Au)

Tonnage

contained

silv

er

46

excluding

depo

sits

wit

hout

repo

rted

silver

(ton

s Ag)

With t

onnage o

f "ore"

= -.

02

.20

With t

onnage o

f "ore"

= .73**

.27

With t

onnage o

f "ore"

= .82**

5.00

.95

2.90

80.00

4.80

32.0

0

1300.00

Table 3. Mines, prospects, and mineral occurrences in the Talkeetna Mountains quadrangle, Alaska.

Explanatory note

In this report the term "mineral deposits" is used in the broad sense to include deposits, both lode and placer, at mines and prospects as well as unclaimed occurrences, regardless of economic significance. Localities of geochemical rock samples with anomalous metal concentrations have also been included. Geochemical rock samples are considered to be anomalous when out of the selected ten metallic elements, one element greatly exceeds or two or more elements at least reach the following empirically chosen concentration levels (in parts per million): silver--0.7, arsenic 200, gold--0.25, chromium--1,500, copper 1,000, molybdenum--?, lead 70, anti­ mony 300, tin 10, and zinc 500. The sample numbers of these anomalous geochemical rock samples from prospects as well as from unclaimed occur­ rences, including float samples, are given in parentheses in the Principal references column of this table. Complete analytical data for all geochemical rock samples collected by the U.S. Geological Survey in the study area have been reported by Miller and others (1978).

Explanation of table headings

Map no. and name(s) (if known)

Map no. refers to a specific deposit on the accompanying map. Name(s) of prospects or mines are derived from published sources or from gen­ eral usage. In several cases, more than one prospect or occurrence is grouped under the same map number.

Location

Location refers to the'standard township and range land designations relevant to specific parallels and meridians on the U.S. Geological Survey quadrangle map used as a base for this report.

Category

M -- mine P -- prospect 0 -- occurrence

The terms mines, prospect, and occurrences are used as follows:

Mine -- a mineral deposit with recorded production. Ore was mined but not necessarily shipped.

Prospect -- a deposit which has been- staked and, in many cases, has been scantily explored; lacks evidence of production. Claims may or may not be active. Some of tiie.placer gold deposits that

13

Table 3. (continued)

are listed as prospects probably have had at least meager pro­ duction but, because of lack of definitive evidence, they are classified as prospects.

Occurrence generally a minor deposit that, as far as known, is unclaimed and is mainly known from recent U.S. Geological Sur­ vey field investigations or from the analyses of geochemical rock samples. Also includes the locations of float samples with anomalous concentrations of metals. The criteria for anomalous geochemical rock samples are discussed in the Explan­ atory note of this table.

Resource(s) (minor constituents or potential byproducts in Parentheses)

Indicates commodity or commodities that are known or reported at each locality. Question marks are used where presence of commodity is inferred from indirect evidence or based on unverified reports. Commodities are listed in decreasing order of probable commercial value or of abundance in the deposits. Metallic commodities are denoted by standard chemical symbols.

Form

Type

Denotes the physical aspect of a deposit. Queried where uncertain. Left blank for occurrences based on mineralized rock samples found only in float.

Rather speculative designation concerning the genesis of the deposit. Queried where based on insufficient information. Left blank for mineralized rock samples found only in float.

Brief description

Provides brief descriptions of the geology and mineralogy of the deposits and, where applicable, production data. Several prospects are known only from a U.S. Bureau of Mines claim map (1973); infor­ mation of these is generally limited to reported commodities and category of deposit.

Principal references

Cites sources for information used in the table and map. For pros­ pects and occurrences known primarily from analyzed geochemical rock samples reported by Miller and others (1978), the sample field numbers are given in parentheses.

Abbreviations used

Standard chemical symbols are used;'for example, Cu - copper, Au - gold, Sn - tin.

14

MINES, PR

OSPE

CTS, A

ND M

INER

AL O

CCUR

RENC

ES IN

THE TALKEETNA

MOUNTAINS

QUAD

RANG

LE,

ALAS

KA

RESOURCE (S)

Mi

nor

cons

tl tu-

HAP

NO.

AND

NAME(S)

LOCATION

CATE

GORY

ents o

r po

tent

ial

FORM

(If

known)

byproducts 1n

pa

rent

hese

s

1 T.33N..R.4U.

P Ag,As,Mo(Pb,Au)

Diss

emin

ated

2 T.22S..R.12U.

P Au(Ag)

Vein

3 T.22S..R.12H.

P Au

Vein

4 T.22S..R.12W.

P Sn(Ag.As,Cu,Mo,

Diss

emin

ated

Zn.Pb)

S T.32N..R.2W.

0 Cr(Pb)

Diss

emin

ated

6 T.32N..R.2W.

P Cu(Au)

Vein?

7 Mi

nt

T.32

N..R

.1E.

M

Sb,A

g,Cu

,As(

Pb,

Velnlets

Au)

8 T.J2N..R.1E.

P Mo

(Cu.

Zn)

Diss

emin

ated

TYPE

Hydr

o thermal

Hydro t

hermal

Hydr

o thermal

"Porphyry

tin"

Meta

morp

hlc?

Hydrothermal?

Hydrothermal

Hydro thermal

,po

rphy

ry?

PRINCIPAL

BRIE

F DESCRIPTION

REFE

RENC

ES

Smal

l py

rlte

-bea

rlng

min

eral

- Mi

ller

and

lied

zon

e In b

reed

a ted

chert

others,

1978

and ar

gllH

te o

f unit J

ta.

(sample

no.

Seve

ral

claims In a

djac

ent

area

75Nw

095)

; U.S.

Bur.

Mines. 1973

Lode c

laims

1n c

hert a

nd a

rgil

- U.S. Bur

Mines.

llte o

f un

it J

ta

1973;

MacKevett

and

Holl

oway

,1977

_. ....-do...-... ..

...

....

. Do.--

Primarily

tin mineralization

Reed

. 1978

(cas

sUer

lte)

In sm

all

outcrop

of g

relsenlzed T

ertiary

granitic

Intrusive

Into u

nit

DSga

Scat

tere

d pyrlte In

altered

Miller a

ndco

ntac

t metamorphosed ar

gllH

te

others,

1978

and

gray

wacke

of u

nit

Kag;

adja-

(sample

no.

cent to Te

rtia

ry g

rani

tic

Intru- 75

Nw00

3A)

slon

Lode c

laims

In small

Tert

iary

MacKevett

and

gran

itic

In

trus

ion

Holl

oway

. 19

77;

U.S. Bur. Mines.

1973

Pyrargyrlte

and

mlargyrlte.

Capp

s and

Short,

alon

g wi

th m

inor

amounts o

f 19

26;

Rlch

ter,

othe

r su

l fi

des,

1n q

uartz

vein-

1963

; Berg a

ndlets cutting ar

gllH

te o

f unit

Cobb,

1967

, p.

Kag.

Some

production.

Sev-

27;

Cobb.

1972;

eral lo

de c

laim

s In a

djacent

MacKevett

and

area

s Ho

llow

ay,

1977

Molybden

ite, pyrlte,

mino

r Rlchter, 1963

chalcopy

rlte.

and

spha

leri

te In

I

Q> cr (D CO o o 3 ri- 13 c n> o.

9 Tr

easu

re C

reek

T.32N..R.1E.

slllclfl

ed shear

zone w

ithi

n Tertiary granitic Intrusion

Mo(Cu.Au.Zn)

Vein a

nd

Hydrothermal

Molybdenite

and

associated s

ul-

velnlet

fides

In c

ontact m

etamorphosed

argllHte a

nd g

raywacke o

f unit

Kag; ad

jace

nt to T

ertiary

gran

­ itic Intr

usion

Do.

MINE

S, PR

OSPE

CTS,

AND

MINERAL

OCCU

RREN

CES

IN T

HE TALKEETNA

MOUN

TAIN

S QU

ADRA

NGLE

, AL

ASKA

(c

onti

nued

)

HAP

NO. AN

D NA

ME(S

) LOCATION

(If

known)

RESO

URCE

(S)

Minor

cons

tltu

- CATEGORY

ents o

r potential

FORM

TYPE

byproducts In

parentheses

PRIN

CIPA

L BR

IEF DESCRIPTION

REFE

RENC

ES

10T.

33N.

.R.7

W.(Au.Ag)

Vein

Hydrothermal

Smal

l quartz v

eins

In a

rgllHtt

HUler

and

of u

nit

Kag.

No visible

ore

others.

1978

mine

rals

(s

ampl

e no.

75NW132)

11 12 13 14 IS

T.32N..R.4E.

0

T.22S..R.5H.

P

T.22S..R.3U.

0

Mo(Pb)

Au

Au(Ag)

Diss

emin

ated

Hydrothermal?

Diss

emin

ated

Placer

Disseminated

Hydrothermal

T.22S..R.2U.

0(Mo)

Disseminated?

Hydrothermal?

T.22

S..R

.2U

. 0

Ag(

Mo.

Au)

D

isse

min

ated

P

orph

yry?

Sca

ttere

d pyrlte

In

mic

a sc

his

t ad

jace

nt

to T

ert

iary

g

ran

itic

In

trusi

on

Sev

eral

cl

aim

s In

cre

ek b

ed.

Surf

ldal

depo

sits

are

too

sm

all

to

show

at

the

scal

e of

geol

ogic

nap

Pyr

lte a

nd q

uart

z In

altera

tion

zone

with

in T

ert

iary

gra

nitic

In

trusi

on

Low

-gra

de.s

ulfi

de-b

earin

g

alte

ratio

n

zone

In

maf

ic r

oeta

- vo

lcan

lc

rock

s of

un

it Tk

v

Smal

l su

lfid

e-b

ea

rin

g a

ltera

­ tio

n z

one

In fe

lslc

vo

lcan

ic

dike

In

trudin

g m

afic

met

avol

­ ca

nic

rock

s of

unit t

iv

Mill

er

and

othe

rs,

1978

(s

ampl

e no

. 77

Cy0

16B)

U.S

. Bu

r. H

ints

, 19

73DI

cr n>

Mill

er

and

oth

ers

, 19

78

(sam

ple

no.

73S

t007

0);

T.

E.

Sm

ith,

written c

ooro

un.,

1973

Mill

er

and

oth

ers

, 19

78

(sam

ple

no.

73S

tl035

);

T.C

. S

mith

, w

ritt

en

co

iranu

n.,

1973

Mill

er

and

oth

ers

, 19

78

(sam

ple

nos.

73

Stl0

30,

73S1

0040

); T.

E.

S

mith

, w

rit­

te

n co

mm

on.,

1973

o

o 3 c

n>

o.

)6T.22S..R.2W.

P(Cu)

Diss

emin

ated

Porphyry?

Low-

grad

e, cha

lcop

yrlt

e-be

arin

g mineralized

felslc volcanic

dike cutting

mafic

meta

volc

anlc

ro

cks

of u

nit

T<v

HacKevett

and

Holl

oway

. 1977}

U.S. Bu

r. Hlnes,

1973

NINE

S, PR

OSPE

CTS.

AND M

INER

AL O

CCUR

RENC

ES I

N THE

TALK

EETN

A MO

UNTA

INS

QUADRANGLE,

ALASKA

(co

ntin

ued)

MAP

NO.

AND

NAME(S)

LOCA

TION

CA

TEGO

RY

(If

known)

17

T.33N..R.9E.

0

18

Lichtn

T.32

N..R

.11E

. P

19

T.32

N..R

.9E.

0

20

T.32

N..R

.9E.

0

21

T.32N..R.9E.

0

RESO

URCE

(S)

Minor

constitu­

ents o

r po

tent

ial

FORM

TYPE

bypr

oduc

ts In

parentheses

Cu

Diss

emin

ated

? Vo

lcan

ogen

lc?

Cu(A

u.Ag

) Disseminated

Subm

arin

eand

veln

let

volc

anog

enlc

(Mo.

Au)

Disseminated

Porphyry?

Hydr

othe

rmal

?

As(A

g.Pb

)

Ag(A

$.Mo

,Sn,

Au)

BRIEF

DESC

RIPT

ION

Low-gr

ade

copper m

iner

aliz

a­tion In

maf

ic m

etavolcanlc

rock

s of

uni

t "fo

v

Chal

copyrlte.

born

He. a

ndother

copp

er m

iner

als

scat

tere

dIn

a m

afic m

etavolcanlc

flow

of

unit P

zv.

Mine

rali

zed

zone

extend

s fo

r about

900 n. a

nd I

tIs less

than

2

wide

Very l

ow-grade, sul fide-bearing

mine

rali

zed

zone

in

quartz

dlorlt

e of u

nit

TKg

Dissemin

ated

sul fid

e mi

nera

lsIn f

loat

of

mafic

meta

volc

anlc

rock

Dissemin

ated

fine-grained

sul-

fide min

eral

s In

float o

f mafic

metavolcanlc r

ock

PRIN

CIPA

L REFERENCES

Mill

er a

ndothers,

1978

(sample

no.

73SU

050)

; T. E.

Smith, w

ritt

enco

mnun

., 19

73

Smit

h an

d others,

1975

Mill

er a

ndothers.

1978

(sam

ple

no.

73St

0164

); T

. E.

Smith, w

ritt

encomroun.,

1973

Miller a

ndothers.

1978

(sam

ple

no.

73S1

1107

); T

. E.

Smit

h, written

comm

un.,

19

73

Miller a

ndot

hers

. 1978

(sample

no.

73SU

099)

; T. E.

Smith, w

ritt

encommun.

, 19

73

-H O* cr n> CJ o o 3 =3 C n>

o.

22T

.32N

..R.8

E.

0A

g(M

o.P

b.S

n.Zn

)D

isse

min

ated

, H

ydro

ther

mal

? ve

in?

Ver

y lo

w g

rade

, su

lfid

e-b

eari

ng

m

iner

aliz

ed

zone

In

maf

ic

to

Inte

rmed

iate

met

avol

canl

c ro

cks

of

un

it P

zv

Mille

r an

d o

ther

s.

1978

(s

ampl

e no

s.

73S

t110

0,

73S

U10

1);

T.

E.

Sm

ith,

wri

t­

ten

com

mun

., 19

73

MINES, PR

OSPE

CTS,

AN

D MI

NERA

L OCCURRENCES

IN T

HE T

ALKEETNA M

OUNT

AINS

QUADRANGLE, AL

ASKA

(continued)

HAP

NO.

AND

NAME(S)

(If

known)

RESO

URCE

(S)

Mi

nor

constltu-

LO CA

T I ON

CATEGORY

ents o

r potential

FORM

TYPE

byproducts In

parentheses

PRINCIPAL

BRIEF

DESC

RIPT

ION

REFERENCES

23 24

oo

25 26 27 28 29

T.32N..R.9E.

T.32N..R.8E.

0

T.32N..R.8E.

T.31N..R.9E.

T.30

N..R

.7E.

T.31N..R.3E.

T.30

N..R

.3E.

(Ag.Mo.Zn)

(Ag.Mo)

Cu

(Cu.Au)

(Ag) Au Au

Diss

emin

ated

Hydrothermal?

Disseminated,

Hydrothermal?

mass

ive,

and

vein?

Veln

let

Vein

Hydrothermal

Hydrothermal

Diss

emin

ated

Pl

acer

Diss

emin

ated

Placer

Float

of a

ltered m

afic

to

Inter- M

iller

and

mediate

meta

volc

anlc

rock

othe

rs,

1978

(sample

no.

73St

)104

h T.

£.

Smit

h, w

ritten

coro

mun.

, 19

73

Very l

ow g

rade

, su

lfid

e-be

arin

g mi

nera

lize

d sh

ear

zone I

n mafic

to I

ntermediate

metavolcanlc

rocks

of u

nit

Pzv

Copper minerals, m

ainl

y chal-

copyrlte,

within a

n extensive

shea

r zone a

long

contact

betw

een

unit

s Iw an

d Pz

v

Minor

chalcopyrlte a

nd p

yrlte

In s

mall qu

artz

vei

n cutting

mafic

metavolcanlc r

ocks o

f unit P

zv.

Exposures

too

small

to s

how

on g

eolo

gic

map

Minor

pyrl

te I

n sm

all

quartz

vein c

utting m

afic

metavol-

ca

nlc

rocks of

uni

t Pzv

Plac

er cla

im at

the mo

uth

of

smal

l tributary

of S

uslt

na

River

Placer c

laim alo

ng s

mall

creek

Incised

Into

extensive Q

uater­

nary

surflclal deposits

Miller a

nd

othe

rs,

1978

(sample

nos.

73Stll03,

73StllOSH

T. E.

Smith, writ­

ten

comm

un..

1973

MacKevett

and

Holl

oway

. 1977;

U.S. Bur. Mines.

1973

Miller a

nd

othe

rs.

1978

(sam

ple

no.

7TM276)

Miller a

nd

others,

1978

(sam

ple

no.

72Cy03B)

U.S. Bur. Mines.

1973

(u

cr n>

co o 3 C n>

ex

MINES. PR

OSPE

CTS.

AND

MIN

ERAL

OCC

URRE

NCES

IN

THE

TALKEETNA

MOUN

TAIN

S QUADRANGLE,

ALASKA (

continued)

MAP

NO.

AND

NAME(S

) LO

CATI

ON

CATE

GORY

(I

f known)

30

T.3DN..R.2E.

P

31

Inly

T.30N..R.1W.

P

32

T.31N..R.2W.

P

33

Susl

tna

River-

T.31N..R.2H.

PGold C

reek

34

T.29-30N..R.2H.

P

35

T.28-29N..R.3H.

P

1H

T 9RM

D AU

0JO

1 CON. .K.4W.

r

17

T 90 M

D 1U

DJ/

I.CON..K.JN.

r

38

T.27-28N..R.3-4W.

P

RESOURCE(S)

Mino

r constitu­

ents o

r potential

bypr

oduc

ts In

pa

rent

hese

s

Au

Ag.P

b

Au Au Au Au Au Au Au

FORM

TYPE

Disseminated

Plac

er

Vein

Hydr

o the

rmal

Disseminated

Placer

Disseminated

Placer

Disseminated

Placer

Disseminated

Placer

Disseminated

Placer

Disseminated

Placer

Disseminated

Placer

BRIEF

DESC

RIPT

ION

Placer claim alo

ng s

mall

creek

Incised

Into

ext

ensi

ve Qua

ter­

nary

sur

flcl

al de

posi

ts

Argentiferous

galena 1n

quartz

velnlets t

hat cu

t an a

lter

edfels

lc v

olcanic

dike

1n r

ocks

of u

nit

Kag

Several

placer cla

ims

alon

gcr

eek

1n a

lluv

ium

too

smal

lto

sho

w on

geo

logi

c ma

p

Gold

pla

cers

sporadically

ex­

plor

ed f

or man

y ye

ars;

pos

sibl

ytoken

prod

ucti

on.

Location

show

n on m

ap I

s on

ly a

ppro

xi­

mate

Plac

er c

laims

along

uppe

r Ch

u-nl

lna

River

In a

lluvial

de­

posits too

smal

l to

show

ongeologic map

Plac

er c

laim

s 1n a

lluv

ium

too

small

to s

how

on g

eolo

gic

map

. do

. -

do

.

Plac

er claims

In a

lluv

ium

along

PRIN

CIPA

L REFERENCES

U.S. Bu

r. M

ines.

1973

Berg and

Cobb,

1967

. p. 27

MacK

evet

t an

dHo

llow

ay,

1977;

U.S. Bu

r. Mi

nes.

1973

Capps. 1919d, p.

231;

Cob

b. 1

972

MacK

evet

t an

dHo

llow

ay.

1977;

U.S. Bur. M

ines

.1973

Do

.

. DO

.

f\_

Do

. -

-i o> cr _j

n> co o o 3 rf 3 C n> Q. ^ '

39 40 41

T.27N..R.3-4H.

T.28N..R.2E.

T.2BN..R.2E.

Au

Disseminated

Plac

er

(Ag.

Au.P

b)

Diss

emin

ated

Hydrothermal

Zn

Diss

emin

ated

Hy

drot

herm

al

Chunllna R

iver

Plac

er c

laim

s In a

lluvium

too

smal

l to

sho

w on

geo

logi

c ma

p D

o.

Very

fin

e g

rain

ed d

isse

min

ated

. M

ille

r an

dp

yrlt

e-b

earl

ng

gos

san

alon

g ot

hers

. 19

78sh

ear

zone

1n

maf

ic m

etav

ol-

(sam

ple

no.

canl

c ro

cks

of

un

it P

zv

7SCy

lOSB

)

Pyr

lte-

bea

rln

g g

ossa

n In

sh

eare

d m

etaa

ndes

lte o

f u

nit

Pz

v

Mil

ler

and

othe

rs.

1978

(s

ampl

e no

. 75

Dr0

07)

MINE

S, PROSPECTS, A

ND M

INERAL O

CCUR

RENC

ES IN T

HE TA

LKEE

TNA MO

UNTA

INS

QUAD

RANG

LE,

ALAS

KA (c

onti

nued

)

MAP

NO

. AN

D N

AME(

S)

LOCA

TIO

N CA

TEGO

RY(I

f kn

own)

42

T.2

8N..R

.2E

. 0

RESO

URCE

(S)

Min

or c

on

stitu

­en

ts o

r p

ote

ntia

l FO

RM

TYPE

bypr

oduc

ts

Inpa

rent

hese

s

Mo,

Ag(

Pb.

Sn,

As)

D

isse

min

ated

H

ydro

the ra

il

BRIE

F DE

SCRI

PTIO

N

Dee

p-re

d to

lig

ht-

bro

wn

, pyrltt-

bear

lng,

ext

ensi

ve g

ossa

n In

ap

ha

nltl

c In

term

edia

te m

eti-

volc

anlc

ro

cks

of

un

it P

zv

PRIN

CIP

ALRE

FERE

NCES

Mill

er

and

oth

ers

, 19

78(s

ampl

e no

s.TM

0287

RD

.75

Dr0

14,

75M

S011

)

43T

.29N

..R.3

E.

0C

u(A

u.M

o)

Vei

n,

dls

- H

ydro

ther

mal

se

min

ated

ro

o

44 4S

T.28N..R.3E.

T.28N..R.4E.

Cu(Zn)

Disseminated

Volcanogenlc?

Ag.Cu

Disseminated

Hydr

othe

rmal

?

Quartz v

elnl

ets

with

pyrlte

cuttin

g py

rlte

-bea

rlng

alt

er­

atio

n zone,

cont

aini

ng s

ome

malach

ite

stai

ns.

In m

afic

metavolcanlc r

ocks

of

unit P

zv.

Extent o

f mi

nera

lize

d altera­

tion z

one

appe

ars

to b

e sm

all

Altere

d mafic

meta

volc

anlc

rocks of

unit

Pzv.

No

visi

ble

ore

minerals

Small breed a t

ed s

hear z

one,

with l

lmon

lte

and

mala

chit

e.

1n m

afic m

etav

olca

nlc

rock

s of

unit

Pzv

Miller a

nd

othe

rs,

1978

(sample

nos.

72Cy

073,

72

Cy06

1)

Miller a

nd

others,

1978

(sam

ple

no.

74Cy

062)

Mill

er a

nd

othe

rs,

1978

(sam

ple

no.

7SNw

l41)

cr

n>

co.

o o 3

rt C n>

o.

MINES, PROSPECTS, AN

D MI

NERA

L OC

CURR

ENCE

S IN

THE

TALKEETNA

MOUNTAINS

QUAD

RANG

LE,

ALAS

KA (continued)

MAP

NO.

AND

NAME

(S)

LOCA

TION

CATEGORY

(If

known)

46

T.28

N..R

.4E.

0

47

T.2B

N..R

.5E.

0

48

T.2B

N..R

.5E.

P

49

T.2BN..R.5E.

0

50

T.28

N..R

.5E.

0

51

T.2B

N..R

.5E.

0

52

T.28N..R.5E.

0

53

T.28

N..R

.9E.

P

54

T. ION. ,R. 10

H.

0

55

T.26N.R.1DE.

P

56 Go

ld Creek

T.25

-26N

..R.

9E.

P

RESOURCE (S)

Minor

cons

titu

­ ents o

r potential

bypr

oduc

ts in

parentheses

Cu

(Au.Ag)

Cu Cu

(Cu, Au.Ag)

(Ag.Cu)

(Cu)

Au(Pt)

(Zn) Au Au

FORM

Diss

emin

ated

Diss

emin

ated

Diss

emin

ated

Vein,

repl

acem

ent

Disseminated

...

Velnlets.

diss

emin

ated

Diss

emin

ated

Diss

emin

ated

Disseminated

Diss

emin

ated

TYPE

Hydr

othe

rmal

Hydr

othe

rmal

Volc

anog

enlc

?Hydrothermal?

Hydr

othe

rmal

?Su

bmar

ine

vol-

cano

genl

c?

Hydrothermal?

Porp

hyry

?

...

Hydrothermal?

Plac

er

Porp

hyry

?

Placer

Placer

BRIEF

DESC

RIPT

ION

Mino

r chalcopyrite and p

yrite

in s

mall a

lter

atio

n zone wit

hin

argi

lllt

e of u

nit

Pzv

Scattered

pyri

te I

n altered

phylllte o

f unit P

zv

Copp

er minerals

and

pyrite I

nma

fic

metavolcanic r

ocks o

funit P

zv

Pyrr

hotite a

nd c

halcopyrite

within g

reenstone of u

nit

Pzv.

Exte

nt o

f mi

nera

lize

d zone I

ssm

all

Minor

pyri

te,

pyrr

hoti

te,

and

chalcopyrite;

disseminated i

naltered

gneissose

quartz d

lo-

rlte

of

unit 4

pm

Floa

t of

vei

n quartz wit

hpy

rite

and c

halcopyrite

Minor

pyrrhotite a

nd c

halco­

pyrite.

disseminated a

nd I

nve

inle

ts c

utti

ng a

ltered

metagabbro o

f un

it P

zv

Placer c

laims

alon

g upper

Busc

h Creek

Inci

sed

into

extensive

Quaternary s

ur-

fldal

depo

sits

Smal

l felslc v

olcanic

dike

with t

races

of p

yrite. cut

ting

greenstone of

unit

Jpm

Seve

ral

plac

er c

laim

s along

Oshetna

Rive

r

Several

placer c

laim

s along

Gold

Cre

ek I

n Quaternary a

llu­

vium t

oo s

mall

to

show on

geol

ogic

map

PRIN

CIPA

L REFERENCES

Rose

. 19

67.

p. 5

Rose,

1967

. p. 4

MacKevett

and

Holl

oway

, 19

77

Rose,

1967

. p. 5

Rose.

1967

. p.

4

Anderson,

1969.

p. 10

-12

Rose

, 1967.

p. 4

U.S. Bu

r. Mi

nes.

1973

Mill

er a

ndothers.

1978

(sam

ple

no.

77Cy

070B

)

U.S. Bu

r. Mines,

1973

Chapln,

1918

. p.

64;

U.S. Bur.

Mines. 1973;

Cobb,

1972

-H cr CD CO O O =1 sj c CD 0.

*"-**

MINES, PR

OSPE

CTS,

AND

MINERAL O

CCURRENCES IN

THE T

ALKEETNA MOU

NTAI

NS Q

UADR

ANGL

E. A

LASKA

(continued)

ro

ro

HAP

NO.

AND

NAME

(S)

LOCATION

CATE

GORY

(1

f kn

own)

57

Granite

Cr««

k T.26N..R.9E.

P

58

T.26N..R.8E.

0

59

T.26

N..R

.8E.

P

60

Roaring

Creek

T.25

N..R

.8E.

P

61

T.25N..R.5E.

P

62

T.26

N..R

.6E.

0

63

T.26

N..R

.4E.

P

RESO

URCE

(S)

Mino

r constitu­

ents o

r potential

FORM

bypr

oduc

ts In

parentheses

Au

Disseminated

Zn

Veln

lets

Cu(Au)

Vein?

Au

Disseminated

Au

Disseminated

(Sn.Zn)

Disseminated

Cu?,Au?

Veins?

TYPE

Placer

Hydrothermal

Hydrothermal?

Placer

Placer

Porphyry?

Hydrothermal?

BRIEF

DESCRIPTION

Plac

er c

laim

alo

ng l

ower

Granit

e Creek

Llmo

nlte

and

pyr

ite

along

frac­

tures

1n s

mall

go

ssan

wit

hin

metaan

desl

te of

unit J

tk

Lode c

laim

s In g

rani

tic

rocks

of u

nit Jp

m

Plac

er c

laims

alon

g lower

Roaring

Cree

k

Seve

ral

placer claims

Tertia

ry,

pyrltlferous,

alter­

ed a

ndeslte

dike

s cu

ttin

gdlorlt

e of u

nit Jp

m

Lode c

laims

In T

ertiary

vol­

canic

rock

s

PRIN

CIPA

L REFERENCES

Chap

ln,

1918.

p. 6

4

Miller a

ndothers,

1978

(sample

no.

77Cy

080)

U.S.

Bu

r. M

ines.

1973;

MacK

evet

tan

d Ho Ho wa

y.1977

Chap

ln.

1918.

p. 64

U.S. B

ur.

Mines.

1973

Mill

er a

ndothers,

1978

(sample

no.

74Cy

078A

)

U.S.

Bur. Mines.

1973

; Ma

cKev

ett

and

Ho How

dy,

1977

I

o» cr n> CO o o =3 r* :a £= tt> a.

MINES. PROSPECTS, AN

D MINERAL

OCCURRENCES

IN T

HE T

ALKEETNA M

OUNTAINS Q

UADR

ANGL

E, A

LASK

A (continued)

ro CO

MAP

NO.

AND

NAME

(S)

LOCATION

CATE

GORY

(If

known)

64

T.26N..R.3E.

0

6$

T.26

N..R

.3E.

0

66

T.25N..R.3E.

0

6?

T.25N..R.3E.

0

66

T.25N..R.3E.

P

69

T.25

N..R

.2E.

0

70

T.26N..R.2E.

0

71

East

view

T.26N..R.2E.

P

72 Phoenix

T.26N..R.2E.

P

RESOURCE(S)

Minor

constitu­

ents o

r po

tent

ial

FORM

bypr

oduc

ts In

pa

rent

hese

s

Ag.Cu(Au)

Cu(Sn)

(Mo)

Velnlets

Cu(Pb.Au)

Cu

Vein

?

Co.C

r,N1

(Zn.

Disseminated

Au)

Ag.M

ofPb

.Zn,

Disseminated

Au) Cu

Vein

Cu

Vein

TYPE r

Hydr

o the

rmal

Hydr

o the

rmal

?

Magroatlc? a

nd

(or)

hydro-

thermal?

Hydr

othe

rmal

?

Hydr

o the

rmal

Hydr

o thermal

BRIEF

DESC

RIPT

ION

Float

of v

ein

quartz w

ith

py-

rlte

, ch

alco

pyrl

te,

and

pos­

sibly

pyrrnotlte

Floa

t of

vei

n quartz w

ith

pyrlte a

nd malachite s

tain

s

Pyrl

te-b

eaHn

g qu

artz

vel

nlet

s 1n

altered g

ranodlorlte

of

unit

Jpr

a

Float

of p

yrlte

and

malachite-

bear

ing

alte

red

granitic r

ock

Copper m

inerals, m

ainl

y mala­

chit

e. In

bre

ccia

ted

gran

itic

rocks

of u

nit

Jpm.

Si

te o

f diamond

drilling I

n early

1970

* s.

Seve

ral

claims I

n ar

ea

Alte

red

mafi

c metavolcanlc r

ock,

po

ssib

ly s

erpentlnlte, o

f un

it

Pzv.

No v

isib

le o

re m

iner

als

Altered,

pyr

lte-

bear

Ing

f el s

ic

dike

of

unit

TV

cutting

mafi

c metavolcanlc r

ocks

of

unit P

zv

Quartz v

eins

, wi

th p

yrlte

and

chalcopyrlte,

cutt

ing meta-

andeslte o

f un

it P

zv

Chalcopyrlte,

hematite,

minor

bornlte. a

nd q

uart

z In v

ein-

PR IN

C I PA

L RE

FERE

NCES

Miller a

nd

othe

rs.

1978

(sam

ple

no.

TM00

66RA

)

Miller a

nd

others,

1978

(sam

ple

no.

73Cy

l26)

Miller a

nd

othe

rs,

1978

(sample

no.

TM0103RB)

Miller a

nd

othe

rs.

1978

(sample

no.

TM0104R)

MacKevett

and

Ho How

ay.

1977;

U.S. Bur. M

ines

. 1973

Miller a

nd

othe

rs.

1978

(s

ampl

e nos.

TM0050RA.

TM00

50KB

, TM

OOSO

RC)

Milter and

othe

rs.

1978

(sample

nos.

TM0107RB,

TM01

07RE

)

Capp

s. 19

l9b.

p.

20

3

Capp

s. 19

19b,

p.

20

2

CU cr

n> 3.

(continued)

lets c

utti

ng s

heared m

eta-

ande

slte

of

unit

Pzv

MINE

S. PR

OSPE

CTS.

AND

MIN

ERAL

OCC

URRE

NCES

IN

THE T

ALKE

ETNA

MOUNTAINS Q

UADR

ANGL

E. A

LASKA

(con

tinu

ed)

ro

RESO

URCE

(S)

Mino

r co

nstk

u-

MAP

NO.

AND

NAME(S)

LOCATION

CATE

GORY

ents o

r potential

(If

know

n)

bypr

oduc

ts In

parentheses

73 Bl

ue L

ode

T.26

N..R

.2E,

P

Cu

74

Ice Creaa

T.26

N..R

.2E.

P

CuMo

unta

in,

Rainbow Lake

75 Ta

lkee

tna

T.26N..R.2E.

P Cu.Ag(Au.Mo)

76

T.26N..R.2E.

P Cu

"

T.26

N..R

.3E.

0

Cu(Pb)

FORM

TYPE

Vein,

Hydrothermal

repl

acem

ent

Vein

? Hydrothermal 1

Vein,

Hydrothermal

disseminated

Vein

? Hydrothermal

Disseminated?

Diss

emin

ated

. Hydrothermal

vein

BRIE

F DE

SCRI

PTIO

N

Chal

copy

rlte

and

bornlte 1

ngo

uge

within met

aand

eslt

e of

unit

Pzv

Seve

ral

lode cla

ims

1n m

afic

meta

volc

anlc

rocks o

f unit

Pzv.

Probably s

tme

geol

ogic

cond

itions a

s In t

he E

astv

lew.

Phoe

nix,

and

Blue

Lode

claims

Repl

acem

ent

lodes

alon

g shear

zone

s an

d In a

djacent

wall

rock

of ma

fic

metavolcanlc

rock

s of

unit

Pzv.

Th

e lodes

cont

ain

Chal

copy

rlte

, he

mati

te.

pyri

te,

and

quar

tz.

Several

lode

claims

1n a

rea

Several

lode

claims

1n m

afic

meta

volcanlc r

ocks

of

unit P

zv

Smal

l re

plac

emen

t lo

des

and

veln

lets w

ith

Chalcopyrlte 1

nalte

red mafic

metavolcanlc

rock

s of u

nit

Pzv

PRIN

CIPA

L REFERENCES

Capp

s. I9

19b.

p. 202-203

U.S.

Bu

r. M

ines

,19

73

Capp

s. 1919b. p

.20

3-20

4; M

iller

and

othe

rs,

1978

(sam

ple

nos.

73Cyl23, 7S

Cy12

7)

U.S. Bur. Mi

nes.

1973

Mill

er a

ndot

hers

. 19

78(s

ampl

e no.

73Cy

l22)

-H

cu cr n> CO

* o o 3 <-*

=3 C a.

MINES, PROSPECTS, A

ND MIN

ERAL

OCC

URRE

NCES

IN

THE T

ALKEETNA H

OUNT

AINS

QUA

DRAN

GLE.

ALASKA

(continued)

f\3

cn

MAP

NO.

AND

NAME(S)

LOCA

TION

CA

TEGO

RY

(If

know

n)

78

T.27

N..R

.3E.

0

79 Copper W

onde

r T.

26N.

.R.2

E.

P

60

T.26

N..R

.2E.

0

81

Copper K

ing

T.26

N..R

.1E.

P

82

Iron C

reek,

T.26

N..R

.1E.

P

Morning

Star

83 Co

pper

Que

en

T.26

N..R

.1E.

P

84

T.27N..R.2E.

0

85

T.27N..R.1E.

P

86

T.27N..R.1E.

0

RE SO

URCE (S

) Minor

constitu­

ents o

r potential

bypr

oduc

ts In

parentheses

(Cr)

Cu(Fe)

Zn(Pb.Au)

Cu.A

u.Ag

Cu

Cu.Au

Cu,A

g(Au

,Zn,

Pb)

Au (Mo)

FORM

TYPE

Disseminated

Volc

anog

enlc

?

Vein

, Hy

dro t

herm

alre

plac

emen

t

Vein,

Hydrothermal

disseminated

Diss

emin

ated

, Hydrothermal

vein

s

Veins?

Hydrothermal?

Diss

emin

ated

. Hydrothermal

replacement

Vein

Hydrothermal

Disseminated

Placer

...

...

BRIEF

DESC

RIPT

ION

Alte

red

mafi

c me

t* vo

lcan

icrock

of

unit

Pzv

. No

vis

ible

ore

Minerals

Chal

copy r

ite,

hem

atit

e, pyrlte,

and

quar

tz I

n a

zone

of

shea

red

meta

andeslte of

unit

Pzv

Diss

eminated p

yrlt

e an

d Qu

artz

veln

lets In

alt

ered

mafic m

eta-

volc

anlc

roc

k of

uni

t Pz

v

Chal copy r

ite, h

emat

ite,

pyrlte,

and

quar

tz I

n zo

ne o

f sh

eare

dmetaan

desl

te o

f un

it P

zv

Severa

l lo

de c

laim

s In

maf

icme ta

volc

anic

roc

ks o

f un

it P

zv.

Geolog

ic c

onditions

probably

simi

lar

to t

hat

of t

he

Copp

erKing

claim

Pyrlte,

chal

copy

rlte

. ar

seno

-pyrl

te,

and

quar

tz I

n a

zone of

sheared

and al

tere

d mafic

meta

-volcan

lc r

ocks o

f un

it P

zv.

Expo

sure

1s along

the

bank

of

Iron C

reek I

n a

rock

bluff t

oosmall

to s

how on g

eolo

gic ma

p

Quartz

vein, a

bout 6

0 cm t

hick

.wi

th c

halcopyrlte, p

yrlte, a

ndmalach

ite

stai

ns.

Coun

try

rock

Is m

afic m

eta v

olcanic

rock o

funit P

zv

Placer

claims

along

smal

l creek

In a

lluv

ium

too

smal

l to

show

on g

eologic ma

p

Float of

alt

ered

granodlorlte

with

disseminated

pyrl

te

PRIN

CIPA

L RE

FERE

NCES

Miller a

ndothers,

1978

(sample

no.

TM00

57R)

Capps, 19

19b.

p. 201-202

Mill

er and

others.

1978

(sample

no.

7SCy044)

Capps, 19

19b.

p. 201

U.S. Bu

r. M

ines

.1973

Capps, 1919b, p

.199-201

Mill

er a

ndot

hers

. 1978

(sam

ple

nos.

73Cy

l24,

7SCy009A)

U.S. Bu

r. M

ines.

1973

Mill

er and

othe

rs,

1978

(sam

ple

no.

TM184RB)

-H o>

cr n> CO 'rT o 3

r* _ i.

=3

C n>

0. **-"

NINES, PROSPECTS. A

ND M

INER

AL O

CCUR

RENC

ES I

N THE TA

UEET

NA M

OUNTAINS Q

UADR

ANGL

E, A

LASK

A (continued)

ro

en

HAP

NO.

AND

NANE(S)

LOCA

TION

CA

TEGO

RY

(If

know

n)

87

T.26N..R.1W.

0

88

T.2S

N..R

.1U.

P

89

T.25N..R.1W.

0

90

T.25N..R.1H.

0

RESO

URCE

(S)

Minor

constitu­

ents o

r potential

FORM

TYPE

byproducts In

pa

rent

hese

s

Ag,A

s,Cu

,Zn(

Pb)

Disseminated

Hydrothermal

Cu.M

o(Pb

.Au.

Zn)

Disseminated

Porp

hyry

(Cu.2n.Au)

(Pb.

Sn.A

u)

BRIE

F DESCRIPTION

Dark-red t

o ye

l low, p

y rit

e-

bearin

g go

ssan

In

mafi

c ro

eta-

volcanlc r

ocks

of

unit

Pzv.

No v

isib

le o

re m

inerals

Copper minerals

and molyb­

deni

te d

isse

mina

ted

1n a

lter

edTe

rtia

ry g

ranitic

rock o

f un

itun

it T

bgd

Float

of p

yrlte-bearlng an

d sl

llclfled g

rani

tic

rock

Float

of p

yrlt

e-be

arln

g vein

quar

tz

PRIN

CIPA

L REFERENCES

Miller and

ot

hers

. 19

78(s

ampl

e no.

7SDr

002)

MacK

evet

t an

d Ho

llow

ay.

1977

;Mi

ller

and

othe

rs,

1978

(sample

nos.

75Cy

l57B

, 77Cy01Q,

TM02

4RB.

TM

024R

O,TM

024R

A)

Mill

er a

nd

others,

1978

(sam

ple

no.

TM00

15RB

)

Mill

er a

ndothers,

1978

(sam

ple

nos.

THOOI7RB.

TM0017RC.

TM0017RE)

-H

O> cr o> CO ^x0 o 3 c* 3* C n> 0.

NINES, PROSPECTS. A

ND M

INER

AL O

CCUR

RENC

ES IN T

HE T

ALKEETNA M

OUNTAINS QUA

DRAN

GLE.

ALASKA

(continued)

ro

NAP

NO.

AND

NAHE

(S)

LOCA

TION

CA

TEGO

RY

(if

know

n)

91

T.24

N..R

.2H.

0

92

T.24

N..R

.2W.

0

93

T.23

N..R

.3U.

P

94

T.23N..R.1E.

P

95

T.23

N..R

.1E.

P

96

T.24N..R.1E.

0

97

T.24N..R.2E.

0

96

T.24N..R.2E.

0

99 Mazum

Creek.

T.22

-23N

..R.

9E.

PCa

ribo

u Creek

100

T.23

-24N

..R.

10E.

P

RESO

URCE

(S)

Minor constitu­

ents

or

pote

ntia

l FO

RM

bypr

oduc

ts I

n parentheses

(Cr.

Sb.S

n)

Diss

emin

ated

(Ag.

Sn.Z

n.Au

) Di

ssem

inat

ed

Au

Diss

emin

ated

Cu.Au.Ag

Vein

?*

Au?

Vein

?

Afl.

Cu(A

u)

Cr(N

I.Sb

)

Ag,Cu(Pb,Au)

Au

Diss

emin

ated

Au

Disseminated

TYPE

Porphyry?

Hydr

o the

rmal

?

Hydrothermal?

Volc

anog

enlc

?

Placer

Hydr

othe

rmal

?

Kydrothermal?

...

...

...

Placer

Placer

BRIEF

DESC

RIPT

ION

Altered

granitic r

ock

of u

nit

TKg wi

th mafic m

etavolcanic

xeno

llth

s.

No v

isib

le o

reminerals

Altered metaandeslte o

f unit

Pzv.

No v

isible o

re m

inerals

Placer c

laims, lo

cati

on u

ncer­

tain

Lode

claims

In t

onal

He o

funit T

Kt

.--...

..-.

..Hn

............

Floa

t of

vei

n quartz w

ith

py-

rlte

, chalcopyrUe, a

nd mala­

chite

stai

ns

Several

float

samp

les

of a

lter­

ed m

afic m

etavolcanic

rock

s,po

ssib

ly s

erpe

ntln

lte.

No

visi

ble

ore

mine

rals

Floa

t of mal

achi

te-s

tain

edgr

anit

ic r

ock

Several

placer c

laims

along

Mazuma C

reek

and C

aribou C

reek

In a

lluvium

too

smal

l to s

how

on g

eolo

gic

map

Seve

ral

plac

er c

laim

s along

upper

Little Nel

cMna

Riv

er 1

n

PRINCIPAL

REFE

RENC

ES

Miller a

ndothers.

1978

(sam

ple

no.

74Cy

029A

)

Miller a

ndothers,

1978

(sam

ple

no.

74Cy

030)

U.S. Bu

r. N

ines.

1973

Do

.

. Do

.

Miller a

ndot

hers

. 19

78(s

ampl

e no.

72CyllO)

Miller a

ndot

hers

. 19

78(s

ampl

e no

s.74Cy097A,

74Cy

097C

.74Cy097D)

Mill

er and

othe

rs.

1978

(sample

no.

74Cy096)

Martin a

ndHe

rtle

, 1914.

p.27

9-28

0; U

.S.

Bur.

Mine

s. 1973;

Cobb.

1973.

p. 19

U.S. Bur. M

ines

.19

73

tu cr n> CO o' o =J rt-

i.

3 C n> ex

alluvium t

oo s

mall

to s

how

on

geol

ogic

map

MINLi. PKUSPECIS, ANU

MINE

RAL

OCCU

KKEN

CES

IN T

HE TA

LKEE

TNA

MOUNTAINS

QUADRANGLE,

ALASKA (

continued)

oo

MAP

NO.

AND

NAME

(S)

(If

know

n)

101

Yacko

Cree

k

102

Four

th o

f Ju

ly Cre

ek

103

T.6N

..R.

10U.

104

Dais

y Cr

eek

105

106

107

LOCA

TION

CATEGORY

T.25N..R.11E.

P

T.25-26N..R.12E.

P

T.6N

..R.

10U.

P

T.6N

..R.

10U.

. P

T.25N..R.12E.

T.25N..R.12E.

P

T.4N.,«,)OW.

P

T.3N..R.10W.

P

RESOURCE(S)

Mino

r constitu­

ents or p

oten

tial

FORM

TYPE

bypr

oduc

ts In

parentheses

Au

Disseminated

Placer

Au

Disseminated

Placer

Au

Disseminated

Placer

Au

Disseminated

Placer

Au

Disseminated

Placer

Au

Disseminated

Placer

Au

Disseminated

Placer

BRIE

F DE

SCRI

PTIO

N

Severa

l pl

acer

claims

alon

g Yacko

Creek

1n a

lluv

ium

too

small

to s

how on

geo

logi

c map.

Poss

ibly s

ome

minor

production

Seve

ral

placer c

laim

s along

Four o

f Ju

ly C

reek I

n al

luvi

um

too

smal

l to s

how on

geologic

map

Seve

ral

plac

er claims

In a

llu­

vium

too

sma

ll to

show on

geolog

ic m

ap

Several

placer c

laim

s along

Dais

y Creek

tn a

lluvium

Seve

ral

placer cla

ims

along

uppe

r Daisy

Creek

In a

lluv

ium

too

smal

l to s

how

on g

eologic

map

Seve

ral

placer claims

Placer cla

im alo

ng Old

Man

r ..

*>»!

.

PRIN

CIPA

L RE

FERE

NCES

Chapln,

1918.

p.

64;

U.S.

Bur.

Mine

s. 1

973

Chap

ln.

1918

. p.

64;

Cobb.

1972

U.S.

Bu

r. M

ines

. 1973

Chap

ln.

1918

. p.

64;

Cobb

. 1972;

U.S.

Bur. Mi

nes.

1973

U.S. Bur. M

ines.

1973

Do

.--

Do.

\ o> cr n> CO

0 o 3 c+

_i.3 C n> 0.

MINES. PR

OSPE

CTS,

AND

MINERAL

OCCURRENCES

IN T

HE TALKEETNA

MOUNTAINS

QUADRANGLE.

ALAS

KA (continued)

MAP

NO.

AND

NAME(S)

LOCA

TION

CATEGORY

(If

known)

108

Croo

ked

Creek

T.23N..R.12E.

P

109

Willow C

reek

T.23N..R.12E.

P

110

North

Creek

T.22

-23N

..R.

12E.

P

111

Albert C

reek

T.22

N..R

.11-

12E.

M

112

T.22

N..R

.11E

. 0

RESOURCE(S)

Mino

r co

nsti

tu­

ents o

r potential

FORM

TYPE

byproducts In

parentheses

Au

Diss

emin

ated

Pl

acer

Au

Diss

emin

ated

Placer

Au

Disseminated

Placer

Au(P

t)

Diss

emin

ated

Placer

Zeol

ites

Di

ssem

inat

ed

Dlagenlc a

ndme

tamo

rphl

c

BRIE

F DE

SCRI

PTIO

N

Placer c

laim

s along

lower

Croo

ked

Cree

k

Old

placer cla

im along

Will

ow C

reek

Seve

ral

placer c

laims

along

North

Creek

In a

lluvium

too

smal

l to s

how on

geo

logi

c ma

p

Also

Inc

luded

several

other

claims a

long

Albert

Cree

k In

allu

vium

too

sma

ll to

show

ongeologic m

ap.

Old

Albe

rtCr

eek

plac

er p

rodu

ced

abou

t15

0 02

gold

during 1

914

(Chapln.

191B).

This

Is

the

only p

lacer

deposit

In q

uadr

angl

e with

prov

en,

thou

gh minor,

production

In H

orn

Moun

tain

s an

d Albert

Cree

k region,

extensive

de­

posi

ts o

f mordenlte

and

othe

rVA

/\I 4+AC «i

f nneeiKl* Af

rtnr

tmft

f*

PRINCIPAL

REFERENCES

Chap

ln.

1918.

p. 60

-61

U.S. B

ur.

Mines.

1973;

Chap

ln.

1918.

p. 62

Martin a

ndMe

rtle

. 19

14.

p.278; U

.S.

Bur.

Mine

s, 19

73

Chap

ln.

1918

. p.

S9-6

2; M

arti

n.19

20.

p. 2

3; C

obb*

1972;

U.S. Bur.

Mine

s. 1

973;

Cob

b.1973.

p. 29

Hawklns. 1

976;

MacKevett

and

Holl

oway

. 19

77

H tu cr o> CO ^-^o o 3 <-f

j. rj c n>

o.

1U McOougil C

reek

T.

22N.

.R.1

1E.

AuDi

ssem

inat

ed

Placer

Interest

; lo

cali

zed

In t

uffa

- ce

ous

part o

f Lower Ju

rass

ic

Talkeetn

a Formation.

Similar

deposits

probably oc

cur

else­

wher

e In

Tal

keet

na M

ount

ains

quadrang

le

Seve

ral

placer cla

ims

alon

g McOougal

Creek

In a

lluv

ium

too

smal

l to

sho

w on

geologic

map

U.S.

Bur. M

ines

, 19

73

References Cited

Anderson, R.E., 1969, Preliminary geochemistry and geology, Little Falls Creek area, Talkeetria Mountains quadrangle, Alaska: Alaska Division of Mines and Geology Geochemical Report 19, 16 p.

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.

Capps, S.R., 1919a, Mineral resources of the upper Chulitna region: U.S. Geological Survey Bulletin 692, p. 207-232.

___1919b, Mineral resources of the Western Talkeetna Mountains: U.S. Geological Survey Bulletin 692, p. 187-205.

Capps, S.R., and Short, M.N., 1926, A ruby silver prospect in Alaska: U.S. Geological Survey Bulletin 783, p.89-95

Chapin, Theodore, 1918, The Nelchina-Susitna region, Alaska: U.S. Geological Survey Bulletin 668, 67 p.

Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna Mountains quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-370.

1973, Placer .deposits of Alaska: U.S. Geological Survey Bulletin 1374,213 p.

Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L., 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northerm part of Anchorage quadrangle, and southwest corner of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558A, 60 p., 1 sheet, scale 1:250,000.

Csejtey, Bela, Jr., and Miller, R.J., 1978, Map and table describingmetalliferous and selected nonmetalliferous mineral deposits in the Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-558-B. 1 sheet, 20 p.

Csejtey, Bela, Jr., and Griscom, Andrew, 1978, Preliminary aeromagnetic interpretive map of the Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-558-C, scale 1:250,000, 14 p.

Grantz, Arthur, 1956, Possible orgin of the placer gold deposits of the Nelchina area, Alaska, (Abs.): Geol. Soc. America Bull., v. 67, p.1807.

30

Hawkins, D.B., 1976, Mordenlte deposits and zeolite zonation in the HornMountains area, south-central Alaska: Alaska Division of Geologicaland Geophysical Surveys Special Report 9, 9 p.

MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected nonmetalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Map 77-169A.

Martin, G.C., 1920, The Alaskan mining industry in 1918: U.S. Geological Survey Bulletin 712, p. 11-52.

Martin, G.C., and Mertie, J.B., Or., 1914, Mineral resources of tKe upper Matanuska and Nelchina valleys: U.S. Geological Survey Bulletin 592, p. 273-299.

Menzie, W.D., and Singer, D.A., in press, Some quantitative properties of mineral deposits, in Meyer, R.F., ed., Small Scale Mining of the World New York, McGraw-HTTl.

Miller, R.J., Curtin, G.C., and Csejtey, Bela, Jr., 1978a, Map showinggeochemical distribution and abundance of tin in stream sediments and heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-558-E, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G.C., and Csejtey, Bela, Jr., 1978b, Map showing geochemical distribution and abundance of zinc in stream sediments and heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska U.S. Geol. Survey Open-File Report 78-588-F, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G.C., and Csejtey, Bela, Jr., 1978c, Map showing ' geochemical distribution and abundance of silver, in stream sediments and heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-558-G, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G.C. and Csejtey, Bela, Jr., 1978d, Map showing geochemical distribution and abundance of gold in stream sediments and heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska U.S. Geol. Survey Open-File Report 78-558-H, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G.C., and Csejtey, Bela, Jr., 1978e, Map showinggeochemical distribution and abundance of copper, in stream sediments and heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska U.S. Geol. Survey Open-File Report 78-558-1, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G.C., and Csejtey, Bela, Jr., 1978f, Map showing geochemical distribution and abundance of lead in stream sediments and heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-558-J, 1 sheet, scale 1:250,000.

31

Miller, R.J., Curtin, G.C., and Csejtey, Bela, Jr., 1978g, Map showing geochernical distribution and abundance of molybdenum in stream sediments and heavy mineral concentrates, Talkeetna Mountains quad­ rangle, Alaska: U.S. Geol. Survey Open-File Report 78-558-K, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G. C. and Csejtey, Bela, Jr., 1978h, Map showinggeochemical distribution and abundance of bismuth in stream sediments and heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-558-L, 1 sheet, scale 1:250,000.

Miller, R.J, Curtin, G.C. and Csejtey, Bela, Jr., 1978i, Map showinggeochemical distribution and abundance of chromium in stream sediments and heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-558-M, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G.C., and Csejtey, Bela, Jr., 1978J, Map showing geochemical distribution and abundance of tungsten in heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-588-N, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G.C., and Csejtey, Bela,'Jr., 1978k, Map showing geochemical distribution and abundance of barium in heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-588-0, 1 sheet, scale 1:250,000.

Miller, R.J., Curtin, G.C., and Csejtey, Bela, Jr., 19781, Map showing geochemical distribution and abundance of arsenic in heavy mineral concentrates, Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-588-P, 1 sheet, scale 1:250,000.

Miller, R.J., Cooley, E.F., O'Leary, R.M., Garmezy, Larry, Csejtey, Bela, Jr., Smith, T.E., and Cleveland, M.N., 1978, Analyses of geochemical samples from the Talkeetna Mountains quadrangle, Alaska: U.S. Geol. Survey Open-File Report 78-1052, 279 p.

Reed, B.L., 1978, Disseminated tin occurrence near Coal Creek, Talkeetna Mountains D-6 quadrangle, Alaska: U.S. Geol.Survey Open-File Report 78-77, 8 p.

Richter, D.H., 1963, Geology of the Portage Creek-Susitna River area, Alaska: Alaska Division of Mines and Minerals Geologic Report 3, 2 sheets.

Rose, A.W., 1967, Geology of an area on the upper Talkeetna River, Talkeetna Mountains quadrangle, Alaska: Alaska Division of Mines and Minerals Geologic Report 32, 7 p.

32

Singer, D.A., 1975, Mineral resource models and the Alaskan Mineral Resource Assessment Program: in Vogely, W.A., ed., "Mineral Materials Modeling," Resources for the Future, p. 370-382.

Singer, D.A., and Ovenshine, A.T., 1979, Assessing metallic resources in Alaska: American Scientist, v. 67, no. 5, p. 582-589.

Smith, I.E., Bundtzen, T.K., and Trible, T.C., 1975, Stratabound copper- gold occurrence, northern Talkeetna Mountains, Alaska: Alaska Division of Geological and Geophysical Surveys Miscellaneous Paper 3, 7 p.

U.S. Bureau of Mines, 1973, Alaska 1:250,000 scale quadrangle map overlays showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73.

33