Transcript
Page 1: Geologic Map of the Chandalar Mining District, Brooks Range, … · 2019-04-21 · Map Symbols Approximate cirque headwall; hatched lines show approximate upper limit of cirque basin;

Map Symbols

Approximate cirque headwall; hatched lines show approximate upper limit of cirque basin; (not a deposit)

15

22

125

28

40

80

MI C

IMC

IMC

E

Geologic Units

Qa – Holocene alluvium

Upper Plate Units

Bx – Undifferentiated bedrock

Qgt1 – Glacial till and outwash of Sagavernirktok or possibly older glaciation

Qgt2 – Glacial till and outwash of Itkillik I glaciation

Qgt3 – Glacial till and outwash of Itkillik II glaciation

Qgt4 – Late Wisconsin to Holocene glacial till

Qrg – Rock glacier deposits

Ql – Lacustrine (Lake) deposits

Qsl – Solofluction lobe deposits

Qca – Colluvial and alluvial deposits, undifferentiated

Qct – Colluvium and talus deposits

Qat – Alluvial terrace deposits

Qht – Placer mine tailings

Qaf – Alluvial fan deposit

Dlf – Light gray, tan weathered, K-spar-rich, felsic meta-igneous schist; possibly metamorphosed felsic tuff

Dup – Gray, fine to medium grained, carbonaceous, fissile, platey phyllite

Lower Plate Units

Dlq – Mica quartzose schist; locally quartzite

Dlc – Chlorite-rich, albite bearing, calcareous, tuffaceous schist

Dlb – Dark gray to black, finely laminated, fine grained, quartz-mica, meta-mudstone schist

UNCONSOLIDATED DEPOSITS

BEDROCK DEPOSITS

Mz Pzg – Meta-igneous greenstone

Mz Pza – Mafic meta-volcanic agglomerate and flows

Dum – Quartz chlorite, muscovite schist; includes meta-turbitite schist section as observed in unit Dut

Dut – Coarse to fine grained, rhythmically layered, meta-turbidite schist and phyllite

Dul – Light gray, rounded, locally massive, calcareous meta-sandstone and quartz-mica schist

Dus – Quartz rich, blocky, muscovite-schist in eastern portion of map areaQcl – Colluvial landslide block

Mines and prospects

Mz Pzg – Meta-igneous greenstone

LM

CIMC

P

IMC

Strike and dip of foliation

Plunge and axis of isoclinal fold (f1), mineral lineation (ML), crenulation (C), or pencil structure (P)

Direction and plunge of overturned syncline

High angle fault; Arrows show direction of movement; U=upthrown side D=downthrown side; Headed arrowshows direction of dip with dip angle where available.

Thrust fault; teeth are directed into upper plate

Lateral and Terminal limit of glaciation; (not a deposit)

Ice marginal meltwater channel showing direction of flow

Strike and dip of cleavage

Strike and dip of joints

Location of glacial erratic

Direction and plunge of syncline

80

N

M

28.5°

Geologic Map of the Chandalar Mining

District, Brooks Range, Northern Alaska

by Thomas K. Bundtzen and Gregory M. Laird

Prepared for Little Squaw Gold Mining Company

Pacific Rim Geological Consulting, Inc., Fairbanks, Alaska

Sheet 1

SCALE 1:20,000DATUM MEAN SEA LEVEL CONTOUR INTERVAL 100 FEET

MILES

KILOMETERS

0 1 2 3 4

0 1 2 3 4 5 6

TOPOGRAPHIC BASE FROM THE USGS CHANDALAR C-3 1:63,360 SCALE QUADRANGLE

QaQa

QaQa

QaQa

QhtQht QaQa

QhtQht QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QhtQht

aQaQ

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QhtQht

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QhtQht

QhtQht

QaQa

QaQa

QhtQht

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

QaQa

BxBx

BxBx

BxBx

Qgt3?Qgt3?

Qgt3Qgt3

Qgt2Qgt2

Qgt2Qgt2

Qgt2Qgt2

QctQct

QctQct

QctQct

Qgt2Qgt2

Qgt2Qgt2

Qgt2Qgt2

DusDus

Mz PzgMz Pzg

DlbDlb

DlbDlb

DlbDlb

DlbDlb

Mz PzgMz Pzg

Mz PzgMz Pzg

Qgt3?Qgt3?

Qgt3Qgt3

Qgt3Qgt3Qgt3Qgt3

Qgt3Qgt3

DusDus

DusDus

DusDus

DusDus

DusDus

DusDus

DusDus

DlbDlb

QafQaf

QctQct

QafQafQctQct

Qgt3?Qgt3?Qgt3?Qgt3?

QctQct

QatQat

QatQatQatQat

QafQaf

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DusDus DusDus

DusDus

QafQaf

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QctQctDlbDlb

DlbDlb

DlbDlb

DlbDlb

DlbDlb

DlbDlbDlbDlbMz PzgMz Pzg

Mz PzgMz Pzg

Mz PzgMz Pzg

Qgt1?Qgt1?

Dum?Dum?

Qgt3Qgt3QctQct

DumDum

QafQaf

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QctQct Qgt3Qgt3

Qgt3Qgt3

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DumDum

DupDup

DutDut

DutDut

QhtQht

QhtQht

QhtQht

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QatQat

Qgt3Qgt3

Qgt2Qgt2

Qgt2Qgt2

QatQat

QatQat

QatQat

Qgt3Qgt3

Qgt3Qgt3

Qgt3Qgt3 Qgt3Qgt3

Qgt3Qgt3

Qgt3Qgt3

BxBx

Qgt3Qgt3Qgt3Qgt3

Qgt3Qgt3

QatQat

QatQat

QafQaf

QclQclQafQaf

QafQaf

Qgt2Qgt2

Qgt2Qgt2

Qgt2Qgt2

QatQat

QatQat

Qgt1Qgt1

QctQct

DlbDlbDlbDlb

DlbDlb

DlbDlb

DlbDlb

Mz PzgMz Pzg

Mz Pzg Mz Pzg

Mz PzgMz Pzg

DlfDlf

DlcDlc

DlcDlcDlcDlc

DlbDlb

QctQct

DlfDlf

Mz PzgMz PzgMz PzgMz Pzg

Mz zg PMz zg PDlqDlq

QslQsl

QslQsl

DutDut

DutDut

Dlu

Dlu

Mz P

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QctQct

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cQ

tcQ

t

DlbDlb

DlbDlbQctQct

DutDut

DutDut

DutDut

Dlc

Dlc

DlqDlq Mz PzgMz Pzg

DutDut

DutDut

DutDut

DutDut

DulDul

DumDum

DulDul

DumDumDumDum

DumDum

DulDul

QctQct

QctQct

QctQct

QctQct

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Qgt

3Q

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Qgt3Qgt3

Qgt3Qgt3

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DutDut

DutDut

DupDup

DupDup

QrgQrg

QclQclQctQct

DulDul

DutDut

DumDum

DumDum

DumDum

DumDumD

umD

um

DupDupDupDup

DupDupDupDup

DusDus

QatQat

QcaQca

QcaQca

QcaQca

QcaQca

QcaQca

QcaQca

Qaf

Qaf

QctQct

QctQct

DumDum

DlbDlbQatQat

Mz PzgMz Pzg

QhtQht

QhtQht

DutDutDupDup

QctQct

Qgt3Qgt3

QctQct QctQct

Qgt3Qgt3

gQ

t3gQ

t3

Qgt2Qgt2QctQct

QlQl

QlQl

QlQlQgt3Qgt3

Qgt3Qgt3

Qgt3Qgt3QlQl

QlQl

QlQl

Qgt3Qgt3

Qgt3Qgt3

QafQaf

Qgt2Qgt2

QafQaf

QafQaf

QafQaf

QafQaf

QafQaf

QafQaf

QafQaf

Qgt2Qgt2

Qgt2Qgt2

Qgt3Qgt3Qgt3Qgt3

Mz PzgMz Pzg

Mz PzgMz Pzg

QctQct

Qgt1Qgt1

DlbDlb

Qgt1Qgt1

Qgt1Qgt1

Qgt1Qgt1

DlbDlb

DlbDlb

DutDut

DumDum

DumDum

Qgt4Qgt4

Qgt3Qgt3QctQct

Qgt2Qgt2

Qgt2Qgt2

Qgt2Qgt2

Qgt3Qgt3

QctQct

QctQct

Qgt3Qgt3

DumDum

DumDum

DumDum

DumDum

DumDum

DulDul

DulDul

DulDul

DulDul

DutDut

DutDut

tDutDu

ulDulD

DulDul

DulDul

DulDul

DupDup

uDpuDp

DupDup

Qgt3?Qgt3?

Qgt3?Qgt3?

DumDum

DumDum

DumDum

DumDumDumDum

DumDum

Mz PzgMz PzgDlbDlb

DlbDlb

QcaQca

DlbDlb

QcaQca

QcaQca

QcaQca

QafQaf

Mz PzgMz Pzg

QcaQca

QcaQca

QcaQca

QcaQca

DlbDlb

DlbDlb

DlbDlb

DumDum

DupDup

DlbDlb

DlbDlb

Qgt1Qgt1

QctQct

DutDut

DlbDlb

DlbDlb

Qgt1Qgt1

Qgt1Qgt1

Qgt1Qgt1

Qgt1Qgt1

Qgt2Qgt2

Qgt2Qgt2 Qct

Qct

DulDul

DlbDlb

DlbDlb

Qgt1Qgt1

DumDumDumDum

DumDum

DumDum

QctQct

QctQct

Qgt1Qgt1

QrgQrg

DlbDlb

Mz PzaMz Pza

Qgt1Qgt1

Qgt3Qgt3

Qgt2Qgt2

DlbDlb

DlbDlb

Qgt1Qgt1

DlbDlb

DlbDlb

DlbDlb

QctQct

QctQct

Qgt2Qgt2

Qgt2Qgt2

DlqDlq

QlQl

QaQa

DumDum

QaQa

QlQl

Qgt2Qgt2Qgt1?Qgt1?

QctQct

QctQct

QcaQca

QcaQca

QlQl

Qgt2Qgt2

DlbDlb

DlqDlq

DlbDlb

DlbDlb

Qgt2Qgt2

QaQa

QaQaQlQl

Qgt2Qgt2

QlQl

DlbDlb

Qgt2Qgt2

QlQl

DlbDlb

DlbDlb

Mz PzaMz Pza

Mz PzaMz Pza

QlQl

QlQl

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DlbDlbMz PzaMz Pza

Mz

z P

aM

zz

Pa

QaQa

Qgt2Qgt2

QcaQca

QcaQca

Qgt2Qgt2

Dlb?Dlb?

QaQa

QaQa

Qgt3Qgt3

Mz PzaMz Pza

DlbDlb

DlbDlb

Qgt1

Qgt1

Qgt2Qgt2

Qgt2Qgt2

Qgt1Qgt1

QaQa

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Qa

Qa

Qa

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Qht Qa

Qa

Qa

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Qa

Qa

Qa

Qa

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Qa

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Qa

Qa

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Qa

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Qa

Qa

Qa

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Qa

Qa

Qa

Qa

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Qht

Qa

Qa

Qht

Qa

Qa

Qa

Qa

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Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Qa

Bx

Bx

Bx

Qgt3?

Qgt3

Qgt2

Qgt2

Qgt2

Qct

Qct

Qct

Qgt2

Qgt2

Qgt2

Dus

Mz Pzg

Dlb

Dlb

Dlb

Dlb

Mz Pzg

Mz Pzg

Qgt3?

Qgt3

Qgt3Qgt3

Qgt3

Dus

Dus

Dus

Dus

Dus

Dus

Dus

Dlb

Qaf

Qct

QafQct

Qgt3?Qgt3?

Qct

Qat

QatQat

Qaf

Qaf

Qaf

Qaf

Qct

Qct

Qct

Dus Dus

Dus

Qaf

Qaf

Qct

QctDlb

Dlb

Dlb

Dlb

Dlb

DlbDlbMz Pzg

Mz Pzg

Mz Pzg

Qgt1?

Dum?

Qgt3Qct

Dum

Qaf

Qaf

Qct

Qct

Dus

Qct Qgt3

Qgt3

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Dup

Dut

Dut

Qht

Qht

Qht

Qgt2

Qat

Qgt3

Qgt2

Qgt2

Qat

Qat

Qat

Qgt3

Qgt3

Qgt3 Qgt3

Qgt3

Qgt3

Bx

Qgt3Qgt3

Qgt3

Qat

Qat

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QclQaf

Qaf

Qgt2

Qgt2

Qgt2

Qat

Qat

Qgt1

Qct

DlbDlb

Dlb

Dlb

Dlb

Mz Pzg

Mz Pzg

Mz Pzg

Dlf

Dlc

DlcDlc

Dlb

Qct

Dlf

Mz PzgMz Pzg

Mz zg PDlq

Qsl

Qsl

Dut

Dut

Dlu

Mz P

zg

Qct

Qct

cQ

t

Dlb

DlbQct

Dut

Dut

Dut

Dlc

Dlq Mz Pzg

Dut

Dut

Dut

Dut

Dul

Dum

Dul

DumDum

Dum

Dul

Qct

Qct

Qct

Qct

Qgt3

Qgt

3

Qgt3

Qgt3

Qct

Dut

Dut

Dup

Dup

Qrg

QclQct

Dul

Dut

Dum

Dum

Dum

DumD

um

DupDup

DupDup

Dus

Qat

Qca

Qca

Qca

Qca

Qca

Qca

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Qct

Dum

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Mz Pzg

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Qht

DutDup

Qct

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Qct Qct

Qgt3

gQ

t3

Qgt2Qct

Ql

Ql

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Qgt3

Qgt3Ql

Ql

Ql

Qgt3

Qgt3

Qaf

Qgt2

Qaf

Qaf

Qaf

Qaf

Qaf

Qaf

Qaf

Qgt2

Qgt2

Qgt3Qgt3

Mz Pzg

Mz Pzg

Qct

Qgt1

Dlb

Qgt1

Qgt1

Qgt1

Dlb

Dlb

Dut

Dum

Dum

Qgt4

Qgt3Qct

Qgt2

Qgt2

Qgt2

Qgt3

Qct

Qct

Qgt3

Dum

Dum

Dum

Dum

Dum

Dul

Dul

Dul

Dul

Dut

Dut

tDu

ulD

Dul

Dul

Dul

Dup

uDp

Dup

Qgt3?

Qgt3?

Dum

Dum

Dum

DumDum

Dum

Mz PzgDlb

Dlb

Qca

Dlb

Qca

Qca

Qca

Qaf

Mz Pzg

Qca

Qca

Qca

Qca

Dlb

Dlb

Dlb

Dum

Dup

Dlb

Dlb

Qgt1

Qct

Dut

Dlb

Dlb

Qgt1

Qgt1

Qgt1

Qgt1

Qgt2

Qgt2 Qct

Dul

Dlb

Dlb

Qgt1

DumDum

Dum

Dum

Qct

Qct

Qgt1

Qrg

Dlb

Mz Pza

Qgt1

Qgt3

Qgt2

Dlb

Dlb

Qgt1

Dlb

Dlb

Dlb

Qct

Qct

Qgt2

Qgt2

Dlq

Ql

Qa

Dum

Qa

Ql

Qgt2Qgt1?

Qct

Qct

Qca

Qca

Ql

Qgt2

Dlb

Dlq

Dlb

Dlb

Qgt2

Qa

QaQl

Qgt2

Ql

Dlb

Qgt2

Ql

Dlb

Dlb

Mz Pza

Mz Pza

Ql

Ql

Qgt2

DlbMz Pza

Mz

z P

a

Qa

Qgt2

Qca

Qca

Qgt2

Dlb?

Qa

Qa

Qgt3

Mz Pza

Dlb

Dlb

Qgt1

Qgt2

Qgt2

Qgt1

Qa

Qht

Dlu

Dlu

Dlu

zgMz PzgMz PzgMz P

Dlu

Dlu

Dlu

DulDulDul

zgMz PzgMz PzgMz PQctQctQct

DulDulDul

DumDumDum

DlfDlfDlf

Pir

onee

E

E

E

E

E

E

Big QuartzVeinsBig QuartzVeinsBig QuartzVeins

BoulderCreek VeinsBoulderCreek VeinsBoulderCreek Veins

Tobin CreekPlacerDeposit

Tobin CreekPlacerDeposit

Tobin CreekPlacerDeposit

TobinCreekMill

TobinCreekMill

TobinCreekMill

Woo

dchuck

Cre

ek

Woo

dchuck

Cre

ek

Woo

dchuck

Cre

ek

Wod

chuc

k

oW

odch

uck

oW

odch

uck

o

Faul

tFa

ult

Faul

t

McNettProspectMcNettProspectMcNettProspect

Fu t

al

Fu t

al

Fu t

al

Interpreted Extension Little Squaw Fault

Interpreted Extension Little Squaw Fault

Interpreted Extension Little Squaw Fault

Kelty ProspectKelty ProspectKelty Prospect

MercuryProspectMercuryProspectMercuryProspect

CaribouGulch

Prospect

CaribouGulch

Prospect

CaribouGulch

Prospect CaribouGulchSouth

CaribouGulchSouth

CaribouGulchSouth

CaribouGulch

CaribouGulch

CaribouGulch

MikadoGold MineMikadoGold MineMikadoGold Mine

ulFa

tulFa

tulFa

t

Mki ado

Mki ado

Mki ado

Big CreekPlacer

Deposit

Big CreekPlacer

Deposit

Big CreekPlacer

Deposit

St. Mary’sCreek

St. Mary’sCreek

St. Mary’sCreek

Kiska/TonopahKiska/

TonopahKiska/

Tonopah

???

Summit

Summit

Summit

FaultFaultFault

Ss e

yt m

Ss e

yt m

Ss e

yt m

Big CreekBowlBig CreekBowlBig CreekBowl

RatchetRidge

Prospect

RatchetRidge

Prospect

RatchetRidge

Prospect

SummitGoldMine

SummitGoldMine

SummitGoldMine

EneveloeGold MineEneveloe

Gold MineEneveloe

Gold Mine

SummitGulchSummitGulchSummitGulch

Robbin’sGulch

Robbin’sGulch

Robbin’sGulch

LittleSquaw

Gold Mine

LittleSquaw

Gold Mine

LittleSquaw

Gold Mine

Gold GulchGold GulchGold Gulch East ProspectorEast ProspectorEast Prospector

GrubstakeGrubstakeGrubstake

MelloBenchPlacerDeposit

MelloBenchPlacerDeposit

MelloBenchPlacerDeposit

SpringSpring

eC

reke

Cre

k

Spring

eC

rek

PioneerProspectPioneerProspectPioneerProspect

PioneerPioneerPioneer

FaultFaultFault

CrystalProspectCrystalProspectCrystalProspect

UranusUranusUranus

Aurora/UranusGulch

Aurora/UranusGulch

Aurora/UranusGulch

NuggetCreekNuggetCreekNuggetCreek

NorthStar Vein

NorthStar Vein

NorthStar Vein

PallasgrenProspectPallasgrenProspectPallasgrenProspect

DrumlummonDrumlummonDrumlummon

PedroGulchPedroGulchPedroGulch

Interpreted

Interpreted

Interpreted

Ee

n

xt nsio

Ee

n

xt nsio

Ee

n

xt nsio

Mikado

Mikado

Mikado

FaultFaultFault

n

Extension

Extension

ExtensioM

cell

anL

Mc

ellan

LM

cell

anL

Creek

Creek

Creek

ault

Fault

Fault

F

???

???

???

McL

lael

n

McL

lael

n

McL

lael

n

Creek

Creek

Creek

FaultFaultFault

p

e s n

Inter reted Ext n io

p

e s n

Inter reted Ext n io

p

e s n

Inter reted Ext n io

Pi nee F u

or

a lt

Pi nee F u

or

a lt

Pi nee F u

or

a lt

ML

lc

e lan

ML

lc

e lan

ML

lc

e lan

Creek

Creek

Creek

aul

F

tau

lF

tau

lF

t

Litlt e

Litlt e

Litlt e

??????

???

???

???

Little

Little

Little

qw

S uaqw

S uaqw

S ua

tFaultFaultFaul

Intp

eted

err

Intp

eted

err

Intp

eted

err

xteni

n

E

s o

xteni

n

E

s o

xteni

n

E

s o

kao

Mi

dka

o

Mi

dka

o

Mi

dFault

Fault

FaultZoneZoneZone

EE

E

E

E

E

DD

UUUU

DD

D

UU

D

Geologic mapping by T.K. Bundtzen and G.M. Laird, June 28-July 19 and September 3-5, 2006

Grubstake EastGrubstake EastGrubstake East

TonopahDepositTonopahDepositTonopahDeposit

Sm

i

um

t

Sm

i

um

t

Sm

i

um

t

FaultFaultFault

Ss e

yt m

Ss e

yt m

Ss e

yt m

MikadoDeposit-Northwest

MikadoDeposit-Northwest

MikadoDeposit–Northwest

C’C’

CC

B’B’

BBAA

A’A’

C’

C

B’

BA

A’

Qgt4Qgt4

Qgt3Qgt3

Qgt2Qgt2

Qgt1Qgt1

QaQa QhtQhtQafQaf QctQct

QatQat QcaQca

QclQcl QlQl QrgQrg

Mz

Pzg

Mz

Pzg

Mz

Pzg

Mz

Pzg

Mz

Pza

Mz

Pza

DlbDlb DlqDlq DlfDlf DlcDlcDusDus DulDul DumDum DutDut DupDup

Qgt4

Qgt3

Qgt2

Qgt1

Qa QhtQaf Qct

Qat Qca

Qcl Ql Qrg

Mz

Pzg

Mz

Pzg

Mz

Pza

Dlb Dlq Dlf DlcDus Dul Dum Dut Dup

ut

rr

Qa

ena

y Holocene

Wisconsin

Pre-Wisconsin

oD

evn

ian

to

T?

ri

assi

c o

D

evni

an?

Correlation of Map Units

Digital Cartography by Kelly Digital Design, 2006/2007

3380’

2400’

Dlb

Mz Pzg

DlbDum

Pioneer Fault

DutDut

Dul

DulDum

McNett-EneveloeVein Fault System

DumDul

Dut

Dut

Mikado Vein Fault Zone

Dup

bD

l

Dum

Dlb

McNett Peak5549’

Dum

DlbDlb

Mz Pzg

Dlb

5000’

3000’

1000’

5000’

3000’

1000’

A’A

Extension of Little SquawFault Zone

Dut

B B’

Dlb

Mz Pzg DlbDul

Dum

Dlb

Dlb

Dum

Dum

Dul

Dlb Dlb

Dum

Dup

Dum

Mz Pzg

Dlb

Dlb

Pioneer (Vein) Fault

UranusShearHead of Little

Squaw Creek

Ratchet Ridge

Summit Vein FaultKiska Vein Fault

lD

b

Dum

Mikado Fault Zone

5000’

3000’

1000’

5000’

3000’

1000’Dlb

Little Squaw/Crystal Fault Zone

Dum?

tDu

uDp

tDu

Dul

Dut

Dlbc

Dl

Dum

Dum

Dul

Dut

Mz

z P

g

tDu

zz

M P

g

Dut

Dlu

tDu

DlbMz Pzg

DlcDlf

Dlc

Interpreted Extensionof Mikado Fault Zone Interpreted Extension

of Pioneer Fault

DusDlbDusDusDusDusDlb

4000’

3000’

1000’

4000’

3000’

1000’

C’C

Location ofMap Area

272727

252525

333

363636

262626

202020

222222

282828

262626

222222

181818

353535

222222

757575

303030

808080

808080

148° 00’

67° 30’148° 20’

67° 35’

440000m

445000m

450000m 455000m

7500000m

7495000m

7490000m

440000m

445000m 450000m

455000m

7500000m

7495000m

7490000m

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