oversight points to an overlooked structural model for cooke mountain, republic gold district, ne...

Oversight Points to anOverlooked Structural Model

for Cooke Mountain,Republic Gold District,

NE Washington

Michael Rasmussen, PhD, CPG

Nine Mile Falls, WA

Calgary

Spokane

●

●

CanadaUS

100 km

CM

Quesnellia

Nelson

Sea Level

Quesnellia

after Hoy and Andrew, 1997Late Triassic

NorthAmerica

Cache Creekmelange

Nicolaarc

Harper Ranch

KootenayBrooklyn

Quesnel TerraneLate Triassic

Southeast British Columbia

Sea Level

Early Jurassic

NorthAmerica

after Hoy and Andrew, 1997

Knob Hill

HallEliseNicola

Cache Creekmelange

Quesnellia

Quesnel TerraneSoutheast British Columbia

Early Jurassic

Jurassic Fold and Thrust Deformation Growth of Metamorphic Core Complexes with Synformal Grabens and Half-Grabens

Box, 1992

Locations Washington-BC.dwg

U D

UD

UD

UD

U D

UD

UD

UD

Volcanics

Intrusives

Greenstone

High Grade Metamorphic

Claim Block(s)

Vancover B.C.

0 100 200 300 400 500

Scale in Miles

Explanation:

Republic

Curlew

Bodi

e Fa

ult

Baco

n Cr

eek

Faul

t

Sher

man

Faul

t

T.40.N

T.39.N

T.38.N

T.37.N

T.36.N

T.40.N

T.39.N

T.38.N

T.37.N

T.36.N

KettleRiver

R.30

E.

R.31

E.

R.32

E.

R.33

E.

R.30

E.

R.31

E.

R.32

E.

R.33

E.

R.34

E.

UD

UD

UD

UD

0 1 2 3 4 5

Scale in Miles

Kettle Mine

K2 Mine & East Veins

Emanuel Creek

Buckhorn Mt

Lamefoot Mine

Overlook Mine

Key East & West Pits

Kettle River Mill Site

Republic District (Golden Eagle)

Geology of the Republic, WA Area

Geology of the Republic, WA Area

G eo lo gy o f th e R ep u b lic G rab en A rea

Toro

da G

rabe

n

Repu

blic

Grab

en

Repu

blic

Grab

en

Lamefoot Mine530,000 oz Au @ 0.21 opt

Key East & West Pits

Kettle River Mill Site

Republic District (Golden Eagle)

Republic

Overlook Mine280,000 oz Au @ 0.15 opt

A -------A’

Sher

man

Fau

lt

Chesaw

Fault

Cooke Mtn

Sericite 197 Ma 40Ar/39Ar

Bedded pyritewith reaction rim.

Pyrite Clasts

Felsic tuffaceous siltite

Felsic tuff

Overlook ProjectGeneralized GeologySection 10210

Tsc-1

Tsc-2

Pcl

PclPcl

OverturnedAngular UnconformityLow-Angle Shear

Pls

Pls

4000 Magnetite

Pyrrhotite

Ore Zone

4200

NW SE

200 Feet

Pvcl

Pvcl

Magnetite

4400

Veinlet Ore Zone

Low-Angle Shear

Po+Mag+Auclasts in limestonebasal conglomerate

LF-xsecs.pptKCA 10-25-96

Evidence for sea-floor deposition of massive mag+po+Au• Metamorphic foliation in massive sulfides• Au-bearing clasts in ls-mag-po conglomerate at ls contact• Zoned decrease in Cu/Cu+Zn from strat base upward• 40Ar/39Ar sericite age 197 Ma in mineralized tuff• S isotope consistent w/ uPermian marine settings • Pb isotopes consistent with Permian Pb, later overprint

~ 250 mc

E.S. Cheney in 1996 at about 26700 N, using data collected up to 11/19/94 by geologists

and consultants of Echo Bay Mines, Ltd.

Lamefoot Isoclinal Fold Model

Oversight

Overlook

Key WestKey East

Adamera Drilling 2014, Oversight Prospect, 50 m depth

Downhole

Section is upright.

Oversight

Cooke Mountain OverlookCooke Mountain

Oversight

Cooke Mountain

Mark Kolebaba, Pres/CEO, Adamera Minerals, Oversight Prospect, Cooke Mtn,

Republic District, Washington