oversight points to an overlooked structural model for cooke mountain, republic gold district, ne...
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![Page 1: Oversight Points to an Overlooked Structural Model for Cooke Mountain, Republic Gold District, NE Washington Michael Rasmussen, PhD, CPG Nine Mile Falls,](https://reader036.vdocuments.net/reader036/viewer/2022062500/5697c00a1a28abf838cc7ecc/html5/thumbnails/1.jpg)
Oversight Points to anOverlooked Structural Model
for Cooke Mountain,Republic Gold District,
NE Washington
Michael Rasmussen, PhD, CPG
Nine Mile Falls, WA
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Calgary
Spokane
●
●
CanadaUS
100 km
CM
Quesnellia
Nelson
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Sea Level
Quesnellia
after Hoy and Andrew, 1997Late Triassic
NorthAmerica
Cache Creekmelange
Nicolaarc
Harper Ranch
KootenayBrooklyn
Quesnel TerraneLate Triassic
Southeast British Columbia
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Sea Level
Early Jurassic
NorthAmerica
after Hoy and Andrew, 1997
Knob Hill
HallEliseNicola
Cache Creekmelange
Quesnellia
Quesnel TerraneSoutheast British Columbia
Early Jurassic
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Jurassic Fold and Thrust Deformation Growth of Metamorphic Core Complexes with Synformal Grabens and Half-Grabens
Box, 1992
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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
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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
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Chesaw
Fault
Cooke Mtn
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Sericite 197 Ma 40Ar/39Ar
Bedded pyritewith reaction rim.
Pyrite Clasts
Felsic tuffaceous siltite
Felsic tuff
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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
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~ 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
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Oversight
Overlook
Key WestKey East
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Adamera Drilling 2014, Oversight Prospect, 50 m depth
Downhole
Section is upright.
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Oversight
Cooke Mountain OverlookCooke Mountain
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Oversight
Cooke Mountain
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Mark Kolebaba, Pres/CEO, Adamera Minerals, Oversight Prospect, Cooke Mtn,
Republic District, Washington