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Overlook Mine, Cooke Mountain, Belcher Mining District, Ferry Co., Washington, USAi
Regional Level Types
Overlook MineMine
Cooke MountainMountain
Belcher Mining DistrictMining District
Ferry Co.County
WashingtonState
USACountry

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Key
Latitude & Longitude (WGS84):
48° 41' 56'' North , 118° 34' 7'' West
Latitude & Longitude (decimal):
Owned/operated by:
Locality type:
Nearest Settlements:
PlacePopulationDistance
Republic1,072 (2017)13.6km
Curlew118 (2011)20.9km
Orient115 (2011)32.6km
Grand Forks4,208 (2008)38.4km


Tectonics: Eocene Felsic Rocks Intruded Permian-Triassic Metasedimentary And Metavolcanic Rocks Of The Republic Graben (Muessig, 1967, Geol. Map).

Development: Econ.com: the first gold-silver dore was poured (1990) from the jointly operated overlook and kettle mines. Anticipated production for the first year is 110,000 oz.; the majority will be from the overlook deposit (joseph, 1990, p. 20).

Geology: The overlook deposit is in permian-triassic limestone, dolomitic limestone, argillite, and graywacke. The ore bodies lie next to a network of dikes, sills, and intrusive bodies of the scatter creek rhyodacite (muessig, 1967, p. 113)

Regions containing this locality

North America PlateTectonic Plate
Rocky Mountains, North AmericaMountain Range

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


12 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Can Mineral February 1998 v. 36 no. 1 p. 147-162 ; Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.
Chalcopyrite
Formula: CuFeS2
Reference: Metal Mines of Washington-Preliminary Report; Derkey, Joseph, Lasmanis; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Chlorite Group'
Reference: Metal Mines of Washington-Preliminary Report; Derkey, Joseph, Lasmanis; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Fayalite
Formula: Fe2+2SiO4
Reference: Can Mineral February 1998 v. 36 no. 1 p. 147-162 ; Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.
'Fayalite-Forsterite Series'
Reference: Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.
Gold
Formula: Au
Reference: Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.
Greenalite
Formula: (Fe2+,Fe3+)2-3Si2O5(OH)4
Reference: Can Mineral February 1998 v. 36 no. 1 p. 147-162 ; Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Metal Mines of Washington-Preliminary Report; Derkey, Joseph, Lasmanis; Can Mineral February 1998 v. 36 no. 1 p. 147-162 ; Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Minnesotaite
Formula: Fe2+3Si4O10(OH)2
Reference: Can Mineral February 1998 v. 36 no. 1 p. 147-162 ; Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Metal Mines of Washington-Preliminary Report; Derkey, Joseph, Lasmanis
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Metal Mines of Washington-Preliminary Report; Derkey, Joseph, Lasmanis; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrite
Formula: FeS2
Reference: Metal Mines of Washington-Preliminary Report; Derkey, Joseph, Lasmanis; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrrhotite
Formula: Fe7S8
Reference: Metal Mines of Washington-Preliminary Report; Derkey, Joseph, Lasmanis; Can Mineral February 1998 v. 36 no. 1 p. 147-162 ; Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Reference: Can Mineral February 1998 v. 36 no. 1 p. 147-162 ; Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.
Talc
Formula: Mg3Si4O10(OH)2
Reference: Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Fayalite9.AC.05Fe2+2SiO4
Greenalite9.ED.15(Fe2+,Fe3+)2-3Si2O5(OH)4
Minnesotaite9.EC.05Fe2+3Si4O10(OH)2
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Talc9.EC.05Mg3Si4O10(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Fayalite-Forsterite Series'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Fayalite51.3.1.1Fe2+2SiO4
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Greenalite71.1.2b.4(Fe2+,Fe3+)2-3Si2O5(OH)4
Sheets of 6-membered rings with 2:1 layers
Minnesotaite71.2.1.5Fe2+3Si4O10(OH)2
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Talc71.2.1.3Mg3Si4O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Fayalite-Forsterite Series'-
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H MinnesotaiteFe32+Si4O10(OH)2
H Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4
H MuscoviteKAl2(AlSi3O10)(OH)2
H TalcMg3Si4O10(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
CCarbon
C CalciteCaCO3
OOxygen
O MagnetiteFe2+Fe23+O4
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O MinnesotaiteFe32+Si4O10(OH)2
O FayaliteFe22+SiO4
O Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4
O QuartzSiO2
O CalciteCaCO3
O MuscoviteKAl2(AlSi3O10)(OH)2
O TalcMg3Si4O10(OH)2
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
MgMagnesium
Mg TalcMg3Si4O10(OH)2
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MinnesotaiteFe32+Si4O10(OH)2
Si FayaliteFe22+SiO4
Si Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4
Si QuartzSiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si TalcMg3Si4O10(OH)2
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SSulfur
S PyriteFeS2
S PyrrhotiteFe7S8
S ChalcopyriteCuFeS2
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe MagnetiteFe2+Fe23+O4
Fe ChalcopyriteCuFeS2
Fe MinnesotaiteFe32+Si4O10(OH)2
Fe FayaliteFe22+SiO4
Fe Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AuGold
Au GoldAu

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Bancroft, Howland, (1914), the Ore Deposits of Northeastern Washington: U.S.G.S. Bulletin 550, 215 P.
Shedd, Solon; Jenkins,o.P.;cooper,h.H., (1922), Iron Ores, Fuels, and Fluxes of Washington: Washington Division of Geology Bulletin 27, 160 P., 1 Pl.
Glover, S.L., (1942), Washington Iron Ores, a Summary Report: Washington Division of Mines and Mining Report of Investigations 2., 23 P.
Huntting, M.T., (1956),inventory of Washington Minerals-part Ii, Metallic Minerals: Washington Division of Mines and Geology Bulletin 37, V. 1, 428 P.; V. 2. 67p.
Muessig, Siegfried, (1967), Geology of the Republic Quad. and Part of the Aeneas Quad., Ferry County, Washington: U.S.G.S. Bulletin 1216, 135 P., 1 Pl.
Tschauder, R.J., (1989), Gold Deposits in Northern Ferry County, Washington. in Joseph N.L. and Others; Editors, Geologic Guidebook for Washington and Adjacent Areas: Washington Division of Geology and Earth Resources Information Circular 86, P. 241-253.
Joseph, N.L., (1990), Mineral Industry News Notes:washington Geologic Newsletter, V. 18, No. 2, P. 19-20.
Rasmussen, M. G., Evans, B. W., & Kuehner, S. M. (1998). Low-temperature fayalite, greenalite, and minnesotaite from the Overlook gold deposit, Washington; phase relations in the system FeO-SiO 2-H 2 O. The Canadian Mineralogist, 36(1), 147-162.

USGS MRDS Record:10055890
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