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Fox Gulch (Fox Gulch Platinum placer), Salmon River - Red Mountain District, Goodnews Bay, Bethel Census Area, Alaska, USAi
Regional Level Types
Fox Gulch (Fox Gulch Platinum placer)Gulch
Salmon River - Red Mountain DistrictMining District
Goodnews BayBay
Bethel Census AreaCensus Area
AlaskaState
USACountry

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Key
Latitude & Longitude (WGS84):
59° 4' 54'' North , 161° 42' 50'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Goodnews Bay256 (2017)8.3km


Geologic Description = Fox Gulch is where platinum was first discovered in the Salmon River area (1926). It has been placer mined for about 0.4 mile upstream from its junction with Platinum Creek. The headwaters of Fox Gulch are in dunite of the Red Mountain ultramafic pluton, and it also flows across border zone clinopyroxenite and hornblende-bearing rocks. In the area of mining, however, the bedrock is part of an assemblage that includes sheared argillite, graywacke, and mafic to intermediate, fine-grained igneous rocks that are difficult to identify because of their decomposed character where exposed in mining cuts (Mertie, 1940). These strata are included in a regional sedimentary and volcanic assemblage that ranges in age from Paleozoic to Mesozoic (Hoare and Coonrad, 1978). Gravels in lower Fox Gulch are up to 12 feet thick, but they thin upstream.The gravels are coarse, subangular, and locally derived and contain boulders averaging 8 to 12 inches in diameter. The average width of the paystreak was 75 feet and it extended at least 2,600 feet upstream from the mouth of Fox Gulch. Platinum was concentrated in the lower few feet of gravel, on bedrock, and in fractures in bedrock. Chromite is common in the heavy-mineral concentrates and some chromite grains are intergrown with PGM. The U. S. Bureau of Mines collected 4 samples from the present drainage. These samples contained 0.0009 to 0.0378 ounce of PGM per cubic yard (Fechner, 1988, p. 80) The highest grade sample was from unmined material in the upper part of the gulch. One sample of tailings in Fox Gulch contained 0.0121 ounce of PGM per cubic yard (Fechner, 1988). Microprobe analyses of PGM grains from these samples showed 1.3 to 1.9 percent Rh, 0.7 to 1.0 percent Ru, 37.7 to 48.6 percent Pt, 26.7 to 41.3 percent Ir, 9.8 to 13.4 percent Os, and 4.1 to 8.4 percent Fe. PGM-bearing phases that were identified in these samples included iron-platinum alloy containing 8 to 30 percent Fe; iron-platinum alloy with minor osmiridium inclusions; and hollingsworthite, irarsite, iridarsenite, iridium, sperrylite, and platarsite (Fechner, 1988, p. 80). The mean of 26 analyses of PGMs (recalculated to exclude impurities) recovered during mining from Fox Gulch and Platinum Creek above Squirrel Creek was 63.71% Pt, 28.01% Ir, 5.39% Os, 0.47% Ru, 1.82% Rh, 0.23% Pd, and 0.37% Au. Six samples from Fox Gulch, recalculated free of impurities, averaged 50.56 percent Pt, 39.14 percent Ir, 7.74 percent Os, 0.71 percent Ru, 1.62 percent Rh, 0.14 percent Pd, and 0.09 percent Au (Mertie, 1976). Fechner (1988) estimates that there are 160,000 cubic yards of tailings on Fox Gulch that contain 0.012 ounce of PGM per cubic yard and 20,000 cubic yards of unmined material that contain 0.02 ounce of PGM per cubic yard.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


28 valid minerals. 2 (TL) - type locality of valid minerals.

Detailed Mineral List:

Chromite
Formula: Fe2+Cr3+2O4
Reference: US Geological Survey, 2005, Alaska Resource Data File (ARDF)
Froodite
Formula: α-PdBi2
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Genkinite
Formula: (Pt,Pd,Rh)4Sb3
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Geversite
Formula: PtSb2
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Gold
Formula: Au
Reference: US Geological Survey, 2005, Alaska Resource Data File (ARDF)
Hollingworthite
Formula: (Rh,Pt,Pd)AsS
Reference: Fechner SA (1988) Mineral investigation of the Goodnews Bay mining district Alaska US Bureau of Mines Open File Report 1 88 230 p 2 sheets scales 1 250,000 1 63,360
Hongshiite
Formula: PtCu
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Ilmenite
Formula: Fe2+TiO3
Reference: US Geological Survey, 2005, Alaska Resource Data File (ARDF)
Insizwaite
Formula: Pt(Bi,Sb)2
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Irarsite
Formula: (Ir,Ru,Rh,Pt)AsS
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Fechner SA (1988) Mineral investigation of the Goodnews Bay mining district Alaska US Bureau of Mines Open File Report 1 88 230 p 2 sheets scales 1 250,000 1 63,360
Iridarsenite
Formula: (Ir,Ru)As2
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Fechner SA (1988) Mineral investigation of the Goodnews Bay mining district Alaska US Bureau of Mines Open File Report 1 88 230 p 2 sheets scales 1 250,000 1 63,360
Iridium
Formula: (Ir,Os,Ru)
Reference: Fechner SA (1988) Mineral investigation of the Goodnews Bay mining district Alaska US Bureau of Mines Open File Report 1 88 230 p 2 sheets scales 1 250,000 1 63,360
Iridium var: Platiniridium
Formula: (Ir,Pt)
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Isoferroplatinum
Formula: Pt3Fe
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Magnetite
Formula: Fe2+Fe3+2O4
Reference: US Geological Survey, 2005, Alaska Resource Data File (ARDF)
Mertieite-I (TL)
Formula: Pd11(Sb,As)4
Type Locality:
Reference: Amer.Min.(1973) 58, 1-10
Mertieite-II (TL)
Formula: Pd8Sb2.5As0.5
Type Locality:
Reference: Amer.Min.(1973) 58, 1-10
Niggliite
Formula: PtSn
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Osmium
Formula: (Os,Ir,Ru)
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Platarsite
Formula: PtAsS
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Fechner SA (1988) Mineral investigation of the Goodnews Bay mining district Alaska US Bureau of Mines Open File Report 1 88 230 p 2 sheets scales 1 250,000 1 63,360
Platinum
Formula: Pt
Reference: US Geological Survey, 2005, Alaska Resource Data File (ARDF)
Polarite
Formula: Pd(Bi,Pb)
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Potarite
Formula: PdHg
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Pyrite
Formula: FeS2
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Rhodium
Formula: (Rh,Pt)
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Ruthenarsenite
Formula: (Ru,Ni)As
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Sperrylite
Formula: PtAs2
Reference: Fechner SA (1988) Mineral investigation of the Goodnews Bay mining district Alaska US Bureau of Mines Open File Report 1 88 230 p 2 sheets scales 1 250,000 1 63,360
Tolovkite
Formula: IrSbS
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990
Xingzhongite
Formula: Pb2+Ir3+2S4
Reference: Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Hongshiite1.AG.45PtCu
Iridium1.AF.10(Ir,Os,Ru)
var: Platiniridium1.AF.10(Ir,Pt)
Isoferroplatinum1.AG.35Pt3Fe
Niggliite1.AG.60PtSn
Osmium1.AF.05(Os,Ir,Ru)
Platinum1.AF.10Pt
Potarite1.AD.25PdHg
Rhodium1.AF.10(Rh,Pt)
Group 2 - Sulphides and Sulfosalts
Froodite2.AC.45aα-PdBi2
Genkinite2.AC.35a(Pt,Pd,Rh)4Sb3
Geversite2.EB.05aPtSb2
Hollingworthite2.EB.25(Rh,Pt,Pd)AsS
Insizwaite2.EB.05aPt(Bi,Sb)2
Irarsite2.EB.25(Ir,Ru,Rh,Pt)AsS
Iridarsenite2.AC.45b(Ir,Ru)As2
Mertieite-I (TL)2.AC.15bPd11(Sb,As)4
Mertieite-II (TL)2.AC.10bPd8Sb2.5As0.5
Platarsite2.EB.25PtAsS
Polarite2.AC.40Pd(Bi,Pb)
Pyrite2.EB.05aFeS2
Ruthenarsenite2.CC.15(Ru,Ni)As
Sperrylite2.EB.05aPtAs2
Tolovkite2.EB.25IrSbS
Xingzhongite2.DA.05Pb2+Ir3+2S4
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4

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
Platinum Group Metals and Alloys
Hongshiite1.2.3.1PtCu
Iridium1.2.1.2(Ir,Os,Ru)
Isoferroplatinum1.2.5.1Pt3Fe
Niggliite1.2.10.1PtSn
Osmium1.2.2.1(Os,Ir,Ru)
Platinum1.2.1.1Pt
Potarite1.2.4.4PdHg
Rhodium1.2.1.3(Rh,Pt)
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 4:3
Genkinite2.6.4.1(Pt,Pd,Rh)4Sb3
AmXp, with m:p = 1:1
Polarite2.8.6.1Pd(Bi,Pb)
Ruthenarsenite2.8.17.1(Ru,Ni)As
Xingzhongite2.8.4.1Pb2+Ir3+2S4
AmBnXp, with (m+n):p = 1:2
Froodite2.12.15.1α-PdBi2
Geversite2.12.1.14PtSb2
Hollingworthite2.12.3.8(Rh,Pt,Pd)AsS
Insizwaite2.12.1.15Pt(Bi,Sb)2
Irarsite2.12.3.7(Ir,Ru,Rh,Pt)AsS
Iridarsenite2.12.4.5(Ir,Ru)As2
Platarsite2.12.3.6PtAsS
Pyrite2.12.1.1FeS2
Sperrylite2.12.1.13PtAs2
Tolovkite2.12.3.5IrSbS
Miscellaneous
Mertieite-I (TL)2.16.1.1Pd11(Sb,As)4
Mertieite-II (TL)2.16.3.1Pd8Sb2.5As0.5
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Magnetite7.2.2.3Fe2+Fe3+2O4
Unclassified Minerals, Mixtures, etc.
Iridium
var: Platiniridium
-(Ir,Pt)

List of minerals for each chemical element

OOxygen
O ChromiteFe2+Cr23+O4
O IlmeniteFe2+TiO3
O MagnetiteFe2+Fe23+O4
SSulfur
S Irarsite(Ir,Ru,Rh,Pt)AsS
S PyriteFeS2
S PlatarsitePtAsS
S TolovkiteIrSbS
S XingzhongitePb2+Ir23+S4
S Hollingworthite(Rh,Pt,Pd)AsS
TiTitanium
Ti IlmeniteFe2+TiO3
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe ChromiteFe2+Cr23+O4
Fe IsoferroplatinumPt3Fe
Fe PyriteFeS2
Fe IlmeniteFe2+TiO3
Fe MagnetiteFe2+Fe23+O4
NiNickel
Ni Ruthenarsenite(Ru,Ni)As
CuCopper
Cu HongshiitePtCu
AsArsenic
As Mertieite-IPd11(Sb,As)4
As Mertieite-IIPd8Sb2.5As0.5
As Irarsite(Ir,Ru,Rh,Pt)AsS
As Iridarsenite(Ir,Ru)As2
As PlatarsitePtAsS
As Ruthenarsenite(Ru,Ni)As
As Hollingworthite(Rh,Pt,Pd)AsS
As SperrylitePtAs2
RuRuthenium
Ru Irarsite(Ir,Ru,Rh,Pt)AsS
Ru Iridarsenite(Ir,Ru)As2
Ru Ruthenarsenite(Ru,Ni)As
RhRhodium
Rh Irarsite(Ir,Ru,Rh,Pt)AsS
Rh Rhodium(Rh,Pt)
Rh Hollingworthite(Rh,Pt,Pd)AsS
PdPalladium
Pd Mertieite-IPd11(Sb,As)4
Pd Mertieite-IIPd8Sb2.5As0.5
Pd PolaritePd(Bi,Pb)
Pd PotaritePdHg
Pd Frooditeα-PdBi2
SnTin
Sn NiggliitePtSn
SbAntimony
Sb Mertieite-IPd11(Sb,As)4
Sb Mertieite-IIPd8Sb2.5As0.5
Sb Genkinite(Pt,Pd,Rh)4Sb3
Sb GeversitePtSb2
Sb TolovkiteIrSbS
OsOsmium
Os Osmium(Os,Ir,Ru)
IrIridium
Ir Iridium(Ir,Os,Ru)
Ir Irarsite(Ir,Ru,Rh,Pt)AsS
Ir Iridarsenite(Ir,Ru)As2
Ir Iridium (var: Platiniridium)(Ir,Pt)
Ir TolovkiteIrSbS
Ir XingzhongitePb2+Ir23+S4
PtPlatinum
Pt Genkinite(Pt,Pd,Rh)4Sb3
Pt GeversitePtSb2
Pt PlatinumPt
Pt HongshiitePtCu
Pt InsizwaitePt(Bi,Sb)2
Pt Irarsite(Ir,Ru,Rh,Pt)AsS
Pt IsoferroplatinumPt3Fe
Pt NiggliitePtSn
Pt PlatarsitePtAsS
Pt Iridium (var: Platiniridium)(Ir,Pt)
Pt SperrylitePtAs2
AuGold
Au GoldAu
HgMercury
Hg PotaritePdHg
PbLead
Pb PolaritePd(Bi,Pb)
Pb XingzhongitePb2+Ir23+S4
BiBismuth
Bi InsizwaitePt(Bi,Sb)2
Bi PolaritePd(Bi,Pb)
Bi Frooditeα-PdBi2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Mertie, J.B., Jr., (1976) Platinum deposits in the Goodnews Bay district, Alaska: U.S. Geological Survey Professional Paper 938, 42 p.
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990.
Fechner SA (1988) Mineral investigation of the Goodnews Bay mining district Alaska US Bureau of Mines Open File Report 1 88 230 p 2 sheets scales 1 250,000 1 63,360

USGS MRDS Record:10308867
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