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Keystone Gold District, Pennington Co., South Dakota, USA



Detailed Mineral List:
Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 1 other locality in this region.
Ankerite
Formula: Ca(Fe2+ ,Mg,Mn2+)(CO3)2
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 3 other localities in this region.
Arsenopyrite
Formula: FeAsS
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 6 other localities in this region.
Biotite
Reference: USGS Prof Paper 610 "Principal Gold Producing Districts of the United States"
Localities: Recorded from at least 2 other localities in this region.
Bismite
Formula: Bi2O3
Locality: Cobalt lode (Margaret Tin Mine), Keystone Gold District, Pennington Co., South Dakota, USA
Bismuth
Formula: Bi
Locality: Cobalt lode (Margaret Tin Mine), Keystone Gold District, Pennington Co., South Dakota, USA
Bismuthinite
Formula: Bi2S3
Locality: Cobalt lode (Margaret Tin Mine), Keystone Gold District, Pennington Co., South Dakota, USA
Calcite
Formula: CaCO3
Locality: Columbia Mine (Maiden Mine), Keystone, Keystone Gold District, Pennington Co., South Dakota, USA
Chalcopyrite
Formula: CuFeS2
Reference: USGS Prof Paper 610 "Principal Gold Producing Districts of the United States"
Localities: Recorded from at least 4 other localities in this region.
'Chlorite Group'
Reference: USGS Prof Paper 610 "Principal Gold Producing Districts of the United States"
Localities: Recorded from at least 2 other localities in this region.
Cummingtonite
Formula: ☐{Mg2}{Mg5}(Si8O22)(OH)2
Locality: Bullion-Columbia Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Diadochite
Formula: Fe3+2(PO4)(SO4)(OH) · 5H2O
Locality: Legal Tender Group, Keystone Gold District, Pennington Co., South Dakota, USA
Diopside
Formula: CaMgSi2O6
Localities: Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA
Etta Formation, Keystone Gold District, Pennington Co., South Dakota, USA
Epsomite
Formula: MgSO4 · 7H2O
Locality: Nathaniel Pope, Keystone Gold District, Pennington Co., South Dakota, USA
'Feldspar Group'
Locality: Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA
'Garnet Group'
Formula: X3Z2(TO4)3 (X = Ca, Fe, etc · , Z = Al, Cr, etc · , T = Si, As, V, etc · )
Reference: USGS Prof Paper 610 "Principal Gold Producing Districts of the United States"
Localities: Recorded from at least 1 other locality in this region.
Gold
Formula: Au
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 13 other localities in this region.
Graphite
Formula: C
Reference: USGS Prof Paper 610 "Principal Gold Producing Districts of the United States"
Localities: Recorded from at least 3 other localities in this region.
Hedenbergite
Formula: CaFe2+Si2O6
Locality: Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA
'Hornblende'
Reference: USGS Prof Paper 610 "Principal Gold Producing Districts of the United States"
Localities: Recorded from at least 6 other localities in this region.
Magnesite
Formula: MgCO3
Locality: Bismark-Ida Florence Groups, Keystone Gold District, Pennington Co., South Dakota, USA
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 3 other localities in this region.
Pickeringite
Formula: MgAl2(SO4)4 · 22H2O
Localities: Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Keystone Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Bullion-Columbia Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Pyrite
Formula: FeS2
Localities: Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Bismark-Ida Florence Groups, Keystone Gold District, Pennington Co., South Dakota, USA
Grand Island Group, Keystone Gold District, Pennington Co., South Dakota, USA
Juniper Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Legal Tender Group, Keystone Gold District, Pennington Co., South Dakota, USA
Pyrrhotite
Formula: Fe1-xS (x = 0 to 0.17)
Reference: USGS Prof Paper 610 "Principal Gold Producing Districts of the United States"
Localities: Recorded from at least 6 other localities in this region.
Quartz
Formula: SiO2
Reference: R&M 75:3 pp 156-169
Localities: Recorded from at least 11 other localities in this region.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Locality: Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Siderite
Formula: FeCO3
Locality: Bismark-Ida Florence Groups, Keystone Gold District, Pennington Co., South Dakota, USA
Silver
Formula: Ag
Localities: Recorded from at least 11 localities in this region.
Sphalerite
Formula: ZnS
Reference: USGS Prof Paper 610 "Principal Gold Producing Districts of the United States"
Localities: Recorded from at least 4 other localities in this region.
Staurolite
Formula: (Fe2+,Mg,Zn)1.5-2Al9(SiO4)4O6(OH,O)2
Locality: Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Titanite
Formula: CaTi(SiO4)O
Localities: Etta Formation, Keystone Gold District, Pennington Co., South Dakota, USA
Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA
Triplite
Formula: (Mn2+,Fe2+)2(PO4)(F,OH)
Locality: Cobalt lode (Margaret Tin Mine), Keystone Gold District, Pennington Co., South Dakota, USA
Zoisite
Formula: {Ca2}{Al3}(Si2O7)(SiO4)O(OH)
Localities: Bullion Formation, Keystone Gold District, Pennington Co., South Dakota, USA
Etta Formation, Keystone Gold District, Pennington Co., South Dakota, USA


34 entries listed. 29 valid minerals.
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