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

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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.
Photo: © Christopher Wentzell. Almandine from Holy Terror Mine, Keystone Gold District, Pennington Co., South Dakota, USA
Ankerite
Formula: Ca(Fe2+,Mg)(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'
Formula: X3Z2(SiO4)3
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: Reported from at least 6 localities in this region.
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 12 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: Reported 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.
Mineral and/or Locality  
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