Commodities
PrimarySilver, Gold, Lead, Copper
SecondaryBismuth
Commodity typeM
Deposit
Deposit sizeY
WorkingsUnderground
Orebody formIRREGULAR
Ore controlAlong Bedding Plane On Underside Of Fold Under A Metamorphosed Shale
Materials
Ore mineralsBismuthinite, Bournonite, Galena, Magnetite, Pyrite, Sphalerite, Tetradymite, Tetrahedrite
GangueAragonite, Diopside, Dolomite, Quartz, Serpentine
Geology
Host rockLimestone · Turnley Formation, Metamorphosed Shale;;Limestones, Shale;Madison Formation, Limestone; Quadrant Formation, Quartzite
StructureBoulder Batholith, Extensive Folding Axis N-S With Prevailing Eastward Dip.
Tectonic settingEast Margin Of Boulder Batholith
AlterationOxidation
Economic & production
Development statusPast Producer
First production1875
Discovery year1875
Identification
Deposit ID10069281
MRDS IDW002871
RegionNA
Data scoreB
Coordinates46.28323, -111.95087
References
WEED, W.H., 1901, GEOLOGY AND ORE DEPOSITS OF THE ELKHORN MINING DISTRICT, JEFFERSON CO., MONTANA, 22 ANN. REPT. USGS P. 399-549KNOPF, A., 1913, ORE DEPOSITS OF THE HELENA MINING REGION, MONTANA USGS BULL. 527. P. 128-139.PARDEE, J. T. AND F. C. SCHRADER, 1933, METALLIFEROUS DEPOSITS OF THE GREATER HELENA MINING REGION, USGS BULL. 842 P. 299-303.1901 GEOLMAP WEED, W.H., COMPLEX GEOLOGIC INVESTIGATION1913 COMPILE KNOPF, A.1933 COMPILE PARDEE & SCHRADER