Mine detail: Elkhorn

Previously called ''

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Location

Lat / long:

46.28323, -111.95087

Resource(M)

Primary:	Silver, Gold, Lead, Copper
Secondary:	Bismuth
Ore:	Bismuthinite, Bournonite, Galena, Magnetite, Pyrite, Sphalerite, Tetradymite, Tetrahedrite
Gangue:	Aragonite, Diopside, Dolomite, Quartz, Serpentine
Orebody form:	IRREGULAR
Discovery year:	1875

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Past Producer
First production started:	1875

Geology

Host rock:	Turnley Formation, Metamorphosed Shale;;Limestones, Shale;Madison Formation, Limestone; Quadrant Formation, Quartzite
Host type:	Limestone
Structure:	Boulder Batholith, Extensive Folding Axis N-S With Prevailing Eastward Dip.
Tectonic:	East Margin Of Boulder Batholith
Alteration processes:	Oxidation

References

MRDS	W002871
DEP	10069281
Reference	{Deposit:: WEED, W.H., 1901, GEOLOGY AND ORE DEPOSITS OF THE ELKHORN MINING DISTRICT, JEFFERSON CO., MONTANA, 22 ANN. REPT. USGS P. 399-549}{Deposit:: KNOPF, A., 1913, ORE DEPOSITS OF THE HELENA MINING REGION, MONTANA USGS BULL. 527. P. 128-139.}{Deposit:: PARDEE, J. T. AND F. C. SCHRADER, 1933, METALLIFEROUS DEPOSITS OF THE GREATER HELENA MINING REGION, USGS BULL. 842 P. 299-303.}{Deposit:: 1901 GEOLMAP WEED, W.H., COMPLEX GEOLOGIC INVESTIGATION}{Deposit:: 1913 COMPILE KNOPF, A.}{Deposit:: 1933 COMPILE PARDEE & SCHRADER}
Reporter	Bilbey, Sue A.