Montana · Jefferson County
Past Producer

Alta Mine

Jefferson County, Montana, United States
SilverZincLeadCopperSilicaGoldAntimony
⌖ Show on mapUSGS source ↗
Commodities
PrimarySilver, Zinc, Lead
SecondaryCopper, Silica, Gold
TertiaryAntimony
Commodity typeM
Deposit
Deposit typePolymetallic veins
Model85: Polymetallic veins
Deposit sizeS
WorkingsSurface/Underground
Orebody formIRREGULAR SHOOTS
Ore controlShear Zone
Materials
Ore mineralsPyrite, Gold, Sphalerite, Tetrahedrite, Galena
GangueQuartz, Sericite, Tourmaline, Rhodochrosite
Geology
Host rockAndesite · ELKHORN MOUNTAINS VOLCANICS
Associated rockAndesite · Elkhorn Mountain Volcanics;Boulder Batholith, Butte Quartz Monzonite;Elkhorn Mountains Volcanics
StructureBoulder Batholith, South-Trending Syncline In Elkhorn Mountains Volcanics, Roof Pendant Of Elkhorn Mountain Volcanics
Tectonic settingCordilleran Miogeosyncline
AlterationVolcanic Rocks In Shear Zone Are Intensley Altered, Oxidation Near Surface, Tourmalinization
Economic & production
Development statusPast Producer
Discovery year1869
Identification
Deposit ID10089196
MRDS IDW014733
RegionNA
Data scoreA
Coordinates46.37212, -112.09394
References
YOUNG, F.M., CROWLEY, F.A., AND SAHINEN, U.M., 1962, MARKETING PROBLEMS OF SMALL BUSINESS ENTERPRISES ENGAGED IN LEAD AND ZINC MINING: MBMG BULL 30, P. 24ROBY,R.N., ACKERMAN, W.C., FULKERSON, F.B., AND CROWLEY, F.A., 1960, MINES AND MINERAL DEPOSITS (EXCEPT FUELS), JEFFERSON COUNTY, MONTANA: MBMG BULL 16, P. 6, 26, 44-7, 51, 107.HANSEN, MILLER, 1971, DIRECTORY OF MINING ENTERPRISES FOR 1970: MBMG BULL 82ROBERTSON, FORBES, 1956, GEOCHEMICAL PROSPECTING BY SOIL ANALYSIS IN MONTANA: MBMG BULL 7BECRAFT, G.E., PINCKNEY, D.M., AND ROSENBLUM, SAM, 1963, GEOLOGY AND MINERAL DEPOSITS OF THE JEFFERSON CITY QUADRANGLE, JEFFERSON AND LEWIS AND CLARK COUNTIES, MONTANA: USGS PP 428, P. 36, 38, 40, 53, 70, 71KNOPF, ADOLF, 1913, ORE DEPOSITS OF THE HELENA MINING REGION: USGS BULL 527, P. 109-10.PARDEE, J.T., AND SCHRADER, F.C, 1933, METALLIFEROUS DEPOSITS OF THE GREATER HELENA MINING REGION: USGS BULL 842, P. 241-2.MBMG BULL. 16, USGS PROF. PAPER 428