Commodities
PrimarySilver, Zinc, Lead
SecondaryCopper, Gold
Commodity typeM
Deposit
Deposit sizeY
WorkingsUnderground
Orebody formSHOOTS
Ore controlContact Of Granodiorite Porphyry And Dolomite And Shale, Northeast Trending Anticline East Of Tacoma Gulch Fault
Materials
Ore mineralsGold, Limonite, Silver, Sphalerite
Geology
Host rockDiorite,Shale,Dolomite · Lodgepole Limestone, Beds Of Limestone And Mudstone;Three Forks Shale, Shale With Sandstone And Limestone;Jefferson Dolomite, Well-Bedded Dolomite
Associated rockDiorite,Andesite · Granodiorite Porphyry Plug;Andesite Porphyry Intrusions;Elkhorn Mountains Volcanics, Andesite, Tuffs
StructureBoulder Batholith, Trail Spring Dome, A Northeast-Trending Elongate Domal Structure, Ore Bodies And Granodiorite Porphyry Plug Bounded By Faults, Tacoma Gulch Fault
Tectonic settingCordilleran Miogeosyncline
AlterationSedimentary Rocks Altered To Hornfels
Economic & production
Development statusPast Producer
Discovery year1880
Identification
Deposit ID10071367
MRDS IDW014708
RegionNA
Data scoreB
Coordinates46.24684, -111.95893
References
ROBY, ACKERMAN, FULKERSON, & CROWLEY, 1960, MINES & MINERAL DEPOSITS - JEFFERSON CO., MT BU. MINES & GEOLOGY BULL. 16.ROBERTSON, F. 1956, GEOCHEMICAL PROSPECTING BY SOIL ANALYSES IN MT, MT BUREAU OF MINES & GEOLOGY BULL. 7BONDURANT & LAWSON, 1968, DIRECTORY OF MINING ENTERPRISES FOR 1968, MT BUREAU OF MINES & GEOLOGY BULL. 72.KLEPPER, M. R., WEEKS, R. A., RUPPEL, E. T., 1957, GEOLOGY OF THE SOUTHERN ELKHORN MOUNTAINS, JEFFERSON AND BROADWARER COUNTIES, MONT.: U. S. GEOL. SURV. PROF. PAPER 292, 82 P.ROBY ET AL, 1960, MBMG BULL. 16.