Montana · Fergus County
Past Producer

Cumberland Mine

Fergus County, Montana, United States
GoldSilver
⌖ Show on mapUSGS source ↗
Commodities
PrimaryGold, Silver
Commodity typeM
Deposit
Deposit sizeY
WorkingsUnderground
Orebody formOVAL (REPLACEMENT)
Ore controlOre Occurs Along Contact Of Limestone And Syenite Porphyry And In Porphyry Near The Contact
Materials
Ore mineralsSylvanite
Geology
Host rockSyenite · Madison Series, Massive Limestone
StructureJudith Mts. - Domal Structures Intruded By Cret - Tert Lacoliths, Replacement Deposit Covered By Network Of Small Fractures; A Fault Terminates The Contact Vein
Tectonic settingRocky Mountain Foreland
Economic & production
Development statusPast Producer
Discovery year1885
Identification
Deposit ID10071314
MRDS IDW014641
RegionNA
Data scoreB
Coordinates47.18186, -109.20829
References
ROBERTSON, A. F., 1950, MINES & MINERAL DEPOSITS - FERGUS COUNTY, U.S. BUREAU MINES INF. CIRC. 7544.CORRY, A. V., 1933, SOME GOLD DEPOSITS - BROADWATER, BEAVERHEAD, PHILLIPS, AND FERGUS CO., MT BUREAU OF MINES & GEOLOGY MEMOIR 10.ROBERTSON, 1950, U.S.B.M. INF. CIRC. 7544