Montana · Granite County
Past Producer

True Fissure Mine

Granite County, Montana, United States
SilverLeadManganeseZincCopperGoldArsenicAntimony
⌖ Show on mapUSGS source ↗
Commodities
PrimarySilver, Lead, Manganese, Zinc
SecondaryCopper, Gold
TertiaryArsenic, Antimony
Commodity typeM
Deposit
Deposit typePolymetallic replacement
Model72: Polymetallic replacement
Deposit sizeS
WorkingsSurface/Underground
Orebody formTABULAR, LENTICULAR, PODS
Ore controlJunction Of East-West Fissures With Bedding Faults, Hasmark Fm., Philipsburg Batholith
Materials
Ore mineralsGalena, Psilomelane, Sphalerite, Tennantite
Geology
Host rockMarble,Limestone · Jefferson Limestone;Red Lion Formation
StructurePhilipsburg Batholith, Philipsburg Anticline, Philipsburg Overthrust
Tectonic settingCordilleran Miogeosyncline
Economic & production
Development statusPast Producer
First production1900
Identification
Deposit ID10071347
MRDS IDW014681
RegionNA
Data scoreB
Coordinates46.33489, -113.26564
References
USGS BULL 922-E, P. 157-204.USBM REP INVES 4723, 57 P.USGS BULL 725, P. 146-174.USGS PP 78, P. 211.MBMG BULL 92, P. 10.USGS BULL 1237, P. 15-30, PLATES.USBM R.I. 4723, MINERALS YEARBOOKS, USGS BULL. 922-G