Mine detail: Valley Forge Mine

<< Back to the map

<< Back to browsing

Location: Lewis and Clark County, Montana, United States, North America
Lat / long: 46.49157, -112.24117
dep_id: 10015839
mrds_id: DB02093
Commodity type: metallic
Major mineral: Silver, Lead, Gold
Minor mineral: Zinc, Copper
Trace mineral: Arsenic
Operation type: Unknown
Production size: Small ammount of material produced
Development status: Past Producer
ore: Chalcopyrite, Galena, Gold, Sphalerite
gangue: Pyrite, Quartz, Tourmaline
work_type: Underground
alteration: Sericitization
ore_ctrl: Lee Mountain-Valley Forge Shear Zone
Reporter: Elliott, James E., Wise, Kristine K. (Elliott, James E.)
hrock_type: Quartz Monzonite
arock_unit: Butte Quartz Monzonite (Boulder Batholith)
arock_type: Quartz Monzonite
Structure: Boulder Batholith, Lee Mountain-Valley Forge Shear Zone
Year first produced: 1885
References:
  • Deposit:: USGS BULL 527, P. 82-3.
  • Deposit:: USGS BULL 842, P. 257-58.
  • Deposit:: USGS PP 428, P. 55, PL. 1.
  • Production:: USGS PP 428, P. 55; USGS BULL 842, P. 257.
© 2010-2018 Lee C. Baker unless noted. All rights reserved.