Mine detail: Big Seven Mine

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Location: Cascade County, Montana, United States, North America
Lat / long: 46.94908, -110.70556
dep_id: 10071381
mrds_id: W014726
Commodity type: metallic
Major mineral: Silver, Gold
Minor mineral: Copper, Lead
Trace mineral: Molybdenum, Zinc
Operation type: Unknown
Deposit type: Polymetallic veins
Production size: Production occurred
Development status: Past Producer
ore: Chalcopyrite, Freibergite, Galena, Molybdenite, Proustite, Pyrite, Sphalerite
orebody_fm: TABULAR
work_type: Underground
model: 85: Polymetallic veins
alteration: Sericitization & Silicification
ore_ctrl: Northeast-Trending Fractures, Snow Creek Porphyry; Vein Narrow In Pinto Diorite, Wider And Richer In Gneiss
Reporter: Mlynarczyk, Meg S.
hrock_unit: Belt, Neihart Quartzite;Gneiss And Schist
hrock_type: Diorite,Quartzite,Gneiss,Rhyolite
arock_unit: Snow Creek Porphyry-Pluton And Dikes Of Rhyolite Porphyry;Pinto Diorite-Large Phenocrysts Of Feldspar & Hornblende
arock_type: Diorite,Rhyolite
Structure: Zone Of Igneous Intrusions Covering Over 800 Square Km., Domal Uplift Caused By Intrusion Of Snow Creek Porphyry, Northeast-Trending Fractures And Faults
tectonic: Rocky Mountain Foreland
disc_yr: 1892
discr: Big Seven Mining Co.
References:
  • Deposit:: ROBERTSON, A. F., 1951, MINES & MINERAL DEPOSITS - CASCADE COUNTY, MONTANA, U.S. BUREAU MINES INF. CIRC. 7589.
  • Deposit:: SCHAFER, P. A., 1935, GEOLOGY AND ORE DEPOSITS - NEIHART MINING DISTRICT, CASCADE CO., MONTANA, MT BUREAU OF MINES & GEOLOGY MEM. 13
  • Deposit:: KLEINKOPF, M. D., WITKIND, I. J., AND KEEFER, W. R., 1972, AEROMAGNETIC, BOUGUER GRAVITY, AND GENERLIZED GEOLOGIC MAPS OF THE CENTRAL PART OF THE LITTLE BELT MOUNTAINS, MONTANA: U.S. GEOLOGICAL SURVEY MAP GP-837
  • Geology:: WEED, W.H., 1900, THE GEOLOGY OF THE LITTLE BELT MOOUNTAINS, MONTANA: U.S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT, PART 3, P. 437-439.
  • Production:: ROBERTSON, 1951, U.S.B.M. INF. CIRC. 7589
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