Mine detail: Big Four Mine

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Location: Larimer County, Colorado, United States, North America
Lat / long: 40.49581, -105.20809
dep_id: 10013970
mrds_id: D010549
Commodity type: metallic
Major mineral: Silver, Gold
Operation type: Unknown
Deposit type: Vein
Production size: Small ammount of material produced
Development status: Producer
gangue: Montmorillonite
alteration: Hydrothermal Montmorillonite In Fractures
ore_ctrl: Primary Joints And Fractures In Stock
Reporter: Schwochow, Stephen D.
hrock_unit: Tonalite;Metasedimentary Rocks--Mica Schist
hrock_type: Tonalite
arock_unit: Tonalite
arock_type: Tonalite
Structure: Front Range Uplift, Cheyenne Basin, Big Thompson Anticline, Milner Mountain Fault, Fletcher Hill (Buck Horn) Fault, Masonville Anticline, Buckhorn Syncline, Masonville Stock , Redstone Fault
tectonic: Central Cordillera (Southern Rocky Mtns)
References:
  • Deposit:: WOLFE, J.A., 1953, GEOLOGY OF THE MASONVILLE MINING DISTRICT, LARIM ER COUNTY, COLORADO: COLORADO SCHOOL OF MINES M.SC. THESIS T-789.
  • Deposit:: BRADDOCK, W.A., AND OTHERS, 1970, GEOLOGIC MAP OF THE MASONVILLE QU ADRANGLE, LARIMER COUNTY, COLORADO: USGS MAP GQ-832.
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