Mine detail: Big Four Mine

Previously called ''

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Location

Lat / long:

40.49581, -105.20809

Resource(M)

Primary:	Silver, Gold
Gangue:	Montmorillonite

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	Small
Development status:	Producer

Geology

Host rock:	Tonalite;Metasedimentary Rocks--Mica Schist
Host type:	Tonalite
Associated rock:	Tonalite
Associated 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)
Alteration processes:	Hydrothermal Montmorillonite In Fractures

References

MRDS	D010549
DEP	10013970
Reference	{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.}
Reporter	Schwochow, Stephen D.