Mine detail: Mason Mine

Previously called 'Mason Ranch Mine'

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Location

Lat / long:

40.50081, -105.21115

Resource(M)

Primary:	Silver, Tungsten, Gold
Ore:	Pyrite, Scheelite
Gangue:	Epidote, Hematite, Montmorillonite, Quartz

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	D010552
DEP	10013973
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.}{Deposit:: COBB, H.S., 1960, TUNGSTEN MINES OF COLORADO: COLORADO METAL MINING FUND BD., P. 49.}{Deposit:: BELSER, CARL, 1956, TUNGSTEN POTENTIAL IN CHAFFEE, FREMONT, GUNNISO N, LAKE, LARIMER, PARK, AND SUMMIT COUNTIES, COLORADO: USBM IC-7748, P . 18.}
Reporter	Schwochow, Stephen D.