Mine detail: Masonville District

Previously called ''

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Location

Lat / long:

40.48692, -105.21087

Resource(M)

Primary:	Gold, Silver
Secondary:	Tungsten
Tertiary:	Copper, Nickel
Ore:	Chalcopyrite, Pyrite, Scheelite
Gangue:	Epidote, Hematite, Limonite, Malachite, Montmorillonite, Quartz
Discovery year:	1900

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	Small
Development status:	Producer
Last production ended:	1955

Geology

Host rock:	Tonalite;Metasedimentary Rocks--Mica Schist
Host type:	Tonalite
Associated rock:	Tonalite;Diorite And Andesite
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; Wallrock Silicification ; Sericitization Of Andalusite In Schist

References

MRDS	D010561
DEP	10107993
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.}{Deposit:: BELSER, CARL, 1956, TUNGSTEN POTENTIAL IN CHAFFEE, FREMONT, GUNNISO N, LAKE, LARIMER, PARK, AND SUMMIT COUNTIES, COLORADO: USBM IC-7748, P . 18.}{Deposit:: BLM MINERAL SURVEYS}{Deposit:: VANDERWILT, J.W., 1947, MINERAL RESOURCES OF COLORADO: COLORADO MIN ERAL RESOURCES BD., P. 139.}{Deposit:: COLORADO DIV. MINES INF. REPTS.}{Production:: VANDERWILT, 1947, P. 139; BELSER, 1956, P. 18}
Reporter	Schwochow, Stephen D.