The Rockfield Mine is a gold and silver mine located in Larimer county, Colorado at an elevation of 7,959 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 7,959 Feet (2,426 Meters)
Commodity: Gold, Silver
Lat, Long: 40.71167, -105.60194
Map: View on Google Maps
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Rockfield Mine MRDS details
Site Name
Primary: Rockfield Mine
Secondary: Unpatented Claims: Rodkfield
Secondary: Pendergast Tunnel
Secondary: Valentine Lod E
Secondary: Matchless Nos. 1 and 2
Commodity
Primary: Gold
Primary: Silver
Location
State: Colorado
County: Larimer
District: Manhattan District
Land Status
Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Not available
Ownership
Owner Name: S. A. And W. T. Pendergast
Home Office: Log Cabin
Years: 1941 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year First Production: 1937
Year Last Production: 1941
Discovery Year: 1916
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Type: R
Description: Front Range Uplift, Sherman Batholith
Type: L
Description: Poudre River Shear Zone, Elkhorn Creek Shear Zone
Alterations
Not available
Rocks
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene
Name: Quartz Monzonite
Role: Associated
Age Type: Host Rock
Age Young: Neoproterozoic
Name: Quartz Monzonite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene
Analytical Data
Analytical Data: MILLING ORE FROM 1941 REPORTEDLY CONTAINED 18 OZ/TON AU AND 1.5 OZ /TON AG.
Materials
Ore: Pyrite
Comments
Comment (Location): SOUTH OF SEVENMILE CREEK BASED ON BLM RECORD OF PENDERGAST TUNNEL CLAIM RECORD. ELEV AND LAT-LONG GIVEN ARE FOR CENTER SW SEC. 29 ; INFO FROM LAND.ST :1980
Comment (Production): EXPLORATION AND DEVELOPMENT FROM 1923-36; PRODUCTION IN 1937 AND 1 941; NO PRODUCTION IN 1938-40.
Comment (Deposit): AIRPHOTOS INDICATE PROBABLE QUARTZ MONZONITE DIKE TRENDING N76 TO 82E THROUGH METAMORPHICS FROM N2 SE SEC. 30 ACROSS N EDGE OF SW SEC. 29 TO S2 S2 NE SEC. 29.
Comment (Workings): 900-FT CROSSCUT TUNNEL AND SHORT CROSSCUTS; SURFACE TRENCHES
References
Reference (Deposit): LOVERING, T.S., AND GODDARD, E.N., 1950, GEOLOGY AND ORE DEPOSITS O F THE FRONT RANGE, COLORADO: USGS PROF. PAPER 223, P. 285-286
Reference (Deposit): COLORADO DIV. MINES INF. REPT. AND ANNUAL OPERATOR REPT.
Reference (Production): COLORADO DIV. MINES ANN. OPERATOR REPTS.
Colorado Mining Photos
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