The Pioneer Mine is a gold and silver mine located in Custer county, Colorado at an elevation of 9,199 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: 9,199 Feet (2,804 Meters)
Commodity: Gold, Silver
Lat, Long: 38.11028, -105.33917
Map: View on Google Maps
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Pioneer Mine MRDS details
Site Name
Primary: Pioneer Mine
Secondary: Big Bonnie
Secondary: Claims: Rocky Point, Delta Fox, Sunset
Commodity
Primary: Gold
Primary: Silver
Secondary: Copper
Secondary: Lead
Location
State: Colorado
County: Custer
District: Rosita Hills District
Land Status
Land ownership: Federal
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
Type: Underground
Ownership
Owner Name: Art Williams
Home Office: Rockvale, Co.
Years: 1959 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Underground
Discovery Year: 1874
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
Model Name: Epithermal veins
Model Name: Epithermal vein, generic
Orebody
Not available
Structure
Type: R
Description: Rosita Volcanic Center, Wet Mtns
Type: L
Description: Rosita Fault
Alterations
Alteration Type: L
Alteration Text: Strong Argillization
Rocks
Name: Trachyte
Role: Host
Age Type: Host Rock
Age Young: Oligocene
Analytical Data
Not available
Materials
Ore: Tetrahedrite
Ore: Silver
Ore: Covellite
Ore: Chalcopyrite
Ore: Stephanite
Ore: Galena
Ore: Malachite
Ore: Pyrite
Gangue: Calcite
Gangue: Barite
Gangue: Clay
Comments
Comment (Development): LAST DEVELOPMENT KNOWN IN 1960
Comment (Geology): Vein trends N15W, dips 65 east, and intersects Leavenworth vein; ore is concentrated near the intersection.
Comment (Location): ON SADDLE BETWEEN MT ROBINSON AND PRINGLE HILL, IN THE N/2 SEC.29, T 22 S, R 71 W; INFO FROM LAND.ST :(1976)
Comment (Production): CREDITED BY MINT WITH $110,000 AU AND $37,000 AG PRODUCTION; GOLD VALUES DOUBTFUL
Comment (Reserve-Resource): A 1981 report suggested that low-grade, bulk-tonnage silver deposits may occur along the Pioneer vein and south of the Leavenworth-Humboldt-Pocahontas vein. (Sunshine files)
Comment (Workings): 235 FT SHAFT, 850 FT TUNNEL ADVANCED IN 1959
References
Reference (Production): EMMONS, S.F., 1896
Reference (Deposit): CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.
Reference (Deposit): Emmons, S.F., 1896, The mines of Custer County, Colorado: U.S. Geological Survey 17th Annual Report, Pt. 2, pp. 405-472.
Reference (Deposit): SHARP, W.N., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081, 1:24,000.
Reference (Reserve-Resource): Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.
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