The South Thomas is a manganese mine located in Mendocino county, California at an elevation of 1,499 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: 1,499 Feet (457 Meters)
Commodity: Manganese
Lat, Long: 39.30639, -123.16944
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
South Thomas MRDS details
Site Name
Primary: South Thomas
Commodity
Primary: Manganese
Location
State: California
County: Mendocino
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Iva V. And Raymond H. Travis
Production
Not available
Deposit
Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: L
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Coast Ranges
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Name: Shale
Role: Host
Age Type: Host Rock
Age Young: Late Cretaceous
Name: Shale
Role: Host
Age Type: Host Rock Unit
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Psilomelane
Comments
Comment (Workings): SHALLOW CUTS; TWO SHORT ADITS; OPEN CUT.
Comment (Geology): ORE HOSTED IN FRANCISCAN COMPLEX--L. TO L. LENSES AND PODS OF RATHER HIGH-GRADE OXIDE ORE ARE FOUND, BUT MUCH OF THE ORE CONTAINS LARGE AMOUNTS OF WHITE CHERT. ORE THICKNESS VARIES FROM 1 FT. TO 2 FT. AND ORE IS NOT OF UNIFORM VALUE. ; GEOL.DESC: 2 PARALLEL BEDS OF MANGANESE ORE SEPARATED BY 15 FT. OF WELL-BEDDED RED CHERT. LENSES AND POCKETS OF HIGH GRADE OXIDE ORE ARE PRESENT. LOWER BED IS SHEARED AND CUT BY FRACTURES FILLED WITH BLACK OXIDE.
Comment (Deposit): LENSES AND PODS OF RATHER HIGH-GRADE OXIDE ORE ARE FOUND, BUT MUCH OF THE ORE CONTAINS LARGE AMOUNTS OF WHITE CHERT. ORE THICKNESS VARIES FROM 1 FT. TO 2 FT. AND ORE IS NOT OF UNIFORM VALUE.
Comment (Location): LOCATED IN NE 1/4 SECTION 27
Comment (Production): ABOUT 1,500 TONS OF BLACK OXIDE ORE WERE SHIPPED FROM THIS MINE. MINE IDLE SINCE WORLD WAR I AND ROAD IS NOW IMPASSABLE.
References
Reference (Deposit): CALIF. JOUR. MINES & GEOLOGY, V. 49, NO. 4, OCT., 1953, PP. 363, 390-391
Reference (Deposit): D.O.M. BULL. 152, PP. 137-139
California Gold
"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more: Where to Find Gold in California.
