The Richards Mine is a chromium mine located in Tuolumne county, California at an elevation of 1,250 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: 1,250 Feet (381 Meters)
Commodity: Chromium
Lat, Long: 37.90833, -120.49139
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.
Richards Mine MRDS details
Site Name
Primary: Richards Mine
Secondary: Rough and Ready Mine 1918
Commodity
Primary: Chromium
Location
State: California
County: Tuolumne
District: Peoria Flat Area
Land Status
Land ownership: Private
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: Otis Rosasco,
Home Office: Star Route, Box 150, Jamestown, Ca. 95327.
Owner Name: Bradley Mining Co.
Years: 1942 -
Production
Year: 1918
Material type: ORE
Description: Ap_Grade: ^36.7% Cr2o3
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Form: LENSE
Structure
Type: R
Description: Bear Mountain Fault Zone Trending Nw
Type: L
Description: Shearing In Host Rock Strongly Developed In A N 65-75 W Direction.
Alterations
Alteration Type: L
Alteration Text: Serpentinization And Silicification Of Host Rock.
Rocks
Name: Dunite
Role: Host
Age Type: Host Rock
Age Young: Late Jurassic
Name: Dunite
Role: Host
Age Type: Host Rock Unit
Age Young: Late Permian
Analytical Data
Analytical Data: 36.7% CR2O3
Materials
Ore: Chromite
Comments
Comment (Commodity): ASSAY OF HIGH GRADE ORE SHIPPED DURING WWI.
Comment (Deposit): AN ORE ZONE, AS DESCRIBED ABOVE, WAS EXPOSED IN THE FLOOR AND NORTH WALL OF THE MAIN PIT.
Comment (Workings): WORKINGS CONSISTED OF AN OPEN CUT 180 FT LONG, 20-30 FT WIDE, 10-20 FT DEEP, TRENDING N 60 W, TWO SHORT ADITS DRIVEN NIDE AND S 60 E, AND SEVERAL SHALLOW PROSPECT TRENCHES (1975).
Comment (Geology): THE DEPOSIT OCCURS IN THE NORTHERN PART OF THE WESTERNMOST OF TWO SERPENTINE BELTS THAT TREND NW-SE ACROSS THE COUNTY. THE BELT IS EXPOSED OVER AN AREA. 30 KM BY 6 KM.
References
Reference (Deposit): CATER, F. W. JR., 1948, CDMG BULL 134, PART 3, CHAPT. 1, P. 27, 28.
Reference (Production): CDMG MINERAL PROPERTY REPORT, UNPUBLISHED
Reference (Deposit): STINSON, M. C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED
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.
