The Shafer Lease Occurrence is a chromium mine located in Tuolumne county, California.
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
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.
Shafer Lease Occurrence MRDS details
Site Name
Primary: Shafer Lease Occurrence
Secondary: Pereira 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: Rosasco
Production
Year: 1918
Material type: ORE
Description: Ap_Grade: ^30.5% Cr2o3
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year Last Production: 1918
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
Not available
Alterations
Alteration Type: L
Alteration Text: Serpentinized Host Rock
Rocks
Name: Dunite
Role: Host
Age Type: Host Rock
Age Young: Late Jurassic
Analytical Data
Analytical Data: 23.6% CR2O3
Materials
Ore: Chromite
Comments
Comment (Commodity): ASSAY BY USBM, 1918
Comment (Location): LEASE LOCATED ON FLAT VALLEY FLOOR A SHORT DISTANCE NORTH OF TABLE MTN.
Comment (Development): A FEW HUNDRED TONS OF MILLING ORE REMAIN ON THE LEASE.
Comment (Workings): WORKINGS CONSIST OF A FLOODED SHAFT AND AN OPEN CUT APPROX. 30 FT LONG, 6 FT DEEP AND 5-6 FT WIDE.
Comment (Geology): THE DEPOSIT OCCURS IN THE NORTHERN PART OF THE WESTERN MOST OF TWO SERPENTINE BELTS THAT TREND NW 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, CHAP. 1, P. 26
Reference (Production): CDMG BULL 134, PT. 3, CHAPT. 1, P. 26.
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.
