California · Alameda County
Past Producer
Dewhirst Mine
Alameda County, California, United States
Manganese
Silica
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USGS source ↗
Commodities
Tertiary
Manganese, Silica
Commodity type
M
Materials
Other materials
Chert, Glaucophane, Limonite, Psilomelane, Quartz
Economic & production
Development status
Past Producer
First production
1915
Identification
Deposit ID
10186918
MRDS ID
M004668
Region
NA
Data score
C
Coordinates
37.56911, -121.62133
References
TRASK-GEO.DESCRIPT.MN.DEPS.OF CAL-CAL DIV OF MINES,BUL#152-ADOM BULL 125 P98