California · Stanislaus County
Past Producer
Grummett-Knox Mine Group
Stanislaus County, California, United States
Manganese
Silica
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USGS source ↗
Commodities
Tertiary
Manganese, Silica
Commodity type
M
Materials
Other materials
Chert, Pyrolusite
Economic & production
Development status
Past Producer
First production
1918
Discovery year
1918
Identification
Deposit ID
10117875
MRDS ID
M020266
Alternate names
Grummett #2 Deposit, Mezzero Deposit
Region
NA
Data score
C
Coordinates
37.52522, -121.34822
References
CAL.DIV.MINES AND GEOL,BULL.152,1950