California · Mendocino County
Past Producer
Thomas Mine
Mendocino County, California, United States
Manganese
Silica
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USGS source ↗
Commodities
Tertiary
Manganese, Silica
Commodity type
M
Materials
Other materials
Chert, Psilomelane, Pyrolusite
Economic & production
Development status
Past Producer
First production
1914
Discovery year
1912
Identification
Deposit ID
10285652
MRDS ID
M045326
Alternate names
North Thomas Mine,Round MountainRound Mountain
Region
NA
Data score
C
Coordinates
39.31047, -123.17529
References
CDMG BULLETINS:152,1950, #125,1943, #76,1918USBM R.I.5579,1960USGS FILE,1917-18