Records
4
Marin County Underground Mines
California · 4 underground-eligible records
Verified
0
Unconfirmed
4
With photos
0
Major commodities
- Copper · 2
- Mercury · 1
- Sand and Gravel · 1
Working types (source)
- Other / unspecified · 2
- Underground · 2
Mines in this county
Pike Gulch
California
Unconfirmed Copper
Union Gulch
California
Unconfirmed Copper
Angel Island Dredge
California
Unconfirmed Sand and Gravel
Gambonini
California
Unconfirmed Mercury Mixed Underground/Surface
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