Records
3
Contra Costa County Underground Mines
California · 3 underground-eligible records
Verified
0
Unconfirmed
3
With photos
0
Major commodities
- Copper · 2
- Mercury · 1
Working types (source)
- Underground · 2
- Mixed Underground/Surface · 1
Mines in this county
Summit of Zion
California
Unconfirmed Copper
Documented shaft/adit evidence
Sycamore Canyon
California
Unconfirmed Copper
Mount Diablo Mine
California
Unconfirmed Mercury Mixed Underground/Surface
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