Records
38
Napa County Underground Mines
California · 38 underground-eligible records
Verified
0
Unconfirmed
38
With photos
0
Major commodities
- Mercury · 15
- Chromium · 13
- Magnesite · 3
- Silver · 2
- Copper · 2
- Gold · 1
- Manganese · 1
- Asbestos · 1
Working types (source)
- Other / unspecified · 23
- Underground · 8
- Mixed Underground/Surface · 7
Related mining districts
- East Mayacmas · 20
Mines in this county
Bella Oak
California
Unconfirmed Mercury
Documented adit evidence
Granada
California
Unconfirmed Mercury
Documented adit evidence
Ivanhoe
California
Unconfirmed Mercury
Historical mapped workings available
La Joya
California
Unconfirmed Mercury
Historical mapped workings available
Napa Copper
California
Unconfirmed Copper
Oat Hill Mine
California
Unconfirmed Mercury
Documented adit evidence
Twin Peaks
California
Unconfirmed Mercury
Historical mapped workings available
Valley
California
Unconfirmed Mercury
Historical mapped workings available
Aetna
California
Unconfirmed Mercury Mixed Underground/Surface
Documented adit evidence
Aetna Extension
California
Unconfirmed Mercury Mixed Underground/Surface
Historical mapped workings available
Corona
California
Unconfirmed Mercury Mixed Underground/Surface
Documented adit evidence
Crystal Creek Claim
California
Unconfirmed Chromium
Grey Claim
California
Unconfirmed Chromium Mixed Underground/Surface
Kellett
California
Unconfirmed Mercury Mixed Underground/Surface
Documented adit evidence
Knoxville Mine
California
Unconfirmed Mercury Mixed Underground/Surface
Documented shaft/adit evidence
Monticello Asbestos Mine
California
Unconfirmed Asbestos
Moore Mine
California
Unconfirmed Chromium Mixed Underground/Surface
Documented adit evidence
Twin Peaks Mine
California
Unconfirmed Mercury
Historical mapped workings available
Black Hawk Claim
California
Unconfirmed Chromium Mixed Underground/Surface
Chrome Center Claim
California
Unconfirmed Chromium Mixed Underground/Surface
Corona Mine
California
Unconfirmed Mercury Mixed Underground/Surface
Documented adit evidence
Elder
California
Unconfirmed Magnesite Mixed Underground/Surface
Elder Claim
California
Unconfirmed Chromium Mixed Underground/Surface
Fourth of July Claim
California
Unconfirmed Chromium Mixed Underground/Surface
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