Bonanza Claim
California
Unconfirmed Chromium
Historical mapped workings available
Iridium underground mines
Catalog records where USGS source data lists Iridium among mined commodities. Reported minerals on a mine page are tracked separately and are not the same as commodities.
- Underground mine records
- 13
- Independently verified
- 0
Representative records
Estrella Mine
California
Unconfirmed Chromium
French Hill Chrome Mine
California
Unconfirmed Chromium
Grey Claim
California
Unconfirmed Chromium
Holston Mine
California
Unconfirmed Chromium
Judy Mine
California
Unconfirmed Chromium
Documented shaft evidence
Long Ledge No. 3
California
Unconfirmed Chromium
Mann and Ross Mine
California
Unconfirmed Gold
Moore Mine
California
Unconfirmed Chromium
Documented adit evidence
Peg Leg Mine
California
Unconfirmed Chromium
Documented adit evidence
Seiad Creek
California
Unconfirmed Chromium
Documented adit evidence
Sweetwater Mine
California
Unconfirmed Chromium
Historical mapped workings available
Valdor Dredge
California
Unconfirmed Gold