Key West
Nevada
Unconfirmed Nickel
Documented shaft evidence
Osmium underground mines
Catalog records where USGS source data lists Osmium among mined commodities. Reported minerals on a mine page are tracked separately and are not the same as commodities.
- Underground mine records
- 3
- Independently verified
- 0
Representative records
Mann and Ross Mine
California
Unconfirmed Gold
Valdor Dredge
California
Unconfirmed Gold