Outpost Mine
Arizona
Unconfirmed Bismuth
Documented adit evidence
Tantalum underground mines
Catalog records where USGS source data lists Tantalum 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
Picacho View
Arizona
Unconfirmed Niobium (Columbium)
Documented adit evidence
Picacho View Mine
Arizona
Unconfirmed Feldspar
Historical mapped workings available