Spatial Coverage
- Fraser River (B.C.)2
- Gilpin County2
- Idaho2
- Montana2
- Oregon2
- Transvaal (South Africa)2
- Africa, Southern1
- Alabama1
- Arequa (Colo.)1
- Atlin Lake (B.C.)1
- Australia1
- Beaufort (N.C.)1
- Beaufort.1
- Black Hills (S.D. and Wyo.)1
- Black Hills.1
- Bullfrog Mining District (Nev.)1
- Central City1
- Central City.1
- Central Region (Malawi)1
- Colorado.1
