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Spatial Coverage
- Colorado8
- Alaska3
- California3
- United States3
- Alaska.2
- British Columbia2
- Cripple Creek (Colo.)2
- Cripple Creek Mining District (Colo.)2
- Kansas2
- Nevada2
- West (U.S.)2
- Yukon2
- 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
