Region
Alaska
30
Colorado
25
New Mexico
12
United States
12
Denver Basin
7
Utah
7
Arizona
6
Nevada
6
Canada
5
Idaho
5
Oregon
5
West (U.S.)
5
Montana
4
Wyoming
4
Afghanistan
3
Australia
3
Larimer County
3
Wisconsin
3
Aniak
2
Aniak (Alaska)
2
Armenia (Republic)
2
Black Hills (S.D. and Wyo.)
2
California
2
California, Northern
2
Chile
2
Chugach National Forest
2
Coeur d'Alene Mining District
2
Colorado Plateau
2
Delta River
2
Delta River (Alaska)
2
Florida
2
India
2
Jefferson County
2
Kentucky
2
Medford Region
2
Merry Widow Mine (N.M.)
2
Middle Atlantic States
2
Pennsylvania
2
San Juan County
2
San Miguel County
2
South Australia
2
Umpqua National Forest
2
Admiralty Island
1
Admiralty Island (Alaska)
1
Aisén (Province)
1
Alaska, Gulf of
1
Alaska, Southeast
1
Bering Sea
1
Black Ridge Canyon (Colo.)
1
British Columbia
1
more ...