Region
Colorado
24
Alaska
12
New Mexico
10
United States
7
Utah
7
Arizona
5
Canada
5
West (U.S.)
4
Wyoming
4
Australia
3
Larimer County
3
Montana
3
Nevada
3
Chile
2
Florida
2
Idaho
2
Jefferson County
2
Merry Widow Mine (N.M.)
2
Oregon
2
Pennsylvania
2
San Juan County
2
San Miguel County
2
South Australia
2
Wisconsin
2
Aisén (Province)
1
Black Hills (S.D. and Wyo.)
1
Black Ridge Canyon (Colo.)
1
Bull Mountain Region
1
California
1
California, Northern
1
Catron County
1
Chugach National Forest
1
Coeur d'Alene Mining District
1
Colfax County
1
Colorado Plateau
1
Cordilleran area
1
Crede (Colo.)
1
Dolores River Canyon Wilderness
1
Dominguez Canyon (Colo.)
1
Fairbanks Region
1
Georgia
1
Gila County
1
Great Divide Basin
1
Illinois
1
Illinois Basin
1
Jakolof Bay region
1
Kanuti River Region
1
Kentucky
1
Lafayette County
1
Lehigh County
1
more ...