Region
Wisconsin
16
Colorado
12
Missouri
11
Nevada
11
United States
10
Idaho
9
California
7
Illinois
7
Mississippi River Valley
7
Oklahoma
7
Utah
6
Arizona
5
New Mexico
5
Clark County
4
Grant County
4
Lafayette County
4
Montana
4
Washington (State)
4
Coeur d'Alene Mining District
3
Iowa County
3
Kansas
3
Ottawa County
3
Tennessee
3
Arkansas
2
Christian County
2
Jo Daviess County
2
Maine
2
New Hampshire
2
New York (State)
2
Peru
2
Pitkin County
2
San Bernardino County
2
Shoshone County
2
Stevens County
2
Tennessee, East
2
Tooele County
2
Virginia
2
Alabama
1
Alaska
1
Alice Mine (Mo.)
1
Amador County
1
Appalachian Region, Southern
1
Beaver County
1
British Columbia
1
Butte
1
Butte County
1
Calaveras County
1
Cascade County
1
Chaffee County
1
Cherokee County
1
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