1. Major Mining Districts 1851 - 1995 U.S. Department of the Interior U.S. Geological Survey Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

2. Major Mining Districts 1851 - 1860 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts U.S. Department of the Interior U.S. Geological Survey

3. Major Mining Districts 1861 - 1870 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

4. Major Mining Districts 1871 - 1880 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

5. Major Mining Districts 1881 - 1890 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

6. Major Mining Districts 1891 - 1900 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

7. Major Mining Districts 1901 - 1910 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

8. Major Mining Districts 1911 - 1920 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

9. Major Mining Districts 1921 - 1930 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

10. Major Mining Districts 1931 - 1940 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

11. Major Mining Districts 1941 - 1950 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

12. Major Mining Districts 1951 - 1960 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

13. Major Mining Districts 1961 - 1970 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

14. Major Mining Districts 1871 - 1980 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

15. Major Mining Districts 1981 - 1990 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

16. Major Mining Districts 1991 - 1995 Historic Trails Major Railroads Major Highways Areal extent of district boundaries Mining Districts

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