Estimate by the Government Accountability Office of the number of abandoned hardrock mines and hazards by state:
Alaska
Mine sites: 469
Unsafe features: 235
Sites with environmental degradation: 99
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Arizona
Mine sites: 50,000
Unsafe features: 59,400
Sites with environmental degradation: 9,900
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California
Mine sites: 47,084
Unsafe features: 164,795
Sites with environmental degradation: 5,200
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Colorado
Mine sites: 7,300
Unsafe features: 17,000
Sites with environmental degradation: 150
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Idaho
Mine sites: 7,100
Unsafe features: N/A
Sites with environmental degradation: N/A
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Montana
Mine sites: 6,000
Unsafe features: 6,000-22,000
Sites with environmental degradation: 331
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Nevada
Mine sites: 16,000
Unsafe features: 51,000
Sites with environmental degradation: 150
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New Mexico
Mine sites: 800
Unsafe features: 15,000
Sites with environmental degradation: 200-300
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Oregon
Mine sites: 3,823
Unsafe features: N/A
Sites with environmental degradation: 140
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South Dakota
Mine sites: 950
Unsafe features: N/A
Sites with environmental degradation: N/A
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Utah
Mine sites: 17,000
Unsafe features: 17,000
Sites with environmental degradation: 17,000
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Washington
Mine sites: 3,629
Unsafe features: 1,608
Sites with environmental degradation: 50
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Wyoming
Mine sites: 956
Unsafe features: 519
Sites with environmental degradation: 437
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