Abandoned Mine Lands Inventory

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Map of Known BLM AML Sites in Western USMap of Known BLM AML Sites in Alaska

BLM maintains an inventory of known abandoned mine lands on public lands. Most of the sites are abandoned hardrock mines. As of January 30, 2014, the inventory contained over 44,000 sites and 84,600 features. Approximately 20% of the sites have either been remediated, have reclamation actions planned or underway, or do not require further action.  The remaining 80% require further investigation and/or remediation.  

Abandoned Mine Lands Site Status (01/30/2014)      
Geographic StateAction Completed
(A)
Final
Closeout(B)
In
Progress (C)
Maintenance
and 
Monitoring(D)
Needs Analysis
(E)
No
Action
(F)
Planned
(G)
Total:Remaining Sites (C+D+E+G)

Alaska

22

7

12

 2

77

92

5

217

96

Arizona

196

255

22

167

2,681

876

243

4,440

3,113

California

136

 1

33

9

1,049

137

326

1,691

1,417

Colorado

722

 1

18

10

2,158

372

100

3,381

2,286

Idaho

264

 22

38

195

165

310

221

1,215

619

Montana

368

 2

57

 1

551

209

20

1,208

629

Nevada

634

 219

56

 5

14,723

44

699

16,380

15,483

New Mexico

540

 

12

 

8,429

23

386

9,390

8,827

Oregon

27

 

 6

 19

675

35

7

769

707

Utah

2,234

 2

 450

 4

620

1,207

12

4,529

1,086

Washington

3

 

 5

 

61

24

8

101

74

Wyoming

47

11

 2

 23

964

28

16

1,091

1,005

Total:

5,193

520

711

435

32,153

3,357

2,043

44,41235,342

Abandoned Mine Land site status as of January 30,2014
Source: BLM's AML inventory database.

*This data should be considered soft because the BLM is currently reviewing and updating its data. In addition, the majority of sites were reported during the initial inventory efforts from various sources, but have not been assessed on the ground by the BLM.

Abandoned Mine Site Features Inventory 

Abandoned Mine Land Feature Types  
As of 01/30/2014  
Feature TypeNumber% of 
total
Adit caved2,4883%
Adit open18,14122%
Heap leach90%
Highwalls/Pits7,6855%
Mine/Mineral Processing Mill2790%
Other20,53824%
Prospect Pit3,5444%
Repository260%
Reserve Pits/PWP/Other Waste830%
Shaft caved1,0861%
Shaft open19,01323%
Tailings5301%
Waste Rock Dump10,95713%
Total:84,379100.0%
Source: BLM's Abandoned Mine Lands/site Cleanup Inventory Database