Abandoned Mine Lands Inventory

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BLM maintains an inventory of known abandoned mine lands on public lands. Most of the sites are abandoned hardrock mines. As of January 2, 2015, the inventory contained over 48,100 sites and 89,500 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 (01/02/2015)      
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 to be addressed(C+D+E+G)

Alaska

22

9

14

1

77

91

5

219

97

Arizona

204

330

32

217

3,798

983

665

6,229

4,712

California

142

 1

34

9

1,048

138

324

1,696

1,415

Colorado

737

 1

18

46

2,041

444

113

3,400

2,278

Idaho

267

 23

39

201

157

474

303

1,464

700

Montana

387

 2

65

 1

543

212

21

1,231

630

Nevada

634

 219

56

 5

15,631

45

700

17,290

16,392

New Mexico

705

 

8

 

8,956

30

377

10,176

9,341

Oregon

27

 

7

 19

702

38

7

800

735

Utah

2,234

 2

450

 5

620

1,207

13

4,531

1,088

Washington

3

 

5

 

61

24

8

101

74

Wyoming

44

11

1

 78

907

24

24

1,089

1,010

Total:

5,406

598

729

729

34,541

3,710

2,560

48,12638,412

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 consistently 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 Features Inventory
Abandoned Mine Land Feature Types* as of 01/02/2015

Feature TypeNumber% of 
total
Remaining features to be addressed
Adit caved2,8113%1,361
Adit open18,85021%15,555
Heap leach90%7
Highwalls/Pits8,0579%7,434
Mine/Mineral Processing Mill2900%214
Other20,04222%15,774
Prospect Pit5,4996%2,709
Repository240%10
Reserve Pits/PWP/Other Waste750%51
Shaft caved1,1411%647
Shaft open20,29923%17,145
Tailings5111%452
Waste Rock Dump11,90313%8,474
Total:89,511100.0%69,833
*Source: BLM's Abandoned Mine Lands/site Cleanup Inventory Database