BLM maintains an inventory of known abandoned mine lands on public lands. Most of the sites are abandoned hardrock mines. As of April 9, 2008, the inventory contained over 12,200 sites and 49,000 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
							Remaining
	No Action	Completed	In Progress	Planned	Undetermined	Total	Sites
	Needed		(a)	(b)	(c)	Sites	(a+b+c)
AK	115	27	15	1	8	166	24
AZ	262	25	12	80	1,508	1,887	1,600
CA	4	44	30	27	356	461	413
CO	120	433	57	29	2,290	2,929	2,376
ID	17	56	26	61	467	627	554
MT	141	96	48	19	512	816	579
NM	10	35	10	0	546	601	556
NV	35	512	65	835	1,730	3,177	2,630
OR	0	9	4	0	31	44	35
SD	0	0	1	0	1	2	2
UT	0	2	78	0	405	485	483
WA	1	13	16	5	40	75	61
WY	0	0	9	0	925	934	934
Total	705	1,252	371	1,057	8,819	12,204	10,247
Source: BLM's AML Inventory System			as of 4/9/2008

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.

You can view the latest BLM AML spatial data at www.geocommunicator.gov.

FEATURE	Feature Count	Per Cent
CAVED ADIT/DECLINE/TUNNEL	190	0.4%
CAVED SHAFT/INCLINE/STOPE	70	0.1%
HIGH WALLS/PITS	3,300	6.7%
ILLEGAL DUMP - HAZARDOUS WASTE	1	0.0%
MINE/MINERAL PROCESSING MILL	14	0.0%
OPEN ADIT/DECLINE/TUNNEL	8,270	16.8%
OPEN SHAFT/INCLINE/STOPE	5,921	12.0%
OTHER	19,926	40.4%
REPOSITORY	14	0.0%
SPILLS (OTHER THAN PIPELINES)	1	0.0%
TAILINGS	506	1.0%
TANKS (ABOVE GROUND & UNDER GROUND)	1	0.0%
WASTE DUMP	11,162	22.6%
TOTAL	49,376	100.0%