BLM maintains an inventory of known abandoned mine lands on public lands. Most of the sites are abandoned hardrock mines. As of February 28, 2011, the inventory contained nearly 31,000 sites and 65,000 features. Approximately 25% of the sites have either been remediated, have reclamation actions planned or underway, or do not require further action.  The remaining 75% require further investigation and/or remediation.  

Abandoned Mine Lands Site Status (02/28/2011)
Geographic State	Completed (A)	No Action (B)	In Progress (C)	Needs Analysis (D)	Planned (E)	Final Closeout (F)	Maintenance and Monitoring (G)	Total:	Remaining Sites (C+D+E+F+G)
Alaska	45	115	19	21	37		1	238	78
Arizona	180	347	22	2538	134	17		3238	2711
California	130	100	46	1319	362			1957	1727
Colorado	665	216	51	2204	163			3299	2418
Idaho	481	259	49	235	218		3	1245	505
Montana	305	224	183	442	43			1197	668
Nevada	1122	39	60	10324	818	2		12365	11204
New Mexico	122	10	15	1560	63			1770	1638
Oregon	118	3	190	140	10			461	340
South Dakota	4							4
Utah	2483	891	231	466	21			4092	718
Washington	13	1	16	56	8			94	80
Wyoming	10	6	5	1016	7			1044	1028
Others	5	1		1	3			10	4
Total:	5683	2212	887	20322	1887	19	4	31014	23119

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.

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