To improve the water quality of water flowing from the Leadville Mine Drainage Tunnel, Colorado, and of the Upper Arkansas River Basin, and for other purposes.

Authorizes the Secretary of the Interior to: (1) construct, operate, and maintain a water treatment plant for the Leadville Mine in Colorado; and (2) install concrete lining on the rehabilitated portion of the Leadville Mine Drainage Tunnel.

Specifies that: (1) such treatment plant shall be designed and constructed to treat the quantity and quality of effluent historically discharged from such Tunnel; and (2) construction, operation, and maintenance costs of the works authorized by this Act shall be nonreimbursable. Authorizes appropriations

Authorizes the Secretary to formulate and implement a program for the restoration of fish and wildlife resources of those portions of the Arkansas River Basin affected by the effluent discharged from the Tunnel. Requires the Secretary to submit a copy of the proposed program to the Congress.

Permits the Secretary to conduct investigations of water pollution sources and impacts attributed to mining and other development in the Upper Arkansas River Basin and to develop and implement corrective action demonstration projects for the Basin. Limits the Federal share of implementing such plans to 60 percent of the total cost.