Lyon County Economic Development and Environmental Remediation Act This bill directs the Department of the Interior to convey to Atlantic Richfield Company all right, title, and interest (including miner rights) of the United States in and to approximately 2,062 acres of five parcels of land managed by the Bureau of Land Management and located in Lyon County, Nevada. This conveyance is for the purpose of remediation and reclamation of abandoned copper mines on the land and economic development in the county.