ANACONDA COPPER MINE
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The Anaconda Copper Mine site covers more than 3,400 acres in the Mason Valley, near the city of Yerington, in Lyon County, central Nevada, approximately 65 miles southeast of Reno. The Singaste Range and the town of Weed Heights lie to the west, open agricultural fields and homes to the north, U.S. Bureau of Land Management (BLM) managed public land to the south, and the Walker River and the city of Yerington to the east. Portions of the site formerly owned by Arimetco were acquired by Singatse Peak Services and portions are BLM managed public lands.
What Has Been Done to Clean Up the Site?
NDEP and EPA have taken several emergency removal actions at the site to address immediate concerns, and have required ARC to begin remedial investigations and feasibility studies to determine the extent of contamination and potential cleanup options for the site. EPA has completed a remedial investigation and feasibility study of the Arimetco portions of the site.
What Is the Current Site Status?
EPA established eight Operable Units (OUs) to address the investigation and cleanup of the various components of the site: Site-Wide Groundwater (OU-1), Pit Lake (OU-2), Process Areas (OU-3), Evaporation Ponds/Sulfide Tailings (OU-4), Waste Rock Areas (OU-5), Oxide Tailings (OU-6), Wabuska Drain (OU-7), and Arimetco (OU-8).
Each of these OUs has their own investigation and will have their own cleanup plans. The cleanup approaches for the various hazards at the site will be determined after each investigation has been completed and potential risks have been evaluated. In the interim, Now that the bulk of the site has been deferred to the State of Nevada, the Nevada Division of Environmental Protection will determine whether emergency removals or other interim actions are warranted to mitigate immediate hazards on non tribal lands. EPA will continue to determine whether emergency removals or other interim actions are warranted to mitigate immediate hazards on tribal lands..