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Coordinates: 38°59′N 119°12′W / 38.983°N 119.2°W / 38.983; -119.2 Anaconda Mine Anaconda Copper Mine. Inactive since 1978, the pit has flooded. Location Anaconda Copper Mine (Nevada) (Nevada) Location Lyon County State Nevada Country United States Owner Company ARCO (current) Anaconda Copper (when in operation) Year of acquisition 1953 (by Anaconda Copper) Production Products Copper Production 360 million tons Combined ore and waste Financial year Life of Mine History Opened 1918 (as Empire Mine) 1953 (as Anaconda Copper Mine) Closed 1978 This article is about the copper mine in Nevada. For the copper mine in Montana, see Anaconda Copper Mine (Montana). The Anaconda Copper Mine is an open pit copper mine in Lyon County, Nevada that was owned and operated by the Anaconda Mining Company. It is located adjacent to the town of Yerington. The company town of Weed Heights was built to support the mining operation which ran until 1978.[1] Contents 1 History 2 Production 3 Environmental issues 4 External links 5 References // History The Anaconda Mine first opened in 1918 as the Empire Nevada Mine. In 1953 the property was acquired by the Anaconda Copper Company,which ran the mine until Anaconda was taken over by Atlantic Richfield Company.[2] Atlantic Richfield ceased operations in 1978 due to a low copper prices, lower priced foreign imports of copper and declining grade and resources in the pit.[3] The property was sold in 1982 to Don Tibbals[3], a Lyon County commissioner.[4] The land was subsequently resold to Arimetco, with the exception of Weed Heights.[2] Production The Anaconda mine operated for 25 years and produced approximately 360 million tons of material from the pit. Most of the material remains in tailings or in leach heap piles. The copper was processed from the extracted ore using two processes. Copper oxide ore (from the upper portion of the pit) was processed by heap leaching, either directly with sulfuric acid in vats to produce a copper solution precipitated by passing it over scrap iron, or by leaching successively in acid and kerosene solutions, subsequently electroplating onto stainless steel sheets. Copper sulfide ore from the lower portion of the pit was processed by crushing, and flotation with calcium oxide added to the solution to maintain an alkaline pH.[2] Environmental issues The mining wastes at the closed mining site have been investigated by the U.S. Environmental Protection Agency‎. Since 2000, it has spent approximately $6 million addressing this issue and ARCO has spent $2.7 million to clean the site.[3] In 2009 ARCO committed to spending $10.2 million for future and past cleanup work. Of the $10.2 million, $8 million is for future work and $2.2 million is to reimburse the EPA for past work completed. In 2008 ARCO reimbursed the EPA $2.7 million.[5] External links Anaconda mine - EPA References ^ Stark, Sandra (March 23, 2000). "Where Am I?". Pahrump Valley Gazette: p. 2. http://news.google.com/newspapers?id=ALIMAAAAIBAJ&sjid=PGQDAAAAIBAJ&pg=1983,1678262&dq=weed-heights. Retrieved February 11, 2009.  ^ a b c "Health Consultation". U.S. Department of Health and Human Services. August 22, 2006. p. 3. http://www.atsdr.cdc.gov/hac/pha/yerington_anaconda_nevada/YeringtonAnacondaMineHC082206.pdf. Retrieved 2009-03-23.  ^ a b c "ARCO Pays $2.7 Million to Contain Waste at Old Copper Mine". Environment News Service. June 29, 2008. http://www.ens-newswire.com/ens/jun2008/2008-06-29-094.asp.  ^ "Lyon County Board of Commissioners". http://www.lyon-county.org/index.asp?NID=205. Retrieved 2009-03-23.  ^ "EPA: ARCO to Spend $10.2M for NV Mine Cleanup". KOLO TV (ABC). http://www.kolotv.com/news/headlines/43480002.html. Retrieved 2009-04-23.  The abandoned processing facilities at the Anaconda Copper Mine