Arsenic Liberation from Mine Wastes Derived of Skarn Deposits at Sierra Madre Oriental, México

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• 作者：Ramos-Arroyo Yann^a ; ^{yannramos2004@yahoo.com.mx} ; Guerrero-Aguilar Armando^a ; Cano-Rodr&iacute ; guez Irene^b ; Gutié ; rrez-Valtierra Moisé ; s^b ; Miranda Avilé ; s Raú ; l^a
• 关键词：Arsenic ; sulphides oxidation ; leachates liberation
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：833-836
• 全文大小：267 K
• 卷排序：17

文摘

This work focuses on the evaluation of magnitude of arsenic release into the Xichú River from mine wastes at La Aurora mine, located in Sierra Madre Oriental at Guanajuato state, Mexico. Approximately 1 million tons of sulfur-rich tailings were deposited on the banks of the river after the extraction and processing of skarn ore type deposits. A total of 47 water samples were collected and analyzed at field and by atomic absorption spectroscopy. All samples contain As, Cd, Cu, Fe, Mn, Pb and Zn product of sulphide oxidation at mine wastes. Chemical composition diagrams (Piper and Stiff) were created with the obtained data with the software AQUACHEM to visualize the impact of arsenic leaching in the Xichú basin. At the base of one deposit, a small, localized and continuous liberation of leachates occur, with very high quantities of arsenic in solution and associated to suspended particles. In aqueous phase, at least migrates 2 kg of arsenic per year and great quantities of iron and sulfates. The affectation level is controlled by seasonal conditions. Is possible find Mn in all the analyzed samples and it seems that arsenic liberated from mine wastes affect a great area. The in-situ formation of oxides and oxi-hydroxides favor arsenic retention.