Metals and metalloids in primary gold mining districts of Western Bolivia: anthropogenic and natural sources |
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| Authors: | Ángel Faz Raúl Zornoza M Ángeles Muñoz José A Acosta |
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| Institution: | 1. Sustainable Use, Management, and Reclamation of Soil and Water Research Group, Department of Agrarian Science and Technology, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 52, 30203, Cartagena, Murcia, Spain
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| Abstract: | Topsoil and subsoil samples located adjacent and distant from the mining operations sites were collected. Most total metals showed no significant differences between topsoil and subsoil or proximity, suggesting that they derive from endogenous parent material. There was an increment in Hg in topsoils adjacent to the mining operation sites, indicating a deposition of Hg from the amalgamation areas. Higher values of total, extractable and soluble As were observed adjacent to the mining operation sites, probably related to the presence of residues, rich in arsenopyrite. Organic matter and clay contents control the concentrations of EDTA-extractable Cd and Zn, while soil acidity was associated with the behaviour of As, Hg and Cu. In contrast the concentration of EDTA-extractable Pb was directly affected by its total concentration. In general, soluble metals were highly independent, without significant correlations with any soil physical and chemical properties. |
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