Abstract
The 7-year-old mine tailings pile P2 from Concepción del Oro has been revegetated spontaneously by xerophyte grasses, covering about the 30% of its surface. To elucidate the effect of the grass cover in the geochemical behavior of the sulfide minerals (SM) and metals, the strata of four selected profiles (P2-I, P2-II, P2-III and P2-IV, with high, middle, low, and null grass cover, respectively) were analyzed mineralogically and chemically, using scanner electron microscopy, X-ray diffractometer and performing a six-step sequential extraction method. An older (50-year-old) and uncovered (without grass cover) profile of the tailings pile P3 was also analyzed. In all the profiles from P2, the SM oxidation is not yet an extended process; however, the samples from the uncovered profile P2-IV showed evidences of SM (pyrite and chalcocite) oxidation, as well as the presence of gypsum and Fe oxides, as the major secondary phases resulted from the SM oxidation. Additionally, the carbonate content and pH values in P2-IV were lower than in the covered profiles from P2. The oldest and uncovered P3-I profile showed an extensive oxidation of sulfurs which resulted in the depletion of carbonates and a pH 2. Another distinctive characteristics of the covered profiles was that Pb, Cu, and Zn were mainly associated with the reducible fractions (carbonates and/or amorphous oxides); meanwhile, in the uncovered (P2-IV and P3-I) such metals were mainly associated with the oxidizable fraction (crystalline oxides). The results suggest that the mineralogical transformations control metal stability in plant-covered impoundments (phytostabilization): the occurrence of a thick grass cover, with an efficient water usage and retention, seems to shun both the acidic dissolution of carbonates and the reductive dissociation of the formerly present oxyhydroxides, which is desired for remediation tasks. This is the first report about the effects of grass cover for a carbonaceous and unsaturated mine tailings from a semiarid region, that can help in a better understanding of the scope of phytoremediation in such conditions.
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Acknowledgments
The authors are grateful to Ms. Nubia Arteaga for X-ray diffraction and SEM analyses of mine tailings, and to Dr. Hugo García Martínez for the samples collected. To the reviewers for carefully corrected the manuscript and stringently pointing out its weaknesses. The project was financed by CONACYT-SEMARNAT (2004-01-C01-00170).
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Figueroa, F., Castro-Larragoitia, J., Aragón, A. et al. Grass cover density and metal speciation in profiles of a tailings-pile from a mining zones in Zacatecas, North-Central Mexico. Environ Earth Sci 60, 395–407 (2010). https://doi.org/10.1007/s12665-009-0183-5
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DOI: https://doi.org/10.1007/s12665-009-0183-5