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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...
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