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A detailed study of the weathering products is an important step toward the comprehension of the complex processes opera ting in the environment of mine tailings. The identification of the carriers of the polluta nts is a prerequisite for the assessment of the contamination risk and a remediation or immobilization strategy. In this study, we describe sulfide oxidation processes and the resulting chemical composition of the weathering products within 2 tailing impoundme nts rich in Fe, Ca, Si, Ba and Al. Content of...