Abstract
The study described herein concerns the application of selective extraction techniques on metal-bearing phases identified in gossan samples. Specifically, the study is directed towards the detection of Zn- and Pb-bearing phases in Balsa-Portel area (southern Portugal). In order to identify the metal-bearing phases, samples were submitted to sequential extraction procedures using the following reagents: NH 4 acetate; hydroxylamine hydrochloride; oxalate in darkness; H 2O 2; oxalate under UV irradiation; and finally, mixed acids (HCl–HNO 3–HF). In the Balsa-Portel area, the Zn- and Pb-bearing phases generally occurring in the gossan samples are lepidocrocite, Mn-oxides, cerussite and smithsonite, dissolved by oxalate under UV irradiation (lepidocrocite), hydroxylamine hydrochloride (Mn-oxides) and ammonium acetate (cerussite and smithsonite).
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