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Geochemistry and mineralogy of Cu and Co in mine tailings at the Copperbelt, Zambia by O. Sracek; M. Mihaljevič; B. Kříbek; V. Majer; F. Veselovský is a Earth and Planetary Sciences article available to read on EtoBox.

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Two sulfidic mine tailings within the Zambian Copperbelt in the north of Zambia have been studied: Chambishi, representing an old site (age about 40 y) and Mindolo, which represents a relatively recent site (age less than 10 y). The neutralization capacity based on solid phase carbonates at both sites remains high, thus neutral to alkaline conditions (paste pH up to 8.5 at Chambishi and up to 6.9 at Mindolo) predominate. Pore water at Chambishi has 568 mg/l of Ca and 1820 mg/l of sulfate, but concentrations of Fe and Mn are below 0.1 mg/l and concentrations of Cu and Co are below 0.05 mg/l. The principal secondary minerals at both sites are gypsum, poorly crystalline Fe(III) phases and hematite. Secondary Fe(III) phases are found as mineral coatings or completely replaced primary sulfides like pyrite and chalcopyrite and include large quantities of copper and cobalt in surface rims (up to 7.0 wt.% of Cu and up to 2.0 wt.% of Co). The presence of Fe(III) phases is marked by red color of mine tailings material, which is observed even below the expected penetration of the sulfide oxidation front. This may be explained by reductive dissolution of Fe(III) phases caused by flooding of ta

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Author

O. Sracek; M. Mihaljevič; B. Kříbek; V. Majer; F. Veselovský

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 1464-343X)

Published

2010

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)