Econ. Environ. Geol. 2004; 37(3): 291-301

Published online June 30, 2004

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

The Oxidation of Chalcopyrite and Geochemical Behavior of Heavy Metals in the Manjang Cu Mine

Pyeong-Koo Lee1, In-Gyeong Lee2, Sang-Hoon Choi2* and Ji-soo Kim2

1Div. of Geological & Environmental Harzards, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea

2Dept. of Earth and  Environmental science, Chungbuk National Univ., Cheongju 361-763, Korea

Correspondence to :

Sang-Hoon Choi

cshoon@chungbuk.ac.kr

Received: February 9, 2004; Accepted: May 17, 2004

Abstract

<p>In order to characterize weathering of chalcopyrite and behavior of dissolved metal ions in waste rocks from Manjang Cu mine, Mineralogical studies such as refractive microscope, XRD and SEM/EDS anlayses carried out. The weathering was mainly occurred in fractures and edge of the chalcopyrite within the mine waste rocks. The weathering process can be seen to reflect four stages based on the weathering degree of chalcopyrite. The main secondary minerals are goethite, covellite, aazurite, malachite and brochantite. Dissolved Cu and As were mainly absorbed Fe-hydroxide. Poorly crystalline Fe-oxide contains relatively high as contents. In oxdizing condition, the weathering of chalcopyrite mainly occurs along the fracture, while the replacement of chalcopyrite observed mainly in the grain and produced covellite and brochantite. The dissolved metals (Cu, Fe, As) in waste rocks from the abandoned Manjang mine area could attenuate naturally by precipitation, adsorption and replacement reaction.

Keywords chalcopyrite, secondary mineral, adsorption, precipitation, replacement

Article

Econ. Environ. Geol. 2004; 37(3): 291-301

Published online June 30, 2004

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

The Oxidation of Chalcopyrite and Geochemical Behavior of Heavy Metals in the Manjang Cu Mine

Pyeong-Koo Lee1, In-Gyeong Lee2, Sang-Hoon Choi2* and Ji-soo Kim2

1Div. of Geological & Environmental Harzards, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea

2Dept. of Earth and  Environmental science, Chungbuk National Univ., Cheongju 361-763, Korea

Correspondence to:

Sang-Hoon Choi

cshoon@chungbuk.ac.kr

Received: February 9, 2004; Accepted: May 17, 2004

Abstract

In order to characterize weathering of chalcopyrite and behavior of dissolved metal ions in waste rocks from Manjang Cu mine, Mineralogical studies such as refractive microscope, XRD and SEM/EDS anlayses carried out. The weathering was mainly occurred in fractures and edge of the chalcopyrite within the mine waste rocks. The weathering process can be seen to reflect four stages based on the weathering degree of chalcopyrite. The main secondary minerals are goethite, covellite, aazurite, malachite and brochantite. Dissolved Cu and As were mainly absorbed Fe-hydroxide. Poorly crystalline Fe-oxide contains relatively high as contents. In oxdizing condition, the weathering of chalcopyrite mainly occurs along the fracture, while the replacement of chalcopyrite observed mainly in the grain and produced covellite and brochantite. The dissolved metals (Cu, Fe, As) in waste rocks from the abandoned Manjang mine area could attenuate naturally by precipitation, adsorption and replacement reaction.

Keywords chalcopyrite, secondary mineral, adsorption, precipitation, replacement

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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