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The biological leaching of an auriferous pyrite ore |
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| Authors: | Marja Riekkola-Vanhanen PhLic Seppo Heimala DSc Carita A Sivelä MSc Felipe Viguera MSc Irma Varjola MSc Seppo I Niemelä PhD Olli H Tuovinen PhD |
| Affiliation: | 1. Outokumpu Research Oy, Pori, Finland 2. University of Helsinki, Finland 3. Outokumpu Tecnica Chile, Chile 4. Ohio State University, USA |
| Abstract: | The oxidation of an auriferous pyrite ore sample was evaluated in biological leaching experiments for subsequent gold recovery via cyanidation. In batch cultures, organisms derived from the mine site oxidized pyrite and ferrous iron at pH values as low as pH 0.6. The recovery of gold was variable in shake flask experiments. In stirred tank bioreactor leaching, gold recovery was proportional to the extent of iron dissolution by bioleaching. The leaching of arsenic from the sample was also directly proportional to iron dissolution. |
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