Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly composed of gold, pyrite, galena, and chalcopyrite. Eight bacterial strains were successfully isolated from brine. Those strains were incubated in a liquid culture medium containing ore with a gold content of 0.26 wt.% and pulp density of 3.3 w/v% to evaluate their abilities to mediate the dissolution of gold. The gold was solubilised completely within 30 days of incubation in the iodine-iodide lixiviant solution generated by three bacterial strains. One strain, in particular, completed the dissolution of gold within 5 days of incubation and was identified as a member of the genus Roseovarius. Thus, the possibility of bacterial gold leaching using iodide-oxidising bacteria was successfully demonstrated. Bioleaching gold with iodide would likely be more environmentally sustainable than traditional cyanide leaching. Further research is required to evaluate the techno-economic feasibility of this approach.
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机译：使用碘-碘混合物从矿石中浸出金是氰化金的替代方法。这项研究评估了碘化物氧化细菌从主要由金，黄铁矿，方铅矿和黄铜矿组成的矿石中溶解金的能力。从盐水中成功分离出八株细菌。这些菌株在含有金含量为0.26 wt。％，矿浆密度为3.3 w / v％的矿石的液体培养基中孵育，以评估其介导金溶解的能力。在由三种细菌菌株产生的碘-碘化物浸滤剂溶液中孵育后的30天内，将金完全溶解。特别地，一种菌株在温育的5天内完成了金的溶解，并且被鉴定为玫瑰迷迭香属的成员。因此，成功地证明了使用碘化物氧化细菌浸出细菌金的可能性。与传统的氰化物浸提法相比，用碘化物生物浸提金在环境方面更具可持续性。需要进一步的研究来评估这种方法的技术经济可行性。
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