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用铅－锌硫化矿浮选尾矿进行了生物浸出回收金和银的研究。以硫脲作为浸出剂代替传统的氰化物。如果直接用硫脲浸出其金和银的回收率仅２３％和４５％，而用细菌浸出的残渣再用硫脲浸出，其结果金和银的回收率可达到９２％和７８％。噬硫杆菌含铁氧化剂硫脲溶解细菌的耐受度和其它试验表明，用混合生物法，预先氧化硫脲浸出对从低品位硫化矿资源中提取金和银是切实可行的。
The leaching of gold and silver by bioleaching with lead-zinc sulphide flotation tailings was carried out. Thiourea as a leaching agent instead of the traditional cyanide. If the direct thiourea leaching gold and silver recovery rate of only 23% and 45%, and leaching residues with bacterial leaching with thiourea, the results of gold and silver recovery rate of up to 92% and 78%. Thiobacillus thiobacteria ferrous thiourea-solubilizing bacteria tolerance and other tests show that the mixed biological method, the pre-oxidation of thiourea extraction of low-grade sulfide ore from the extraction of gold and silver is feasible.