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Secondary (Regenerative) Resources

     

A method for recovering precious metals from secondary (regenerative) resources, comprising or consisting of the following steps:

(a) Providing solid waste containing at least 0.0001% by weight (b.w.) of precious metals;

(b) Contacting said solid waste with heterotrophic microorganisms capable of producing and releasing hydrocyanic acid (HCN);

(c) Adding to the mixture obtained in step (b) a solvent or aqueous nutrient solution that serves as a nutrient source for said microorganisms;

(d) Depleting said waste of its contained precious metals through complexation between the metals and hydrocyanic acid released by said microorganisms;

(e) Separating the precious metal-depleted solid waste from the liquid bearing metal-cyanide complexes;

(f) Recovering the precious metals from the precious metal-cyanide complexes by methods known in the art.

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