FIELD: precious metal technology. SUBSTANCE: to prepare high-purity gold of 99.99%, gold extraction and reextraction processes are simultaneously conducted in extraction membrane: aqueous phase 1 (initial solution) organic phase (tributyl phosphate solution) - aqueous phase 2 (mineral acid solution). According to invention, aqueous phase 2 is kept at 30 to 70 C. Gold is concentrated in aqueous phase 2. Subsequent isolation of metal is accomplished involving known techniques. EFFECT: simplified procedure and allowed concentration of gold in reextraction stage. 2 cl, 1 tbl, 2 ex
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