Recovery of Silver, Gold, and Lead From a Complex Sulfide ...
cover gold, silver, and byproduct lead from a complex lead zinc sulfide ore. A ferric chloride preleach, at 40° C in 6 h, extracted about 50 pct of the zinc and formed insoluble silver and lead chlorides. Subsequent acid thiourea leaching, for 1 to 3 h at 40° C, extracted