This study presents the novel idea of a cyanide-free leaching method, i.e., glycine-ammonia in presence permanganate, to treat low-grade and copper-bearing gold tailing. Ammonia played key role as pH modifier, lixiviant potential catalyst (as cupric ammine) this study. Replacing ammonia with other modifiers (i.e., sodium hydroxide or lime) made extractions infeasibly low (<30%). The increase...
