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a quot refractory quot gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals these ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes these

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4 32 cornstarch replaces cyanide in clean new gold extraction method scientists accidentally discover a new way to isolate gold that is much safer than existing processes which use toxic cyanide by rebecca boyle posted

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9 32 many artisanal and small-scale miners are achieving high rates of gold recovery without mercury benefiting their health the health of their communities and the environment on this page we summarize some of the

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9 32 many artisanal and small-scale miners are achieving high rates of gold recovery without mercury benefiting their health the health of their communities and the environment on this page we summarize some of the

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