An experiment conducted by Veiga et al. (2009) demonstrated to Ecuadorian miners that amalgamation extracted only 26% of the gold from a gravity concentrate, whereas cyanidation extracted more than 90%. The low efficiency of gold extraction was attributed to the oxidation of the mercury. Pantoja and Alvarez (2000) recommended using an electrolytic process to remove mercury oxidation .
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Less mercury, more gold and better health (Gold in a shop in Kalimantan, Indonesia) Manual for Training Artisanal and Small-Scale Gold Miners/Veiga, M.M. et al./Vienna, Austria: GEF/UNDP/UNIDO, 2006, 144p. 1. mercury pollution, 2. artisanal gold mining, 3. gold processing.
Gold is often trapped as fine grains within larger grains of heavy minerals.7 With the local amalgamation method, the fine gold is not liberated. To liberate the fine-grained gold, the heavy mineral concentrate is ground in the washing pan with a rock. The concentrate with a high proportion of gold is then mixed with borax in a small plastic bag.
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