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Leoncio Na-Oy provides training in the borax method of gold extraction. Keywords. Borax, sodium borate, Philippines, pollution, health, gold mining, mercury, artisanal, small-scale mining, whole-ore amalgamation, heavy mineral amalgamation. J Health Pollution 35-10 2012 The Borax Method of Gold Extraction for Small-Scale Miners. Peter W.U.
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