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    a major source of air pollution from mercury, artisanal and small scale gold mining releases approximately 400 metric tons of airborne elemental mercury each year.

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    in benguet province, a group of miners have been using the mercury free gravity borax method (gbm) for gold extraction for decades. this method basically requires the same equipment as the amalgamation methods. however, after the rod milling, an ore concentrate holding the heavy minerals is produced by using a launder (gold sluice) and a gold

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