Tumbling inside these steel cylinders are gold ores laced with mercury to coax the precious metal from the ore. The resulting amalgam is then heated to finally extract the gold granules, a process that sends mercury fumes wafting out of the ball mill facilities and into every nook and cranny of the cramped shanty town.
http://www.philippines-travels.com/blog/2016/05/12/mining-and-mercury-in-mount-diwata-today/
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