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CISITU, Indonesia — In the remote mountains of West Java, workers like 15-year-old David Mario Chandra are an integral part of Indonesia’s gold industry.

A workshop next to his family’s house in Cisitu, in Banten Province, contains machinery that turns gold ore into usable nuggets. The procedure seems simple enough: The crushed ore is tumbled with other ingredients in cylinders called balls until the valuable stuff is amalgamated. But there is a crucial material — and a final step — that alarms environmental and health experts around the world.

Read more at: http://www.nytimes.com/2014/01/03/business/international/small-scale-gold-mining-pollutes-indonesian-lands.html?_r=0