“We put 15 kilograms of gold ore and water into each ball, and we use
100 grams of mercury per ball,” or 3.5 ounces for 33 pounds of ore,
said David, who runs the family’s workshop. Workers then purify the
nuggets using an open flame, burning off the mercury in sites among
residential areas throughout the village.
Yuyun Ismawati, an environmental campaigner based in Britain, says
the scope of the problem is evident in the amount of mercury being
exported from around the world to Indonesia, her home country. Most of
it, she says, is brought in illegally.
http://www.silvergoldforum.com/topic/small-scale-gold-mining-killing-indonesia/
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