The tumbler barrels are a micro version of the technique used by legitimate mines. Some of them are run by generators, while others use the power of the mountain rivers to turn the barrels.
Mercury and cyanide are added to extract the gold from the smashed rocks and gravel.
In the sprawling village, a fresh-faced man called Suhendar is one of the many gold buyers.
"The diggers come here to cash the gold," he said.
"They burn it here to purify it from the mercury and other chemicals. Then we flatten it with a hammer for easy handling and cleaning.
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