Most zama-zamas chip away at the gold-bearing reefs with small picks, while the better resourced use explosives. They load the ore into small back-packs and make their way to the surface, dodging the police to get the ore to the above-ground “refineries” where the ore is crushed and the gold extracted from the concentrate using mercury. The mercury is burned off, leaving a small nugget of gold.
read more... https://www.moneyweb.co.za/news/south-africa/the-most-dangerous-occupation-in-the-world/
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