Kofi Osei runs one such cleaning shed and the methods he uses have
barely changed in hundreds of years - he pans the soil with water and
the heavier gold falls to the bottom.
He then uses mercury to bind the tiny gold deposits together
and squeezes the combination through a cloth to leave a small, dull
rock.
This is then roasted to remove the excess mercury - it's a
dangerous process as the mercury fumes are highly toxic - and a shiny
gold nugget is born.
http://www.bbc.co.uk/news/business-25417492
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