The matting is rinsed in a basin of water to extract the gold, and then a
few drops of mercury are added to the basin, where they combine with
the gold to form a liquid lump at the bottom. Getting the "amalgam" out
of the basin involves slowly sluicing out the water and silt to leave
just the gold and mercury. This is a process which traditionally has
been done in the local river, where the mercury can escape and pollute
the water and environment.
http://www.westerndailypress.co.uk/Danger-methods-mining-harm-planet/story-25787066-detail/story.html
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