But to get even an ounce of that gold, miners have to upend tons of river sediment. They pump a continuous slurry of sediment and river water over mats that trap minute fractions of gold-enriched dust, discharging their tailings back into the river.
Periodically, the accumulated gold dust is separated, and the gold isolated by amalgamating it with mercury. Invariably, the mercury is burned off into the atmosphere or, like the tailings, poured into waterways. Over 1,000 tons of mercury is dumped or burned off annually, and several large rivers have been so exhaustively mined that they simply disappear into vast mud pits that make parts of the Amazon look like the Somme.
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