Colombia’s gold bonanza has a dark side, U.N. experts said on Tuesday: mercury poisoning spreading from miners to the population of a northwest state where they use mercury to extract the precious metal.Colombia is one of the world’s top mercury polluters, as 50 to 100 metric tons of mercury are lost annually in the process of capturing gold while soaring prices push miners and artisans to extract ever more of the yellow metal, analysts say.”
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