Artisanal miners don’t exploit large veins of gold, instead collecting gold flakes from throughout the rainforest by stripping the land of trees or scooping up river sediment, then using toxic mercury to extract the precious metal. Though the environmental damage done by artisanal miners is extensive, it is also hard to detect remotely — the miners leave behind a barren landscape of mercury-polluted ponds and sand dunes, which can resemble a natural wetlands environment when viewed via satellite imagery.
read more/// https://news.mongabay.com/2018/11/novel-research-method-reveals-small-scale-gold-minings-impact-on-peruvian-amazon/
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