One of the main concerns is mercury and its highly toxic cousin methylmercury. Gold miners sometimes use mercury to separate their gold ore from soil and sediments, often without adequate safety precautions. The mercury, itself a potent neurotoxin, seeps into ponds and can then be converted into the super-toxic chemical methylmercury through microbial processes.
read more... https://www.iflscience.com/gold-glitters-in-the-forest-of-peru-in-a-photo-taken-by-an-astronaut-68359
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