Various studies have shown that in recent years the waste from mining activities in the Zaruma area in Ecuador has contaminated the entire Puyango-Tumbes river basin in both countries. The analysis found toxic levels of lead, arsenic, cyanide and mercury, among other chemicals and heavy metals, in the water.
read more... https://www.fairplanet.org/story/how-a-sinking-gold-town-in-ecuador-is-contaminating-a-peruvian-river/
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