Puno for instance, grew out to become a city of 120,000 people, while its sewage systems can cope with only a third of that number. But not all contamination is as visible: in the Ramis river, a tributary that feeds into the lake on the northwest side, high levels of mercury have been found in the sediment, which probably stem from wildcat gold mining in the area.
http://www.aljazeera.com/indepth/features/2016/12/161215091923943.html
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