Assertion: elevated arsenic | /r/AtLocation | la oroya
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Source sentences:
text: A study performed in the Rímac river basin showed that mine tailings resulted in elevated arsenic, copper and lead concentrations in the river and its tributaries.15 Consistent with this finding, elevated arsenic in drinking water was also found in La Oroya, a small industrial town that had a smelter for processing copper, zinc and lead.16