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influence of mining activities in the north of potosi, bolivia on the water quality of the chayanta river, and its consequences.mining activity in the north of potosi (siglo xx mine, ingenio catavi-siglo xx, pucro mine and colquechaca mine) produces minewater containing high concentrations of heavy metals such as as (0.02-34 mg/l), cd (45-11,600 microg/l), cu (0.35-32 mg/l), fe (42-1,010 mg/l), pb(33-3,130 microg/l), ni(20-4,320 microg/l), and zn (1.1-485 mg/l), that exceed considerably the limit values. the rivers in the north of potosi (katiri and pongoma) that do not receive minewater contain clear water with rather l ...200717171242
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