Rio Tinto river, Huelva, Spain. As a possible result of the mining, Río Tinto is notable for being very acidic (pH 2) a…
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Rio Tinto river, Huelva, Spain. As a possible result of the mining, Río Tinto is notable for being very acidic (pH 2) and its deep reddish hue is due to iron and copper dissolved in the water.