'Acid drainage, Argentina'

'Acid drainage, Argentina'

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Credit: W K FLETCHER/SCIENCE PHOTO LIBRARY

Caption: The confluence of a near neutral (pH 7.5) stream, on the left, with a strongly acidic stream (pH 3) that drains an oxidizing high sulfidation epithermal gold deposit. The brown colour of the acidic stream is caused by precipitates of iron (ferric) hydroxides. The ridge in the distance is the crest of the Andes and the boundary between Argentina and Chile.

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Keywords: acid, acid drainage, acid rock drainage, acidic, andes, andes mountains, argentina, chile, confluence, earth science, earth sciences, environment, ferric hydroxides, geochemistry, geography, geology, geomorphology, gold, iron hydroxides, landscape, mineral deposit, oxidation, ph, river, south america, stream, sulfidation, sulfides, sulphidation, sulphides, water, weathering

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