Abstract
Water–rock–gas system is simulated using a technique based on the fundamental principles of modern hydrogeochemistry regarding the formation parameters of natural-water chemistry to show that groundwater pollution hazard at a gold-bearing placer is acute for any site of water exchange changing from passive to active. Under passive water exchange, the products of sulfide oxidation are accumulated; whereas under active water exchange, the oxidation products are leached out to form acid drainage flows. The treatment of acid drainage water and the neutralization of acid solutions are more effective under reduction or weakly alkaline conditions.
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