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Acid Mine Drainage

Acid Mine Drainage Environmental Notes on Mining, updated September 2009. Pyrite (FeS2) is commonly associated with coal and metal ore deposits. Its oxidation occurs spontaneously in nature, causing environmental problems like Acid Mine Drainage (AMD) and mine-tailing leachate containing heavy metals. Discharge of acid Drainage into water bodies causes an instant threat to the biota and ecological balance. In addition, acid Drainage can threaten drinking water supplies and irrigation systems downstream from a mining site. AMD is a specific type of wastewater, which arises in mining of sulphidic ores, ore tailings or overburdens. At sites of moderate-to-high rainfall, AMD can be produced in large quantities, which significantly complicates its treatment. Due to mineralogy, and other environmental factors (especially climate), the potential for AMD formation is highly variable from site to site.

Australian and New Zealand guidelines for fresh and marine water quality (ANZECC 2000) provide a list of trigger values for contaminants (i.e. heavy metals and …

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