the formation and movement of highly acidic water rich in heavy metals. This acidic water forms through the chemical reaction of surface water (rainwater, snowmelt, pond water) and shallow subsurface water with rocks that contain sulfur-bearing minerals, resulting in sulfuric acid. Heavy metals can be leached from rocks that come in contact with the acid, a process that may be substantially enhanced by bacterial action. The resulting fluids may be highly toxic and, when mixed with groundwater, surface water and soil, may have harmful effects on humans, animals and plants.
See also acid rock drainage
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Note: Acid mine drainage (AMD) is a significant environmental risk associated with copper mining, particularly in sulfide ore deposits. AMD can lead to severe contamination of rivers, groundwater, and ecosystems, making water treatment and mine waste management critical. Preventative measures, such as proper tailings storage, water treatment systems, and controlled backfilling of waste rock, are essential to mitigate AMD risks in copper mining operations.
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