As abandoned mine voids, shafts and refuse piles are soaked with rain and ground water, they then drain out of various point and non‐point sources, unleashing AMD into streams and rivers. Highly acidic and metal‐laden waters decreases the quality of water, kills fish, benthic macro‐invertebrates, native plants, can dissolve bridge supports and pipes, smells foul and is unsightly. It poses a threat to wildlife and biodiversity, and can be a danger to human health and safety, recreation, public works and undermines the local economy.