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AMD can still have an effect even after mining has stopped which is why it has been a problem for many years.The chemical reaction is caused by the mixture of surface water when it comes in contact with sulfuric minerals. When the PH drops low to a acidic level that’s when the yellow-orangish color in the water develops. The way that the mines were set up was to drain any extra water into the riviers and streams. AMD can cause residents drinking water to be contaminated and it can also be harmful to animals.