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Acid mine drainage - causes effects and solutions For hundreds even thousands of years human beings have mined for metals and stones and with the advent of greater technology as well as greater needs the demands for these resources continue to grow While these resources benefit our lives in many ways the effects of mining can be detrimental and one such effect is the topic of this essay acid mine drainage AMD The causes of AMD will be discussed along with some of the physical and biological problems associated with it Some prevention and remediation treatments will also be considered Acid mine drainage refers to water leachate drainage or seepage that has come into contact with oxidised rocks or overburden that contains sulphide material coal zinc copper lead Keller 2000 USGS USEPA 2002 A common sulphide is pyrite or iron disulfide FeS2 and throughout this essay it will be pyrite that will be the primary sulphide considered Acid mine drainage is not a new phenomenon early mining techniques utilized gravity to avoid water pooling resulting in the water becoming polluted by acid iron sulphur and aluminium USEPA 2002 It is most commonly associated with coal mining especially with soft coal coal that has high sulphur content The pyrite that is present in coal seams will be accessible after surface mining when the overlying surfaces are removed or in deep mines that allow oxygen access to the previously inaccessible pyrite-containing coal DEP 1 1997 After pyrite is exposed to air and water sulphuric acid and iron hydroxide are formed creating an acidic runoff DEP 1 1997 2 2002 When the water comes into contact with the pyrite the chemical reactions that take place causes the water to increase in pH which will dissolve heavy metals which stay in solution However when the pH levels reach a certain stage the iron can then precipitate out coating sediments
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