GK
ECOLOGY BIODIVERSITY CONSERVATION ENVIRONMENTAL ISSUES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Granite
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Bauxite
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Lime stone
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Base metal sulphide
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Detailed explanation-1: -Abstract. Armoring of limestone is a common cause of failure in limestone-based acid-mine drainage (AMD) treatment systems.
Detailed explanation-2: -3 Risks Associated with Coal Mining Overburden Pollution AMD is the result of tailings and overburden being exposed to air and water. The oxidation of pyrite and other sulfide minerals in the presence of oxidizing bacteria results in the production of acids.
Detailed explanation-3: -Acid mine drainage is one of mining’s most serious threats to water. A mine draining acid can devastate rivers, streams, and aquatic life for hundreds, and under the “right” conditions, thousands of years.
Detailed explanation-4: -Lime treatment lagoon technology uses well documented chemical pH dependent ractions to precipitate metal contaminants in mine drainage water. An alkaline reagent is used to raise the pH of the mine drainage to the required pH causing contaminant metals (As, Cd, Cu, and Zn) to precipitate as a sludge.