Acid drainage due to leaching of spoil heaps by rainwater is an
environmental problem associated with abandoned coal mines.
Coal is a type of fossil fuel which is highly acidic when it comes in contact
with rain water. Acid drainage takes place due to leaching of spoil heaps by
rainwater. There is usually the presence of heavy metals also which makes
it an environmental risk.
The aquatic species are mostly affected as the acidic water flows into water
bodies thereby killing animals and bringing about environmental problems.
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