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set: minerals // series: // picture: mine water
Another problem with mining activities (and in particular after the mining has finished) is the generation of acid mine waters, through interaction of groundwater with pyrite. These acid waters may be toxic in themselves, but may also dissolve additional poisonous metals through interaction with other minerals present. Lime is often added to such waters to neutralise the acidity and stop the metals going into solution. The green discharge seen here is from the disused Wheal Jane mine in Cornwall (UK) and is due to the presence of ferric sulphate which is being formed after the mine water has been neutralised.