Acid mine drainage

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What Wikipedia says

Acid mine drainage, acid and metalliferous drainage (AMD), or acid rock drainage (ARD) is the outflow of acidic water from metal mines and coal mines.

Excerpt from the Wikipedia article “Acid mine drainage”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Gustavo Veríssimo from Setúbal, Portugal, CC BY 2.0, via Wikimedia Commons.