Acid mine drainage
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Acid mine drainage, acid and metalliferous drainage, or acid rock drainage is the outflow of acidic water from metal mines and coal mines.
Rio Tinto in Spain presents an acid drainage of both natural and artificial origin (mining)
Rocks stained by ferrous precipitate from acid mine drainage on Shamokin Creek in Northumberland County, Pennsylvania
In this case, the pyrite has dissolved away yielding a cube shape and residual gold. This break down is the main driver of acid mine drainage.
Yellow boy in a stream receiving acid drainage from surface coal mining
Iron Mountain Mine
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Iron Mountain Mine, also known as the Richmond Mine at Iron Mountain, is a mine near Redding in Northern California, US. Geologically classified as a "massive sulfide ore deposit", the site was mined
Drainage from the Iron Mountain Mine
Collecting drainage in the Iron Mountain Mine