Waste Rock Dump (WRD)
 

Waste Rock Dump at Molycorp near Questa, NM Waste Rock Dump at Molycorp near Questa, NMRock or mineral with no commercial value which must be removed from a mine to access valuable ores, and which is then dumped near the site often in huge quantities. On the right is the "Spring/Sulphur Gulch" waste rock dump at Molycorp. This and other waste rock dumps contain acid generating materials.

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