Cone of Depression
  Cone of DepressionCreated when ground water is pumped from a well or underground mine. Groundwater flow changes direction in a portion of the watershed. Instead of moving toward the natural discharge area, the groundwater within the influence of the pump flows toward the well (or mine) from every direction. The pumping well creates an artificial discharge area by drawing down (lowering) the water table around the well. This area of drawdown is called the cone of depression. Molycorp has created a large cone of depression through such a drawdown process, from pumping out its underground workings. The theory is that most groundwater contaminants will be captured in the cone of depression and safely removed from the groundwater by continued pumping. The success of capturing acid rock drainage using this method has not been adequately demonstrated.
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