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I'm not convinced about "pollutants". What comes out of the ground is either inorganic rock sludge that can be turned into building materials or industrial feedstock, or organic combustibles that can be burned in any way that produces useful heat.
Rock is rock. If it contains heavy metals, it may be worthwhile extracting them. "Just hard silicates" still makes useful ballast for concrete. Clay, slate and other alluvial gunge makes bricks. Waste not, want not.