Quote:
Originally Posted by dragoon500ly
Second problem is the footprint of the excavations. Spoil. hundreds if not thousands of tons of it. Its got to go somewhere.
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This is a big problem. The three rings suggested here will produce a little under 593000 cubic yards of material. This would take a Cat 797F Mining Truck about 1977 trips to haul away from the main bore hole, around 791000 tons.
If you bore near a natural cavern, you could just dump underground. Another possible solution could be to drill a network of shallow horizontal wells over a couple square miles and pump mix of water and pulverized rock into them, raising the ground level a few inches from below. Kind of like fracking, only with liquid rock into softer loam.