Drilling deep holes in the Earth encounters the significant problem of heat. Not so for the Moon, or any of the other seismically dead planets and smaller bodies. Update: the core of the moon is believed to still be very hot, powering moonquakes.
The hope is a minable core of solid metal like seen in certain meteorites.
On the other hand, can we dissipate heat better from a deep Earth bore or mine? Perhaps use the ocean.
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