With a relatively small initial investment, you can build reentry vehicles out of the asteroid, depending on the specific composition.

Or, just fashion the metal into ingots that are coated with an ablator (carbon, say) and allow them to enter as artificial meteorites. Suitably sized they will hit the ground at reasonable speed and can be dug up.

Even better than carbon use an ablative made out of olivine that can sequester CO2 as it ablates.

That way by offloading mining and refining into space to prevent the damage that these activities incur on earth you're also undoing damage to Earth from past human activities.