The mined asteroids will be in near Earth orbit, so any "sending" will mostly consist of "falling" :p
Granted, successful and safe reentry is not as trivial as I make it sound, but it is still uncomparably cheaper than the opposite - launching a payload to orbit.
Speaking of which, what makes you think they will even want to land the materials at all? They can instead just make use of them in space, saving us the huge expences that launching the same materials from Earth would involve. Of course, making use of minerals or metals directly in orbit is clearly a very long-term prospect, but so is the whole idea of the new organization. And at the same time water and fuel can also be "mined" from some asteroids, and these can be put to use right now.