The Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, Including the Moon and Other Celestial Bodies of 1967 precludes this asteroid becomming private property. No same investor will invest in such a project. So the profits you suggest will never happen, unless we withdraw from the treaty.
Newt said Private Investment and Nasa, Private firms have the right to go and mine them. Part of the agenda in Davos Switzerland was on that very subject.