It came up with iron and aluminum as the profitable products. The companies that ought to be interested are steel companies like Weirton Steel and US Steel, and aluminum companies like Alcoa. This is at variance with popular sentiment, for sure, but business is business.
I mentioned Larry Niven's pieces on asteroid mining (by "belters"). These include not only fiction but non-fiction essays. He also highlights iron and aluminum, as well as things that would be valuable to space habitats and space industry itself, like water and other elements, or even the left over "slag" for shielding.
He wrote a really nice piece about some work done by folks he'd talked to at JPL : take an mylar Echo satellite (am I dating myself) and spray it with something to make it rigid, cut it in half to form a hemispherical mirror, place an nickel - iron asteroid at it's focal point. Drill down the axis of the asteroid and insert water tanks along the axis. Spin the asteroid at the focal point of the mirror (focusing raw sunlight) and you'll gradually make the asteroid molten, from the inside out. Finally you'll reach the water tanks, which will burst inside the molten nickel - iron mass. If you've done it right you form an instant sperical shell, suitalbe for use as a habitat. Of course he gets the basic tools for this from the tools for processing the minerals out of the asteroid in the first place. I always figured I didn't want to be the one to try this the first few times, before they worked out the math (g)