[lmarinho]

I'm curious about how they plan to bring these materials here. I assume changing the trajectory of the asteroid towards Earth wouldn't be a very good idea, considering the potential risk of impact. Maybe small chunks of material brought by numerous cheap reentry capsules are the way to go.

[raldi]

I'd crash them into the moon (no atmosphere, so they wouldn't burn up on entry) for about a decade, then send ore-processing robots to smelt them down, then figure out later how to bring the results back.

[Nick_C]

Good idea at first look, but it would be tricky to get the trajectory right, though. The Moon's sphere of influence is tiny compared to the Earth's. You would need a guidance package and, perhaps more importantly in terms of cost, onboard rockets to change delta-v (and only one-use because they would be destroyed on impact).