"Metalliferous asteroids as potential sources of precious metals"
"Successful recovery of 400,000 tons or more of precious metals contained in the smallest and least rich of these metallic NEAs could yield products worth $5.1 trillion (US) at recent market prices."
Wouldn't it be nice to have all the dirty manufacturing done on the moon? That way the Earth could be used for food (maybe we could grow food on the moon too?) and habitat. Now that would make the environment wackos happy!