Yup. More metal than has been mined in the history of mankind. The fact that we haven't even plans for asteroid mining is disappointing.
It is a difficult prospect.
When these articles post about an asteroid coming near earth, they put it in such terms as this one: “roughly eight times the average distance between Earth and the moon.”
The trick will be to use the moon’s gravity to capture it, without having it land on people’s heads here on earth. I’m wondering if it’s possible to transfer a moon-orbiting satellite asteroid into an earth-orbiting satellite asteroid with a nudge here and there.