There’s a story by sci-fi writer Daniel Suarez about that very idea of human mining an asteroid [1]. It’s actually a well thought out thought experiment. I suspect it’d almost require shenanigans like described in the book as modern society is so cautious as to be bordering on paranoid. Space won’t get colonized without significant risk for significant rewards.
1: https://www.marketplace.org/2019/04/24/sci-fi-delta-v-daniel...