Unfortunately, others have already done this - extracting great riches as they did so - and left their "mark" on the planet. Of course, without looking it up,

Unfortunately, others have already done this - extracting great riches as they did so - and left their "mark" on the planet. Of course, without looking it up, I couldn't tell you who they were, even though some of these "big holes" are right here in "my backyard" down in southern Arizona (about the best I can tell you is that they were mostly for copper mining and...yep). Or - take this big hole; without looking it up, do you know who made it? http://www.nationmultimedia.com/img/news/2017/08/06/30322996/7b64a5397251773aa5f978cddb4771b1.jpeg http://www.nationmultimedia.com/img/news/2017/08/06/30322996... ...got the owners a lot of diamonds, though. Even so - they'll be just as forgotten.