My main Sim, Star, had a wish to find 50 gems, and then another wish to find 50 metals with his miner, and I ended up with 4 or 5 gigantic space rocks. I should have kept track of how much they were worth, but was just surprised by the sheer size having never found anything bigger than a large space rock from collecting. Those miners look to be pretty lucrative. In a single day he could drill 3 or 4 holes, and usually found a handful of different items in each hole. Got a lot of scrap, but I had nearly all gems before I even began to start looking for them with the collection helper. The pink diamond I cut for his Simbot's heart was found with the miner. Found a bunch of soulpiece gems with that thing too.
*hugz*
-LD