How many missions would it take and how much would it cost to move mining equipment to the moon, then transport metals to Earth? Astronomical! Not gonna happen.
I'm going to start my own moon mine with blackjack and hookers. In fact forget the mine and the blackjack.......ah screw the whole thing
A 20' general container, filled with 20tons of H3 (Helium 3), when fused could run the world's power supply for a year. 2 kg's would be enough to run any major city in Australia for a year. Gotta be some revenue in that. In some ways, if you were to mine the moon, you could take on a large say with energy supply, and change the world stage !