It happened. If you lived in the area, Central Fl, you knew folks making it happen. There was no coverup.
I know one of the engineers who wrote the lander software. They had three computers that were maxed out during landing. Remember, they had tubes in the 60's and the lander was the reason that ICs made it big time. Each computer, which was just a ballistics computer, had to be the size of mini-desktop to fit. So, the fly-by-wire was run through 3 computers for redundancy. During final landing cycle, if ANY ONE had failed, the system would have automatically aborted and shot back to orbit. On Apollo 11's final approach, the site had an obstruction, Armstrong had to hover and move to the side. The computers were at about 100% utilization and they were then asked to do more... Our friend Pedro was one of the guys that was turning blue. The software team was afraid of the abort.
Oh, and there is plenty of good stuff on the moon and in the asteroid belt. But, it is not just lying around in piles labelled "gold" and "uranium". You still have to mine it and refine it. One lunar lander <> a recovery and refining facility. Transportation has been covered.
Heinlein's "The Moon is a Harsh Mistress" has some of it covered in a story about a lunar indepence movement. A colony of miners would be required. Then railgun might be the best way to send it back with some in space intercepts. They could send it straight back as ballistic cargo, but the chance of error could yield unacceptable results as in falls down the gravity well. A non-ballistic approach adds shipping costs. So what ever it is, better be worth the cost. Also, consider what the influx of the conquered gold from the Americas did to the Spanish economy (it ruined it - made it hyper-inflated). You don't want to dump a whole lot of 'gold' into a market at once.