[flogic]

I'm not sure Apollo is the best benchmark. The primary goal was to send the astronauts there and bring them back. Just changing the primary goal should result in a huge reduction in the cost per gram. You'd just send a tiny excavation rover and have it fill bins for the return trip. Followup trips might even skip the rover and just use the one already there. There is a huge amount of room for efficiency and cost savings especially if you leave the humans home.

Though, Moon rocks are a bit of an outlier. They don't have much value outside of science and as a curiosity. You might want to focus on something with more predictable demand. In which case, it may get more complicated than "shovel stuff into a bin".