Re: I idly wonder about the challenge of landing this on earth ?
I considered that, but as part of my “research” (loose sense of the word) I discovered we mine almost 200 tonnes of platinum a year, so probably not as big an adjustment as you might think. I was particularly surprised by that.
I suppose the other thing to consider is the cost of mining that on earth as a comparison to a shuttle-esque mission. Hard to put a number on it, but some stories suggest platinum mining is barely breaking even at the moment, so maybe the space shuttle to the non-existant platinum moon might be worth considering.