If we were to find gold in those quantities,we would value good less as a medium of exchange of decoration, and more core it’s physical and chemical properties, such as conductivity.
At the turn of the last century, aluminum was a precious metal. With the introduction of the Bayer process, it is cheap enough to wrap leftovers.
Gold miners in outer-space have to overcome the technical know how to build and launch rockets that can carry heavy payloads. In addition they need to transport the machinery needed to extract gold from planets. Then they have to figure out how to do this on a steady basis.
While aluminum was difficult to refine, it’s not a geological rarity, like gold. Aluminum is actually the most abundant element in the earth’s crust and the third-most common element, after oxygen and silicon, on the entire planet.
So the two, while similar, are miles apart in overcoming the obstacles they both faced. But you make my point exactly, when gold no longer becomes a rarity, like aluminum it will fall in price. Aluminum was at its high, 1,200.00 per kg. Forty years later it was worth just 1.00 per kg. 8>)