"Enrichment", in the context of nuclear power, doesn't mean extracting uranium from ore or purifying the uranium. "Enrichment" means increasing the percentage

"Enrichment", in the context of nuclear power, doesn't mean extracting uranium from ore or purifying the uranium. "Enrichment" means increasing the percentage of fissionable ²³⁵U in the uranium. This process starts with extremely pure uranium, for example in the form of UF₆, so it's the same process regardless of how dilute the original uranium was. So the energy required for it doesn't depend on the concentration of the original uranium deposit. In the case of things like coal, the energy cost of mining is significant compared to the energy obtained from it. In the case of uranium, simply because the amount of material processed is so small by comparison, it is not significant. As I showed above, it would not even be significant if you have to mine 300 times as much rock as uranium mining currently does. Obviously you would be better off investing in wind, solar, and storage than in nuclear energy. (Hydroelectric and tidal are less clear wins.) But that's not because sufficiently concentrated uranium deposits are rare. On the contrary, there's literally nowhere on the planet where uranium is insufficiently concentrated.