Deuterium is abundant on earth as well. It's tritium and helium3 that's unusually abundant on the moon. But it's the result of solar wind deposition over copiou

Deuterium is abundant on earth as well. It's tritium and helium3 that's unusually abundant on the moon. But it's the result of solar wind deposition over copious amounts of time. And it's one of the dumbest reason to mine the moon. You can run the math the flux of those elements from the solar wind is minuscule. The area you'd need to harvest for a reliable steady state is huge. You'd be better off putting up solar panels, energizing a rail gun and launching more solar panels into space made from lunar silica.