Issues:

you have to find the minerals you want

you have to get to them & mine them

You have to smelt them

You have to turn that lump into something useful

If you want to move it to anywhere else in the solar system you have to move it out of the gravity well that is the moon

& then there's moon dust - it's extremely toxic

Sure, give it a go & see what happens, but I'd rather be mining asteroids :)