Sorry for the brainstorm, but ideas keep coming to my mind:
First tell you that this idea may be too complicated as well, sorry if it is.
The same way the electric miners kind of detect when they are mining uranium, and they add to theirselfs a pipe connection for sulfuric acid, this machines could do something similar, so If they are mining uranium, one arm gets a pipe connection, and the other three split uranium, but if it's any other ore, then all arms split ore
This would be extremely useful, because if you think about it, you don't really need to mine so much uranium, I mean, in long terms you do mine a lot of it, but you don't need so much at once, however you do need so much iron, or copper at once, so 4 exits better than just one