You still need these machines to be wired up, because there’s no way to do wireless communication in a tunnel network.
At some point, it’s cheaper to have a manual operator directly on hand than to try and automate a remote machine against all the contingencies and complexity of mining work.
The only way robots could possibly be successful at mining is if they are controlled and or trained by actual miners. And it’s still a long shot.
You still need these machines to be wired up, because there’s no way to do wireless communication in a tunnel network.
At some point, it’s cheaper to have a manual operator directly on hand than to try and automate a remote machine against all the contingencies and complexity of mining work.