What if the miner hires people for $8 an hour to make sure his equipment doesn't overheat and is running smoothly?
If miner hires people to maintain his machines, its still the machines that do the work, and other people are providing him with a service for which they get paid for fully....
...unless those workers have some middle man also that will take a cut of their earnings (which is what managers do etc). The process of mining is still done by miner himself.
It also seems, you have no idea what's the point of different roles are in a business and how businesses operate. Again, this is the core reason, why idiots think communism is good.
