I think it would be cool if there were mining robots you could research. They would not by flying robots, would work within a ground range of a robo port, deposit into the logistics network, and need to recharge in a similar way to flying robots.
The pros would be very little pollution (equivalent to hand mining) and very little infrastructure (no belts, power poles, miner machines, etc.. just a robo port).
The cons would be that they can't increase productivity in the same way that mining productivity improves the electric miners, and speed could only be increased with worker robot speed / cargo size.
They would be useful for midgame outposts, allowing for simple setup and giving off little pollution, but later game the regular miners would be favoured again.