Could you consider making a bucket-wheel excavator available for our mining operations?
In theory, the BWE could function like a "reverse" Stacker Tower.
Regarding material sorting, the simplest method might be to use U-shape sorters or, perhaps, something more elaborate such as multiple exits at the initial installation point.

I like this idea

Yeah, I like this idea too. A truckless, conveyor-based mining machine, optimized for cutting down mountains. I would expect this machine to be unable to make/traverse ramps, and therefore most useful in mountain deposits... or in terrain leveling/mountain removal.