A powerful excavator is sorely missing, especially one with an unloading belt that connects straight to a plant
Especially in the late stages, necessity forces you to use lots of excavators and large vehicles, which is very inconvenient and very costly, and still doesn't give a stable supply of resources: either an excavator stops, or something else. What's sorely missing is, first, a concentration plant, not just a sorting plant, that's one; second, give the sorting plant as many input lines as it has outputs; third, I'd also add a remote receiving hopper for intake, because one plant usually takes several ores, plus the rock and dirt that come along with them, which limits speed very heavily, and the choice is either several plants, which is very inconvenient to merge afterwards, or, like now, a bunch of vehicles hauling resources from the excavators to the plant, a huge load on maintenance, emissions, fuel, and all because there's no other way
so I suggest adding
- input ports for the Ore sorting plant
- concentration plants, for extra complexity,
- loading hoppers where you can dump everything from the vehicles and transport it by belt to the sorting plant
- a huge excavator like the one in the picture, for expansion, so to speak, and so that you could connect this excavator either directly to the sorting plant or to that same receiving hopper
