so basically, i just tried this out and was disappointed, but i have an idea for it. you know how with filter conveyors, when you select a rock that doesn't have ore and a rock that DOES have ore, they both appear as rock and the type of rock it is? there should be a new filter option that says "Contains: [ore]"
please add this its a hassle to manually take the ore pieces out of the rock and discard the rock