Hey, good question!
I haven't really thought much about it yet.
I do think it could be cool to have like a two-step process.
Where you first have to crush the stone. Then move the crushed stone to a washer, to filter out the ore.
But I don't know, might be too much work, for such a little gain.
This was only intended to learn modding, and find another use for stone.
But I'm open for more ideas that might fit within the scope of processing stone.
If there's any other uses you'd like for it.