I don't know why you're incessant with this. Factorio is a game about automation and your direction is completely against this.
You can not have players micro-manage non-stop to keep getting stone and by having players expand their maps endlessly. Using buggy AAI vehicles for this is also just going to be taxing on UPS.
I don't care for AAI vehicles, the other parts of your mod are pretty good but I don't agree with your idea of balancing with stone at all.
Balancing is important in a challenge-adding mod.
So I asked what people think about my idea. They can also share other ideas.
Yes and pure attrition is not the way to balance this.
You've already made a great concept with interesting logistics like the surface ores having denser ones below, managing pollution underground and connecting it all through the holes. The potential of multi-layered factories is interesting too.
It's ruined by making an essential material non-existent and having you hold right click on rock walls underground all the time or to install a separate mod to automate it, which has its own issues like pathing, UPS usage and the increase in world size.
Just making stone generation act like how the other ores do, would already have fixed this problem.