Not a bad idea, this could potentially protect the environment against "random" mining ops.
Making people more focussed on where to start their mines.
Also very specific mines could be build, as it is in the real world.
agree about the shelves, and combined with this idea:
Makes it complete and we could play around with shops and displays more...
I like the idea, the other day I was thinking about making a "food Truck", bringing food to the quarries.
Saves the people in the isolated quaries to run to town, and I can travel back and forth to my house, to fill up.
offcourse it is all possible with a "Solid" small shop near the quarries and a cart going up and down to refill the shop.
But that's way less impressive and fun :)