Miners not mining designated area

Miners not mining designated area - Top view of large area with black coal with car tracks in daytime

I cant figure out why my miners aren't mining an area I designated. I designated 2 areas before and they mined it out fine. Now I designated an area a bit deeper (maybe 30 tiles away) in and they arent going. However, if I designate an area closer (just 5 or so) they mine it. Why is that? enter image description here

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