Two very good sources of photos and info regarding coal mines and how railroads served them are Chesapeake and Ohio in the Coal Fields and Chesapeake and Ohio Railway in the Coal Fields of WV and KY, both by Tom Dixon Jr.
I have both those books, plus Stan Cohen's King Coal but they don't give me an idea of which kits would work best for the outbuildings. Dynamite sheds are easy and not very large, but I model the 1950s, didn't mines stop using them in the 30s?