Im not from PA but i found these folks really nice and helpful http://www.readinganthracite.com/about- ... nthracite/
(and you might as well take a tour while your out their and make a mini educational Vaca out of it), but wait to hear from some people who live their as im sure they can lead you better then me (I would look for members from the northern coal field area since this is the field you want to go...and PM them directly, so they will receive an Email from here telling them someone is asking for them) here is one helpful guy here Rick 386 , you can go to the PA section to find these guys easier to get some tips before your trip.
Ive always heard Pittston coal is alllll that plus a bag 0 chips! drop a couple ton in Ma. on your way home