Everyone who is in their 70's and 80's that I've talked to in our Northumberland County area say that from Trevorton to Mt Carmel the coal is softer. It burns faster and gives a lot of ash. Coal from Mt. Carmel to Scranton gets harder the farther north you go, and the harder the better to a point. One old friend told me that it is possible to get coal so hard that it won't burn.
I've been buying coal in Mt. Carmel for the past 2 years at Harmony Mines. Very very satisfied. The downside there is they will only sell you 2 ton per week retail. It is $150.00 per ton if you haul it yourself.