Question - this township is in Pa - where anthracite is abundant. If memory serves me right, I think anthracite accounts for only 1 % of U.S. coal which in turn has 27.!% of world's coal. 50 % of U.S. coal is low rank coal (lignite & subbutiminous coal) - making up more than 1/8 of world's coal - which Silverado uses. How practical is anthracite here & how long will it last?