In the Anthracite Ridge coal district, the only identified minable bed of anthracite, 4.2–6.6 ft (1.3–2.0 m) thick, underlies an area of no more than 2.5 acres (1 hectare) and totals no more than 22,000 short tons (20,000 metric tons) (Waring, 1936; Merritt and Belowich, 1984). One other reported anthracite occurrence (Merritt and Belowich, 1984), too thin to be mined, is on a large active landslide (Detterman and others, 1976).
Looks like a nice deposit for a small miner, 4-6 foot thick in 2.5 acres. I wish they mentioned how thick the overburden is. This came from this article, http://pubs.usgs.gov/dds/dds-077/dds77text.html
and was copied from the Matanuska coal field section.
They also mention the Keni coal fields with coal ranging from 8,000 - 10,000 BTU, and some information about the Homer fields. Sort of hard to read, because it seams to jump around a lot.