Coal Coal Coal

I was looking at coal in utah and found out that there is an estimated 62.3 billion tons of coal on the Kaiparowits plateau, or the Grandstaircase Escalante. 32 billion tons are un-mineable because either the coal is to deep which would be 3,000 ft or greater or it is too thin which would be less than 3.5 ft. That leaves 30 billion tons that are mineable. The UGS feels that an additional 7.5 billion tons inside seams 3.5 to 6 ft thick are not mineable because they are to thin for current long wall operations in Utah.