Aimone,
Coal is coal,Anthracite is Anthracite.
World demand in 2014 will outstrip supply for Anthracite no matter what happens in U.S
It is more efficient[30% in most cases] than other forms of coal ,burns cleaner with less residues and hense commands a much higher price at mine gate.
All is good for ZYL future
Cheers Chooky