By: coal berner On: Thu Oct 16, 2008 7:59 pm
The unburnt stuff is Probably bone which is rock that is formed in with the coal you will not find bone in Superior coal
they take it out when the coal is being processed in the breaker Hudson coal you will find bone in there coal it shows
how one breaker processes there coal better then another also one breaker is deep mine coal and the other is Surface mine coal with Suface mine coal you will get alot of rock dirt and everything else that is between the Surface and the coal
vein most of it if not all of it will taken out when the coal is processed at the breaker Deep mine coal will have less
rock and other unwants because they will blow the rock face away from the coal vein and all they will have is the coal
vein to follow more coal if the vein stays big all the way threw less rock to deal with Plus the coal it self will be better Qaulity because it is deeper in the ground the deeper the coal the better it is in Qaulity in most cases some veins of
coal will have more bone it the coal then other veins of coal will have There is a whole lot of other factors that go along
with this but i will not get into at this point and time but these are the basic reasons
J.C.
Heating house & water with a 1986 electric furnace man DF520 with buckwheat Anthracite coal