Hi KTM,, what I do is send the breaker a check for the planned amount, say 24 tons... since they have a pretty good chunk of your $$, if the load goes under, they send you a refund check,, if the load goes over, they will bill you. OR, one trucker paid the breaker for the coal,, and charged me upon arrival for the whole load and transportation.. I guess it depends on how you want to do it, or who you are dealing with..
Reading coal is marginal.. I bought a lot, and had my share of problems., but should be ok for you to see if you can get your firebox to burn anthracite well... I built a big boiler,, with a long firebox like you have..I call it 'Big Bertha'. Mine is 54" inside with 'V' shaped sides... Lucky for you your grates look pretty agressive, and should be able to shake and grind up hard ash. I ended up converting it to a stoker feed.. then rebuilt and installed a coal-only boiler.
Do a search for 'firebox reducer' , there have been several threads about doing this.. The problem with burning coal is that coal wants to be in a deep fire... It would burn very well in a firebox shaped like a 5 gallon bucket... grates on the bottom to let air in, and the heated surfaces for air or water above. If you try to burn the same amount of coal as in the 5 gal. bucket but spread out only 3" deep over a 18"x24" grate, it would probably go out, and only burn about halfway.. lots of partially burnt and unburnt coal..
So with your firebox, you need to make as deep a fire as possible, with no exposed grates where the combustion air can get past the coal. All combustion air must go through the coal bed... This is why I built a firebox reducer,, I built a cover over the back half of my grates, blocking the air flow from below.. then built a new 'back wall' to the fire box, with a stainless steel structure to hold a stack of firebrick, the allowed me to have a 22"x24"x 16" deep fire. This worked much better than the long shallow fire I had.
I'm not sure what your firebox looks like,, do you have a link to a site with a good photo, or a parts drawing??
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- False back wall to reduce the firebox to about 1/2 the length of original.