Tested bit coal sent from Carbondale, Colorado. The coal is oily, doesn't feed well because it clumps together, and produces medium, featherweight, clinkers, the kind that grow into an octopus in the pot. Although it produced clinkers, they easily fell off the sides of the pot.
The fire is hotter and smokier than with the Alaska or Wyoming coal. This will not work in the efm stoker because it doesn't feed properly with an auger. Other than that, it's OK.