you should buy a coking bituminous coal such as pocohontas sewell etc. or any bituminous that you have available. most coal east of the mississippi is not completely freeburning and thus will all coke somewhat- which is what you want as a blacksmith. anthracite doesn't work as well because it needs more coal around it ignited to continue combustion, it doesn't like to smoulder and idle w/out much underfire air and it's slower to bring up to working temp in a forge because unlike bituminous coal/coke, the carbon is much more dense w/ anthracite. having said all that some people do use it, but most prefer a coking bituminous coal. btw, don't buy into the blacksmith's "old wife's tale" that sulfur is somehow evil in blacksmithing coal- it's not. that myth got started for two reasons one- when making iron or steel from iron ore you don't want too much sulfur in the coal because it imparts sulfur to the metal that making it weak and brittle (this ONLY happens when iron ore is being reduced in a BLAST FURNACE, if your working metal in your forge at those temps, well, you won't have a forge left) the second reason for the sulfur myth is that people believe more sulfur means more clinker- which is sometimes true, but only if the sulfur is pyritic in nature not organic. what i'm trying to let you know is that if you find a coal that's reasonably priced and works well for you, don't worry at all if the sulfur content is rather high it won't affect anything you are doing.