100 hours into the game, I've almost to steel and almost have a cementation furnace ready, but as I'm making more iron I'm getting worried about my black coal stash. I almost ran out before I did the first story chapter and grabbed all the black coal from the archives. I have 20 brown coal stacks thanks to massive deposits in the nearby claystone biome, and I've been using that for most fuel purposes, but I can't use it for bloomeries. Only black coal, and I haven't had any luck finding some even when following the propick to black coal locations. Is there a better method for fuel I should focus on like coke (which doesn't seem worth it since the wiki says it'll take 1 coal stack for just 8 coke pieces) or charcoal, which I haven't invested in much due to how quickly my iron axes break, and I need wood for finishing my windmill and leatherworking. I haven't found anthracite before so I don't know if thats an untapped option. At the moment I have 3 stacks of black coal but I'm sure I'll need of an alternative or a better resupply method for when I begin steel making. Any tips would be greatly appreciated.
TLDR - Black coal is finite, I can't find more so I need tips before I burn it all on iron to begin steelmaking.