Are you looking for a recipe for a particular commercial beer or just a porter with the name 'coal' in it? I ask because I have a few "coal porter" recipes that I brew somewhat often, although they are mostly big and dark robust porters with some roasted barley or black malt in them.
Regardless, here's one of mine that turned out quite well. 80% Pale, 7% chocolate, 5% med crystal, 5% brown malt, 3% roasted barley - OG 1.060, 35 IBU of Fuggles, Wyeast 1318.
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