Collocations for coal - noun

clean, smokeless
hard
soft
brown
bituminous, coking
opencast (BrE)
opencast coal mining

lump, piece

mine, produce
burn, use
shovel

burn

fire
mine, pit
My grandfather worked in coal mines in England and Wales.

mining, production
merchant, miner
company, plant (esp. AmE)
industry
deposit, field (usually coalfield), seam
There are substantial reserves of methane gas trapped in coal seams in the area.

reserves
bucket, scuttle (both esp. BrE)
bunker, cellar (both esp. BrE)
dust, gas, tar
These men had spent their lives breathing coal dust.
a dye made from coal tar

burning, glowing, hot, live, red-hot

glow
Red-hot coals glowed in the fireplace.