North American Product Classification System (NAPCS) Canada 2017 Version 2.0

144 - Coal

This group comprises coal, a combustible black (hard coal) and brownish-black (brown coal) rock consisting of more than 50% by weight and more than 70% by volume of carbonaceous material. It is formed from plant remains that have been compacted, hardened and chemically altered, and metamorphosed by heat and pressure over geologic time.