Basic principles of coal classification by useful quality

The authors introduce the fossil coal classification in terms of useful quality of coal, by using the facet method and the qualimetry principles, in terms of the power-generating coal from the Kuznetsk Coal Basin and coking coal from Southern Yakutia. The new-proposed classification completes the existing classifications on the topic, and describes the full range of coal quality indexes according to a consumer and their significance in the final product quality evaluation.