Metamorphic development, degree of reduction, and other characteristics of Donets Basin coal

Analysis of the elementary composition and parameters V ^daf , y, and Q _s ^daf of coal from more than 100 beds in the Donets Basin indicates that the considerable difference in the properties of coal characterized by reduction (in terms of S _t ^d ) and uniform metamorphic development (according to C ^daf ) is due to variation in the ratio of the number of hydrogen and oxygen atoms (H/O_at) in the molecular component of the coal’s organic mass.