Sep 01, 1977 · (2) More spontaneous combustion in stored coal piles. 89 TABLE 3 Characteristics of western and eastern fuels that affect flue gas properties and design and operation of fly ash collectors (G. Green, P_ S_ Colo.) Colorado coal Wyoming coal Eastern Ariz., N.TNI, Nev. steam coal 'Moisture, wt. :o 10 29 2 1-1 Volatile matter, -.vt o 35 33 35 Fixed