“…Past studies (Amyotte et al, 1995; Amyotte, 1996; Dastidar et al, 2001; Cashdollar and Hertzberg, 1985; Cashdollar et al, 1987, 1989; Cashdollar, 1996, 2000; Harris et al, 2015; Cybulski, 1975; Man and Harris, 2014; Rice, 1911; Rice et al, 1927a, 1927b; Richmond et al, 1975; Sapko et al, 2000) have shown the influence of coal's volatility and particle size on its explosibility and rock dust inerting requirements. Such studies led to the formulation of the initial legal requirement that mine dust in bituminous coal mines (anthracite mines are exempted due to their much lower volatility) must have an inert content of at least 65% in entries and 80% in air return passageways (CFR, 2010).…”