“…Onyearu [18] reported that Nigerian coal consists of approximately 49% sub bituminous, 39% bituminous, and 12% lignite coals. Data on historical coal production in Nigeria was compiled from various sources [17,20,27], and presented in Figure 1. Coal production increased from 24,511 tonnes in 1916 and steadily until a peak production of 925,000 tonnes was attained in 1958, after which production declined to 20,000 tonnes during the Nigerian civil war in 1968.…”