Coal Mineral Deposits in Nigeria, West Africa with their Locations .Surface mining is used when the coal seam is near the surface. b. Underground mining when the coal is deposited far beneath the earth surface and includes. i. Room-and-pillar mining and. ii Longwall mining. During the coal mining era, the method used in the Western part of Africa especially in Nigeria was the.mining of coal in nigeria,Nigerian Coal Corporation - WikipediaHistoric coalfields that no longer produce coal are in italics, functional mines are in bold. Amansiodo Coal Field, Enugu State; Ezinmo Coal Field, Enugu State; Inyi Coal Field, Enugu State; Obwetti Mine. Obwetti was closed down due to low production in the late 1950s. Ogbete Mine, Enugu State.