Those waste banks could be sources for fuel, alumina.
Busch-RA; Backer-RA; Atkins-LA; Kealy-DC
Coal Min & Process 1976 Aug; 13(8):46-49
This is a Bureau of Mines report on the subsurface physical property data developed on the fine coal waste materials that make up the core areas of two typical coal waste impoundments. These data will help define more completely the engineering properties of this problem area of the structures.
OP; Journal Article
Coal Mining & Processing