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The paper describes using wastes from power industry for filling the open pits. It presents the types of post-mining open pits which require filling and reclamation. The methods of using combustion by-products which come from commercial power stations and thermal-electric power stations are presented in the paper. The types of combustion byproducts, their origin, amount and features are discussed. The significant differences between parameters of ashes from brown coal and hard coal are underlined. The properties o...