The main challenge of this work is using the dolomite filler in lightweight concrete production. A method for inspecting a fine dolomite group has been developed for evaluation of the possibility of using this dolomite as filler in concrete. The expanded clay lightweight concrete composition has been created, where the traditional sand are replaced totally or partly by the dolomite sand used as a filler. The practical recommendations have been elaborated for evaluation, selection and applying the dolomite processing byproducts for producing of the expanded clay lightweight concrete