In the Niedźwiedzia Góra deposit, during processing of diabase into broken aggregates certain amount of wastes is generated. The author has determined their mineral, granulometric and chemical composition. They are composed of diabase fragments and loose mineral grains (plagioclases, pyroxenes, ore mineraIs) as welI as of secondary minerals formed during weathering (seladonite, smectite, chlorite, oxides and hydroxides of iron, carbonates). The wastes are similar in their mineral composition, but differ in quantitative mineral content depending on granulometry of the material produced. The folIowing granulometric varieties can be distinguished: - silty sands and sandy silts with clay interbeddings deposited in the settling pond, - sandy and silty gravels disposed on the external dump. In the chemical composition, substantial amounts of Fe203 (up to 13.86 wt.%) and alkalis (up to 4.93 wt.%) should be stressed. The clay interbeddings from the settling pond show technological properties that predestine them to the production of building materials (faience and stoneware masses, enamels).