The aim of the project is to develop a reference material for the control of chemical analysis of metal concentrates. This material will be used to check the relevance of degradation techniques, analytical procedures and follow-up results, as well as commercial certified reference materials, in monitoring the quality of production and at the same time for checking the accuracy of data generated in the laboratories of business partners. Ref. material should better reflect composition of composites than commercial reference materials intended for metallurgy. a.