A large part of the waste volume in Switzerland, and in the canton of Bern, is mineral waste in the form of excavated and demolition materials, as well as residues from municipal/industrial waste- and wood incineration. The project "Substitute Raw Materials in the Circular Economy" makes a valuable contribution to addressing these issues by creating the necessary basis for recycling secondary raw materials. The project aims to investigate the material currently deposited in landfills as well as their potential for recovery, recycling and up-cycling. This includes: concrete demolition waste; excavated and quarried material; fractions from processing plants; bottom ash from municipal solid waste incineration (MSWI); and wood ash. In a second phase of the project, implementation experiments will be performed (e.g. on a laboratory and pilot scale) with promising material streams. The project is intended to build the knowledge basis for establishing the maximum use of secondary raw materials in the long term. The gained knowledge may later be applicable nationally as well as internationally.