The S3Chem Working Group meeting took place on 12th September in Liege, Belgium which was a good opportunity for the ECRN director to meet with several ECRN members, who participate in the project, and to join the site visit organized at GeMMe’s laboratory. GeMMe is a unique research group in Wallonia, contributing to the development of innovative processes for an efficient management of mineral and metallic resources, and they kindly hosted the S3Chem partners at their premises.