On November 3, 2023, our dear colleague, Prof. Dr.-Ing. Hans Hoffmeister, born in 1932 in Kassel, Germany, passed away in Ahrensburg, near Hamburg, Germany. Hans Hoffmeister finished his Dr.-Ing. degree and his habilitation at the mining university TU Clausthal. Since 1974, he had been working at Helmut-Schmidt-University in Hamburg. Hans joined IIW in these early years, working primarily in Commission IX, together with other well-known colleagues, including Trevor Gooch, Damian Kotecki,...