Geopolymers from mining tailings for more sustainable raw material supply Robert Obenaus-Emler, Mirja Illikainen, Mahroo Falah, Päivi Kinnunen and Kari Heiskanen MATEC Web Conf., 274 (2019) 05001 Published online: 22 February 2019 DOI: 10.1051/matecconf/201927405001