%0 Journal Article %A Hennig, Alexander %A Niemann-Delius, Christian %A Skrypzak, Thorsten %T Hard rock mining the opencast way versus a combination of opencast and deep mining methods : an energy balance sheet %J Glückauf-Mining-Reporter %V 1 %N April %@ 0176-4101 %C Essen %I VGE-Verl. %M RWTH-CONV-014790 %P 37-41 %D 2010 %F PUB:(DE-HGF)16 %9 Journal Article %U https://publications.rwth-aachen.de/record/133736