Editorial Editorial Εισαγωγή Επιμελητή Editorial 2020-11-192019enhttp://creativecommons.org/licenses/by/4.0/International Journal of Mining and Mineral Engineering102-485-89 Roumpos, Christos 1978- Pavloudakis Francis Michalakopoulos, Theodore N Galetakis Michail Γαλετακης Μιχαηλ Inderscience Surface mining