Objectif THIS STUDY WILL DEVELOP AN OPTIMAL METHODOLOGY AND IT WILL BE APPLIED FOR THE GRASS-ROADS DEVELOPMENT OF A THIN-VEIN POLYMETALLIC, SULPHIDE DEPOSIT. THE METHODOLOGY WILL BE APPLIED TO THE MOLAI OREBODY, WITH SIGNIFICANT ADVANTAGE TO METBA. THE SAME TECHNIQUE COULD BE AVAILABLE TO OTHER SIMILAR DEPOSITS (BY REDUCING INVESTMENTS COSTS AND IMPROVING SAFETY MINES AND REDUCING PRODUCTION COSTS). The research work carried out has centred on the development of the optimal exploitation methodology for thin vein type polymetallic sulphide deposits, with particular application to the Molaoi ore body. This was realised by developing experimental mining works, by carrying out geomechanical and hydrogeological studies and by developing and testing a model of the mine.The aim of the present work has been the development of the optimal exploitation methodology for thin vein type polymetallic sulphide deposits, with particular application to the Molaoi orebody. To achieve this goal geomechanical and hydrogeological studies have been carried out, a mathematical model of the mine has been constructed, and experimental mining works were developed. The aim of the geomechanical studies has been the evaluation of the overall behaviour of the rocks surrounding the excavation and the determination of the local stability features, in order to select the optimal exploitation method. This was realized by collecting and evaluating data relevent to the geometrical characteristics of the orebody, rock mass characteristics, rock stability, etc. Furthermore, the scope of the hydrogeological studies has been the determination of the pumping requirements of the mine, as well as the effect of water on the rock stability. The hydrogeological part of this study does not exclude the risk of a high quantity water inflow connected with the neighbouring limestone formation during the future possible exploitation. It is suggested that this risk maybe further examined and considered in the mine planning. From the geomechanical and the modelling part of the study it is deduced that there is a need for further evaluation of the overall stability of the filled stopes.With the results obtained up to now it is concluded, in general, that because of the very bad quality of the rock mass and the ore, the presence of water and the geometry of the ore body, the descending cut and fill mining method with cemented back fill must be selected.1. GEOLOGICAL AND PHOTOGEOLOGICAL STUDY THE APPROPRIATE GEOLOGICAL AND LITHOLOGICAL MAPS WILL BE PREPARED, AND SURFACE DRAINAGE PATTERNS AND GEOSTRUCTURAL CONDITIONS WILL BE EXAMINED USING THE AVAILABLE AERIAL PHOTOGRAPHS, SUPPLEMENTED BY FIELD MAPPING. 2. GEOMECHANICAL STUDY THIS WILL INCLUDE COLLECTION OF ALL THE BASIC ENGINEERING DATA NECESSARY FOR ROCK MASS CHARACTERIZATION. FURTHER, A MATHEMATICAL MODEL OF THE UNDERGROUND MINING WORKS WILL BE SET UP, AND USED FOR THE SELECTION OF THE OPTIMUM EXPLOITATION METHOD. 3. MODEL APPLICATIONS THE MATHEMATICAL MODEL WILL BE APPLIED FOR THE DESIGN OF THE UNDERGROUND WORKS, AND CHECKED FOR VALIDITY AGAINST THE ACTUAL BEHAVIOUR OF THE WORKS. 4. HYDROGEOLOGICAL STUDY ALL THE NECESSARY DATA WILL BE COLLECTED AND USED FOR THE PREPARATION OF A HYDROGEOLOGICAL MAP OF THE AREA. IF NEEDED, A PUMPING TEST WILL ALSO BE INCLUDED. 5. EXPERIMENTAL MINING OPERATIONS THESE WILL INCLUDE THE OPENING OF AN EXPERIMENTAL INCLINE IN THE UNDERLYING ROCKS, FROM THE + 165 TO THE + 135 M LEVEL, AS THE MAIN ACCESS TO THE OREBODY, A SECOND STEEP INCLINE AS A SECONDARY EXIT, TWO HORIZONTAL CROSSOUTS AT THE + 135 AND + 125 M LEVELS, FROM THE INCLINE TO THE OREBODY, TWO DRIFTS WITHIN THE OREBODY AT THE + 135 AND + 125 M LEVELS, AND VARIOUS OTHER DRIFTS CROSSCUTS OR OTHER WORKS AS NECESSARY. A TRIAL EXPLOITATION OF THE OREBODY WILL TAKE PLACE BETWEEN THE + 135 AND + 125 M LEVEL, RESULTING IN THE PRODUCTION OF APPROXIMATELY +/- 5000 OF ROM. DURING THE EXPERIMENTAL MINING OPERATIONS, THE RESULTS OF THE MATHEMATICAL MODEL DEVELOPED WILL BE TESTED, AND USED TO ADJUST THE MODEL. Champ scientifique natural sciencesearth and related environmental scienceshydrologyhydrogeologynatural sciencesmathematicspure mathematicsgeometrynatural sciencesmathematicsapplied mathematicsmathematical model Programme(s) FP1-RAWMAT 3C - Research programme (EEC) on materials (raw materials and advanced materials), 1986-1989 Thème(s) Data not available Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur Aegean Metallurgical Industries SA Contribution de l’UE Aucune donnée Adresse 1,Eratoshenous Street 11635 Athens Grèce Voir sur la carte Coût total Aucune donnée Participants (3) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Institute of Geology and Mineral Exploration Grèce Contribution de l’UE Aucune donnée Adresse 70,Messogeion Street 11527 Athens Voir sur la carte Coût total Aucune donnée National Technical University of Athens Grèce Contribution de l’UE Aucune donnée Adresse 42,Odos 28 Octovriou 42 10682 Athens Voir sur la carte Coût total Aucune donnée Politecnico di Torino Italie Contribution de l’UE Aucune donnée Adresse Corso Duca degli Abruzzi 24 10129 Torino Voir sur la carte Coût total Aucune donnée
