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Methollogy for optimal determination of new drilling program in an active open pit : example from an active sulfate open pit in altsi ,Lasithi prefecture ,eastern Crete

Manoutsoglou Emmanouil, Panagopoulos Georgios, Spyrídonos, E, Georgiou , A

Πλήρης Εγγραφή

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Περίληψη

For the cement industry the minerals gypsum and anhydrite, due to their similar chemical composition,are of the same importance. In cement production line, the energy requirements for grindinganhydrite are different from that of gypsum. Occasionally, the difference in mechanical propertiesof the extreme members (anhydride / stiff - gypsum / brittle) can cause problems during grinding procedure.For these reasons it is necessary to be aware of the spatial distribution of these rocks in anactive open pit. This knowledge, because of its strict connection with the calculation of the reserves(geological and recoverable), contributes to the direct production planning of the open pit and to themedium and long term planning as well. In order to approach the spatial distribution of sulphaterocks in the active gypsum open pit of INTERBETON S.A. in Altsi (Sitia region, Εastern Crete), newexploration boreholes were drilled. The proposed methodology concerning the determination of thenew borehole locations consists of two steps. In the first step detailed geological mapping of thesurface sulphate rocks is conducted and in the second step a three-dimensional geological model isconstructed. The model’s construction is based on data derived from a past drilling program. Thosedata were enriched with the results of geochemical analysis of 100 new surface samples. The surfacesamples were taken by means of Wagon Drill accordingly to a predefined grid. Five differentdrilling scenarios were proposed, contributing to the determination of the optimal drilling program.

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