Possibilities for improving work efficiency of continuous surface mining systems operating in rocks with excessive digging resistance
Journal Title: Górnictwo Odkrywkowe - Year 2018, Vol 0, Issue 4
Abstract
Long-term strategic planning and scheduling is crucial for successful operation of continuous surface mining projects. It is a complex and multi-objective optimization problem, where the spatial model of the geological and mining characteristics of the deposits is an important issue. The occurrence of geological structures with excessive digging resistance in the overburden material of the deposits affects the efficiency of the mining system and requires appropriate mine planning and scheduling optimization. This is also the case of South Field Mine, the largest mine that is currently in operation in Ptolemais lignite-bearing basin, Northern Greece, where layers of conglomerates and sandstones with excessive digging resistance are present in the overburden strata. In this work, the evolution of South Field Mine operation, in relation to the spatial distribution of hard rock materials in the mine is presented. For the strategic planning of the mine, a graphical model has been developed. This model is applied for the selection of the best alternative for the long-term planning of mining operations. After various in-field tests, the combined use of continuous and conventional mining equipment (i.e. shovels and trucks) was finally decided to be applied for dealing with hard rock formations. Furthermore, a geostatistical model is presented for spatial interpolation of hard rock materials, based on several drilling data collected from the mine area. Finally, the efficiencies of Bucket Wheel Excavators working in soft and hard rocks are compared based on a statistical analysis of operational data.
Authors and Affiliations
Christos Roumpos, Daphne Sideri, Nestoras Kolovs, Theodore Mukopolisacharyd, George Apostolopoulos, Michael Galetakis, Antonios Vafidis
Keywords
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