Papers by Christos Roumpos
Proceedings of the …, 2005
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Journal of Geotechnical and Geoenvironmental Engineering
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Journal of Sustainable Mining
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Energies
Surface lignite mines of the Balkan Peninsula face growing pressure due to the CO2 emissions redu... more Surface lignite mines of the Balkan Peninsula face growing pressure due to the CO2 emissions reduction initiatives, rapidly increasing renewable-power capacity, and cheap natural gas. In this frame, the development of a modern mine land rehabilitation strategy is considered as a prerequisite for mitigating the social and economic impacts for the local communities. In the case of western Macedonia lignite mines, these prospects are investigated based on a PEST (political, economic, social, technological) analysis of seven alternative land uses. Urban (industrial) development, green houses, and industrial heritage parks are considered as the most appropriate land uses for mitigating the socioeconomic impacts due to the loss of employments. For the land uses occupying large areas (i.e., agriculture, forestry, livestock farming, and photovoltaic parks), an optimisation algorithm is proposed for determining the mix of land uses that maximise revenue, equity, and natural conservation and ...
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Energies
The restoration of continuous surface lignite mines entering the closure phase is a long-term, co... more The restoration of continuous surface lignite mines entering the closure phase is a long-term, complex and multidisciplinary project. During the evaluation of alternative restoration technologies, various environmental, technical, economic and social parameters are investigated. In this framework, for the selection of the lower risk restoration alternative, the analysis of the associated risks should be incorporated into the decision-making process. This work provides an overview of practical risk management problems and solutions in mining restoration projects. Moreover, it introduces a multi-criteria methodology for the improvement of the decision-making process in the evaluation of restoration alternatives and the selection of the optimal one, considering a continuous surface mining project. The proposed method is a combination of the analytical hierarchy process (AHP) for the quantification of risk factors and the technique for order of preference by similarity to ideal solution...
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International Journal of Mining and Mineral Engineering
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Geotechnical and Geological Engineering
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Minerals
Spatial modeling and evaluation is a critical step for planning the exploitation of mineral depos... more Spatial modeling and evaluation is a critical step for planning the exploitation of mineral deposits. In this work, a methodology for the investigation of a multi-seam coal deposit spatial variability is proposed. The study area includes the Klidi (Florina, Greece) multi-seam lignite deposit which is suitable for surface mining. The analysis is based on the original data of 76 exploratory drill-holes in an area of 10 km2, in conjunction with the geological and geomorphological data of the deposit. The analytical methods include drill-hole data analysis and evaluation based on an appropriate algorithm, principal component analysis and geographic information techniques. The results proved to be very satisfactory for the explanation of the maximum variance of the initial data values as well as the identification of the deposit structure and the optimum planning of mine development. The proposed analysis can be also helpful for minimizing cost and optimizing efficiency of surface mining...
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International Journal of Mining Science and Technology
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International Journal of Mining Science and Technology, 2017
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Applied Sciences
The estimation of fuel characteristics and spatial variability in multi-seam coal deposits is of ... more The estimation of fuel characteristics and spatial variability in multi-seam coal deposits is of great significance for the optimal mine planning and exploitation, as well as for the optimization of the corresponding power plants operation. It is mainly based on the quality properties of the coal (i.e., Lower Calorific Value (LCV), ash content, CO2, and moisture). Even though critical, these properties are not always measured in practice for all available borehole samples, or, they are generally estimated by using non-parametric statistics. Therefore, spatial modeling of LCV can become problematic due to the limited number of data. Thus, the use of other available correlated attributes might be helpful. In this research, techniques of multivariate geostatistics were used to estimate and evaluate the spatial distribution of quality properties in a multi-seam coal deposit, with special reference to the LCV. More specifically, kriging, cokriging, and Principal Component Analysis (PCA) ...
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Energy resources are distributed in space. Models of spatial variability thus greatly contribute ... more Energy resources are distributed in space. Models of spatial variability thus greatly contribute to the optimal exploitation of such resources. This paper concentrates on modeling the spatial distribution of energy content based on geostatistical interpolation and simulation methods. We focus on lignite, a fossil fuel which plays a key role in the energy budget in several parts of the world. Nonetheless, geostatistical tools are also relevant for the analysis of renewable and other fossil-based energy resources. Quantitative understanding of the spatial variability of lignite energy reserves helps to optimize mine exploitation and to reduce fluctuations in the quality of the fuel supplied to power plants. We also introduce the spatial profitability index as an analytical tool for the design and medium-term exploitation of multiseam mines. Based on this index we propose an empirical equation which allows fast and practical estimation of changes in energy reserves due to variations in expected costs or revenues. We illustrate the proposed modeling framework using lignite data from the Mavropigi mine in Northern Greece.
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17th International Mining Congress of Turkey, 2001
ABSTRACT: This work considers different schemes to assist the need of mining engineers for advanc... more ABSTRACT: This work considers different schemes to assist the need of mining engineers for advanced postgraduate education. The work is conducted İn two stages. In the first stage, a modified Delphi approach is applied to determine the teaching modules that mining engineers consider the most important and useful. Using statistical analysts tools, it İs found that the market that the course addresses can be enlarged to include chemical engineers, metallurgists and industrial chemists, who display similar demand patterns. The second ...
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The objective of the present paper is the investigation of the effect of large technical projects... more The objective of the present paper is the investigation of the effect of large technical projects on the strategic exploitation planning of surface lignite mines with extensive horizontal development. For this purpose, a framework is formulated for the operations management of such projects in a lignite mining center where these projects are associated with the operation of a complex of mines. The model is based on an integrated approach to the long-term strategic mining planning and development, taking into account the latest technical, environmental, economic and social data with regards to the operation of surface mines. The effect of these data on the general mine planning is investigated, aiming at the optimum utilization of the lignite deposit, always considering that large technical projects may necessitate significant modifications-revisions of the mine limits and of its development schedule. In this paper, a model is described for the management of large technical projects ...
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The evaluation of the drill-holes exploratory data for the estimation of exploitable lignite rese... more The evaluation of the drill-holes exploratory data for the estimation of exploitable lignite reserves in multilayer lignite deposits is a very important problem of the lignite industry. The application of mining software needs thorough data organization and analysis, while an efficient geological input and interpretation is required in order to avoid errors in lignite reserves estimation. The objective of this paper is to investigate the procedure for the formation of exploitable lignite blocks, to improve the algorithm for the evaluation of drill-holes layers and to propose a new approach to lignite reserves estimation. From the proposed model, the significant impact of the geological strata correlation is proved, while better lignite reserves estimation results are derived.
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Papers by Christos Roumpos