Vol. 16, Issue 2 (July-Dec 2006)

Abstracts

• Georgios Panagopoulos and Apostolos Alexopoulos (University of Athens, Department of Geology and Geoenvironment, Section of Dynamic Tectonics and Applied Geology, GR-157 84 Athens, Greece): "Hydrogeological conditions in the catchment area of the Lagouvardos stream (Prefecture of Messenia, Greece) and study of flood discharges." Mining & Metallurgical Annals, vol. 16, no. 2, July-Dec 2006, pp. 17-29.

This paper deals with the hydrological and hydrogeological conditions in the Lagouvardos stream catchment area, Messenia Prefecture, Greece. The most important aquifer is formed in the karstified carbonate rocks of Tripolitsa zone and is mainly used for covering the irrigation and part of the drinking demands of the wider area. The Lagouvardos stream transects the carbonate rocks and feeds groundwater to the karst aquifer. Due to the absence of hydrological data for the stream discharge and aiming to studying minutely the hydraulic communication regime between surface and groundwater of the area, we installed two hydrological stations for measuring the Lagouvardos discharge, in which we received systematic and frequent measurements which are required for the construction of reliable level-discharge curves. From these measurements we determined that an annual quantity of about 2.8 × 10⁶ m³ surface water infiltrates and replenishes the water reserves of the Trifilia karst aquifer. Lagouvardos displays a characteristic torrential behavior, with flood events of low duration and relatively high intensity. © Mining & Metallurgical Annals, Hellenic Society of Mining & Metallurgical Engineers, 2006.

• Christos-Triantafyllos Galbenis and Stamatis Tsimas (National Technical University of Athens, School of Chemical Engineering, Section of Chemical Sciences, Laboratory of Inorganic and Analytical Chemistry, GR-157 73 Zografou, Athens, Greece): "Exploitation of construction and demolition waste in cement industry." Mining & Metallurgical Annals, vol. 16, no. 2, July-Dec 2006, pp. 31-47.

The scope of this paper was the possibility of substituting ordinary raw materials that are used in cement industries with recycled materials obtained from buildings Construction and Demolition (C&D) works. The C&D waste that were used were recycled concrete aggregates and recycled masonry aggregates. The chemical and mineralogical characterization of the examined materials certified their applicability in the cement raw materials mixture. This fact allowed their introduction in the cement raw meal in percentages of 20, 40, 60, 80 and 100%. For comparison reasons, a reference cement raw meal (industrial cement raw meal) was used, derived from ordinary raw materials. All generated cement raw meals, were sintered in various temperatures from 1000°C to 1450°C, in order to evaluate their burnability. For all samples, the formation study of the produced clinkers (sintered at 1450°C) as well as the laboratory preparation of Ordinary Portland Cements (OPC)-Type I was done. The physic (setting time, water demand, expansion) and mechanical properties (compressive strength) of the examined OPC were studied. The results showed that the addition of C&D waste in the cement raw meal improves their burnability without affecting the quality characteristics of the produced clinker as well as the generated cements. (Article in Greek.) © Mining & Metallurgical Annals, Hellenic Society of Mining & Metallurgical Engineers, 2006.

• Konstantinos Kavouridis (Technical University of Crete, Dept. of Mineral Resources Engineering, GR-731 00 Chania, Greece), Nikolaos Galitis (Public Power Corp. SA, Kifissou and Dirahiou 89, GR-104 43 Athens, Greece) and Ioannis Karabakakis (Public Power Corp. SA, Liginte Centre of Western Macedonia, GR-502 00 Ptolemais, Greece): "Health and safety management in the open-pit lignite mines of Public Power Corporation SA, Greece." Mining & Metallurgical Annals, vol. 16, no. 2, July-Dec 2006, pp. 49-68.

The safety of employees constitutes for the lignite mines of Public Power Corporation SA (PPC) a goal of utter importance and priority. The employees are the most important factor and the main lever in order to achieve the productivity and development objectives of the mines. Consequently, the efforts of improvement of the conditions for safety in the work, are continuous and aim at the minimisation and, if possible, the elimination of accidents. In the present report on the health and safety management in the mines of PPC, the legislative framework, the regulations-directives, the policies and methods of management addressing risk, the analysis of accidents rates, as well as the relation between production and safety of work are presented. The safety records show that the lignite mines of PPC are among the safest mining operations worldwide. (Article in Greek.) © Mining & Metallurgical Annals, Hellenic Society of Mining & Metallurgical Engineers, 2006.

• Konstantinos Skordas (University of Thessaly, School of Agricultural Sciences, Department of Ichthyology and Aquatic Environment, Fitokou Str., GR-384 46 N. Ionia, Volos, Greece): "Environmental geochemical research on the bottom sediments of the old and the new bed of Pinios River (Thessaly, Greece): assessment of the potential sources of pollution." Mining & Metallurgical Annals, vol. 16, no. 2, July-Dec 2006, pp. 69-80.

A pilot scale geochemical survey of bottom sediments from the Pinios River (Thessaly, Greece) was carried out. The Pinios River mainly receives sediment from the Pindos and Pelagonian Geotectonic Zones. Rocks of these two zones comprise of carbonates, flysch, ultrabasic rocks, molasse and Neogene deposits. These strata do not host any significant sulphide mineralization except the chromite deposits in ophiolites of the Pelagonian zone. The collected samples were analyzed for Cu, Pb, Zn, Ni, Co, Mn, Fe, As, V, Cr and Mg, using inductively coupled plasma atomic emission spectroscopy. The abundance of these elements is discussed in relation to local geological conditions such as bedrock climate, weathering. The concentrations of Cu, Ni, Co, Cr, Mn and V are higher than the corresponding ones of the European River Sediments. Relationships between various elements have been identified from correlation and factor analysis and reflect genetic associations. The first group includes Ni, Co, Fe, Mg and V and reflects the existence of ultrabasic and basic rocks in the surrounding area. The second, third and forth group of elements are due to anthropogenic sources such as fertilizers and urban. (Article in Greek.) © Mining & Metallurgical Annals, Hellenic Society of Mining & Metallurgical Engineers, 2006.

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