The paper presents results of research of engineering geological and geomechanical characteristics of the open pit coal mine Dimnjače. Detailed engineering geological and geomechanical research was conducted in 1981 and 1988, and the additional in 2016 and 2019. Based on the results of engineering geological mapping of the terrain, exploratory drilling and laboratory tests, the heterogeneous geological-lithological structure of the terrain was determined. In the area of the coal deposit, when it comes to recent engineering-geological processes in the eastern part, where the elevation of the roof of the coal seam is closer to the surface, landslides and smaller ditches are noticeable, as well as colapses (subsidence) in the southeastern and southern part. One of the causes of slope instability in the eastern part of the deposit is a very pronounced angle of the existing slope. It should be mentioned that the old underground mining works significantly disrupted the natural structure of the deposit and stability of the slopes, which is directly related to the safety of employees and mining machinery when working on coal exploitation.
This paper presents study results of the qualitative characteristics of coal deposit Kotezi. Regional geological researches were conducted from 1983 to 1987, and detailed from 2014 to the end of 2018. Tests were performed on the following coal quality parameters: average thickness of pure coal in coal layers, total moisture content, ash content, total sulfur content and lower heat value. Researches were conducted in the field, laboratory and cabinet. Subsequently, an analysis and interpretation of the obtained research results was carried out. Comparing the research geological results of all represented coal layers, deviations of the considered parameters were determined. Coals of the Bugojno basin belong to the younger coals, soft to medium hard, no luster (matt), brown to black colored, and have brown streak. Their fracture is plate-like and particleboard. They do not have a distinct lignite structure, except in the lower layers. With their general habitus, they resemble younger brown coals, and belong to humic coals which are relatively low in carbonation. In the vertical profile of coal layers, the highest quality components are from the upper part of the layer, while the slightly lower quality components are from the middle and lower parts of the layer.
This paper presents research results of the Bugojno coal basin, which contains very significant, but still insufficiently explored lignite reserves. Based on the determined borders of surface distribution and the research results in the northwestern part of the Bugojno coal basin, proved are four coal layers with reserves of over one billion tons of coal. Discussed are geological characteristics of coal layers, their qualitative-quantitative characteristics, spatial potential of deposit and classification of coal layers. Considering the raw material potential and the possibility of expanding the existing raw material base, the Bugojno coal basin has particular importance for the long-term development of lignite exploitation and its use for thermal energy purposes.
The paper presents results of detailed geological research of quartzite in the wider area of Smrčevice, southeastern of Gornji Vakuf-Uskoplje. Based on the defined boundaries of surface distribution and research results, geological reserves of about 12 million tons have been determined in the wider area of Smrcevica. The quartzite reserves that have been so far determined in this area are at a low level of geological research. The paper contains an overview of the geological characteristics of the area, qualitative and quantitative characteristics of quartzite, and the mineral raw material potential of quartzite in the Smrčevice area according to the PERC standard. The results of the conducted research indicate that the general geological and technical-exploitation factors are relatively favorable and indicate a possible profitable exploitation of the deposit. Taking into account the significant raw material potential, and the possibility of expanding the existing raw material base, this area has special importance for the perspective development of quartzite exploitation and its use in the production of ferrosilicon and silico-metals.
This paper presents the results of detailed geological investigations of the Middle Triassic dolomite deposit of Nikolin Potok, which is located west of Bugojno. Based on the established borders of surface distribution and research results, geological reserves of about 4.6 million m3 have been determined in the wider area of the deposit. The dolomite reserves that have been established so far in this area are at a low level of geological exploration. For this reason, the level of research should be significantly increased, because the calculated and confirmed reserves are very modest compared to the potential possibilities. The paper contains a description of the geological characteristics of the area and the qualitative-quantitative characteristics of dolomite. The results of the conducted research point that the general geological and technical-exploitation factors are favorable and indicate profitable exploitation of the deposit in the coming period as well. Taking into account the significant raw material potential, and the possibility of expanding the existing raw material base, this area has a special significance for the perspective development of dolomite exploitation and its use in the production of technical-building stone.
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