National Repository of Grey Literature 8 records found  Search took 0.00 seconds. 
Obtaining data from the deep horizons of the Rožná Mine
Bukovská, Z. ; Bohdálek, P. ; Buda, J. ; Dobeš, P. ; Filipský, D. ; Franěk, J. ; Havlová, V. ; Chabr, T. ; Knés, I. ; Kryl, J. ; Kříbek, B. ; Laufek, F. ; Leichmann, J. ; Navrátil, P. ; Pořádek, P. ; Rosendorf, T. ; Soejono, I. ; Sosna, K. ; Souček, Kamil ; Šustková, E. ; Švagera, O. ; Vavro, Leona ; Vavro, Martin ; Veselovský, F. ; Waclawik, Petr ; Zuna, M.
This report summarizes the work and partial results made under the Public Procurement Obtaining Data from the deep horizons of the Rožná Mine in the first phase of the third and fourth subdivisions from February to November 2018. These are in particular technical works (boreholes, access to corridors),seismic measurements, sampling for laboratory analysis (physical-mechanical properties of rocks, breakage fills, bearing revalidation), structural characterization of the rockanalytical work on all samples taken. Parallel to these works3D models are being prepared, especially data preparation for modeling.
Obtaining data from the deep horizons of the Rožná mine - realization project of work
Švagera, O. ; Bukovská, Z. ; Souček, Kamil ; Vavro, Martin ; Waclawik, Petr ; Sosna, K. ; Havlová, V. ; Zuna, M. ; Jankovský, F. ; Filipský, D. ; Chabr, T. ; Navrátil, P. ; Mixa, P. ; Soejono, I. ; Laufek, F. ; Kříbek, B. ; Leichmann, J. ; Zeman, J.
Realization project summarizes the planned work, its progress and continuity within the environment of Rožná I mine in the extent of the procurement „Získání dat z hlubokých horizontů dolu Rožná“ which is being compiled by Hluboké hluboké horizonty Rožná group. The final goal is to clarify the significance and spatial influence of major tectonic fault on surrounding rock mass. The results will help to clarify localization and safety issues of the potential deep underground repository, especially with respect to the Kraví hora locality.
Fate of smelter dusts in temperate and semi-arid soils
Ettler, V. ; Jarošíková, A. ; Mihaljevič, M. ; Kříbek, B. ; Veselovský, F. ; Penížek, V. ; Vaněk, A. ; Šráček, O. ; Matoušek, Tomáš ; Mapani, B. ; Kamona, F. ; Nyambe, I.
Our results indicate that, compared to semi-arid areas (where inorganic contaminants are rather immobile in soils despite their high concentrations), a higher potential risk exists in smelter-affected humid areas, where metal(loid) contaminants can be easily released by extensive weathering of particulates in the soil systems.
Mineralogy of particulates from semi-arid soils polluted by mining and smelting and their transformation/re-mobilization during bushfires
Tuhý, Marek ; Ettler, Vojtěch (advisor) ; Kříbek, Bohdan (referee)
This thesis is focused on biomass-containing topsoils from a highly contaminated semi-arid area in the vicinity of mining and smelting operations in Tsumeb and Kombat in the northern Namibia. The highest concentrations of inorganic contaminants were found in samples from Tsumeb and attained the following values (mg/kg): As 1920, Cd 81, Cu 5840, Hg 7,66, Pb 4880, Sb 266, Zn 3310. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and electron microprobe analysis (EPMA) have been used for determination of mineralogical composition of particulates adhering to surfaces of biomass and occurring in the heavy mineral fraction of topsoils. Quantitative partitioning of contaminants within individual mineral phases has been determined using autoSEM; contaminants were mainly bound in the slag glass (As: 16.7 %; Cu: 12.7 %; Pb: 26.2 %; Zn: 33.9 % of total concentration) and in metal(loid)-rich Fe-hydroxides (As: 14.4 %; Cu: 7.7 %; Pb: 21.6 %; Zn: 32.5 %). On biomass- rich topsoil samples, we have experimentally proved that bushfires can be responsible for transformation and re-mobilization of contaminants. Mercury is completely released at temperatures around 300 řC. In the same temperature range, also As anad Sb are released due to arsenolite (As2O3) thermal degradation. Cadmium is released...
Contamination of floodplain of the Ploucnice by heavy metals: relation to its architecture
Hošek, Michal ; Goliáš, Viktor (advisor) ; Kříbek, Bohdan (referee)
Summary: This thesis is focused on mapping of contaminants released into the environment probably due to uranium mining. These chemical contaminants are used to reconstruct the sedimentary processes. The aim of the thesis was both the geochemical assessment of the situation in the catchment area of the Ploucnice River in Boreček using the flood sediments from the research points as sedimentary archives pollution for last decades. With depth profiles, gamma wire log, XRF and enrichment factors (LEF), we have tried to perform chemostratigraphic correlation of the sediments. As target elements U, Ba, Zn and Ni were chosen, whose concentrations are related to the grain size of the sediment. Furthermore, the theory of secondary pollution is developed.
Contamination of foodplain of the Ploučnice river by heavy metals: relation to its architecture
Hošek, Michal ; Goliáš, Viktor (advisor) ; Kříbek, Bohdan (referee)
Summary: This thesis is focused on mapping of contaminants released into the environment probably due to uranium mining. These chemical contaminants are used to reconstruct the sedimentary processes. In the thesis we evaluate geochemical situation in the catchment area in the locality Borecek (part of the municipality Ralsko) using the overbank sediments as sedimentary archives of pollution during the last decades by elements U, Ba, Zn, Ni and 226 Ra. A map of aerial survey of gamma activity was used to select the area of interest, for more accurate localisation we used a surface gamma spectrometry. On Borecek we retrieved ten depth profiles of alluvial sediments (up to 230 cm) and one in Mimon, all samples were subjected to X-ray fluorescence spectral analysis (XRF), across the floodplain we performed gamma wire logs. For interpretations of floodplains architecture electrical resistivity tomography (ERT) was used and selected profiles were analysed for the activity of 226 Ra and 210 Pb. Interrelation of 226 Ra and Ba proved that radiobarite is the main source of the gamma activity. 210 Pb / 226 Ra ratio was used as sediment age indicator. With enrichment factor (LEF), we performed chemostratigraphic correlation of the sediments, for that the concentration of the target elements is corrected for varying...
Experimental investigation of copper smelter fly ash dissolution in a tropical soil
Petráňová, Veronika ; Ettler, Vojtěch (advisor) ; Kříbek, Bohdan (referee)
In a laboratory pot experiment we investigated a time-dependent release of contaminants from smelter dusts into the soil water and soil. In the experiment we used smelter dusts from two different Cu smelters located in Copperbelt in Zambia (Mufulira and Chambishi). Experimental bags with 0.5 g of dust were placed into pots with 200 g of uncontaminated tropical soil (oxisol) and studied in a time frame of 504 h. Pots were irrigated by deionised water and maintained at the 80 % water holding capacity (WHC). Ten samplings of pore water were performed using the Rhizon pore water samplers. In soil waters, the major released contaminants were Cu, Co and Zn. Concentrations of Cu and Co in soil waters C (from soil with the dust from Chambishi) and M (from soil with the dust from Mufulira) increased during first 48 and 216 h, while concentration of Zn reached highest value in soil waters C and M in 24 and 144 h. This trend has not been observed for Pb, which was released in small amounts and obviously bound to soil constituents. Together with metals, sulfates were highly released into soil waters and affected the speciation of metals (formation of sulfate complexes). Compared to mass loss of the dust from Chambishi with low value (8%), the mass loss of dust from Mufulira after pot experiment were...
Evolution of ore-forming fluids along the Rožná-Olší shear zone, Bohemian Massif, Czech Republic: Implications for local uranium deposition and comparison with U-mineralization at Schlema, Erzgebirge, Germany
Hein, U. ; Lehman, B. ; Kříbek, B. ; René, Miloš
The late-Variscan primary uranium mineralization was precipitated from low-salinity aqueous solutions at epithermal conditions. The overall temporal evolution of the ore forming fluids is identical with that of polymetallic vein-type systems in large parts of Western and Central Europe.

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