Browsing by Subject "deposit parameters"

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Access status: Restricted ,
Geostatystyczne badanie anizotropii zmienności parametrów złoża węgla brunatnego „Gubin”
(Data obrony: 2010-09-30) Nieckula, Monika
Wydział Geologii, Geofizyki i Ochrony Środowiska
Lignite is at present the only fuel which can ensure that Polish economy is self-sufficient and energy secure. One of the most prospective deposit of this raw material is the bedded deposit „Gubin”, situated in the south-west part of Lubuskie province. In this work an attempt to recognise the spatial variability of lignite deposit parameters, i.e. the ash content (Ad), sulphur content (Sdt), calorific value (Qri) and seam thickness, was made for two balance beds in the Gubin deposit. The analysis was conducted on the basis of data coming from a geological documentation from 1969. The characteristic of variability structure conducted geostatic with the use of semivariograms, clearly proves the anisotropic variability of the ash and sulphur content and the isotropic variability of seam thickness and calorific value. In order to verify the results they were compared with the results of analyses based on other deposits of the same raw material. Similarities in the variability structure of the comparable parameters were found.
Access status: Open Access ,
Identyfikacja parametrów wpływających na efektywność drążenia wyrobisk korytarzowych w kopalniach węgla kamiennego
(Wydawnictwa AGH, 2010) Sobczyk, Eugeniusz J.
The work includes an analysis of heading development process in selected Polish hard coal mines. An analysis of average tunnel development face advance and cost was done for 838 headings driven in coal mines in the years 2003-2008. A new methodology for conducting development work efficiency assessments at hard coal mines was proposed. Two structural models of heading development work efficiency were determined: the first one basing on the achieved face advance rates, the second - on the achieved financial results. The results served to formulate aggregate indexes (Wp - aggregate face advance index, We - aggregate cost index), which comprehensively measure the influence natural hazards, deposit parameters and technological parameters have on limiting tunnel face advance rates achieved as well as on development costs. An attempt was made to calculate the optimal heading drivage rate at a minimum cost for each range of the efficiency index We. Average face advance and average face financial results were also described. In analysis a cost structure of heading development with the division into coal, coal-stone and stone face was taken into consideration.
Access status: Restricted ,
Wiarygodność oceny parametrów złożowych i zasobów złoża w różnych etapach jego rozpoznania na przykładzie fragmentu złoża węgla brunatnego Gubin
(Data obrony: 2013-12-18) Pruś, Ilona
Wydział Geologii, Geofizyki i Ochrony Środowiska
The main objective of the study was to examine the evaluation of reliability seam thickness, ash content, calorific value and total sulfur content in three stages of deposit recognition on the basis of Gubin brown coal deposit. The boundaries of the deposit and erosion channels were determined on the basis of indicatory type of minimum curvature method. Ordinary kriging method was used to estimation of the resources parameters value in different stages of exploration of the deposit. Relative estimation errors of calorific value, ash content, and seam thickness determined on the basis of differences between estimated values in various stages of recognition of deposit in more than half of the deposit area are in the range of-10 to + 10%. Estimation errors in other area exceed a value of 10% and for ash content up to +-50% and in the case of thickness to about 70%. The least accurate characterized the total sulfur content estimation with errors reaching up to a value of -50 to 100%. Area estimation error based on boreholes outlying about 800 and next about 600m decreases the error of 15 to 8% and for resources from 11 to 7%.