engleski

Spatial analytical set of methods applied in the cement raw material deposit, case study exploitation field “St. Juraj – St. Kajo”

Presented research included testing of normal distribution of input data and creating interpolation maps of chemical components as well as cement modules and compared the two approaches for the volume calculation of cement raw material by geological sections and structural maps. The researched area was the exploitation field “St. Juraj – St. Kajo” of raw material for cement production in Southern Croatia. The deposit is situated in Eocene flysch where are seven different lithological units which had been divided technologically based on the proportions of chemical compounds. Based on input data number (from 7 to 36) in total 144 normality tests (Kolmogorov-Smirnov and Shapiro-Wilk) were applied for the chemical analyses (CaO, SiO2, Al2O3, Fe2O3, MgO, SO3, Na2O, K2O, CaCO3) and cement modules (lime saturation factor (LSF), silicate module (SM), aluminate module (AM)) in the lithological units. The interpolation had been performed by the Kriging and Inverse Distance Weighting, mapping CaO (%), SiO2(%) and LSF (-). The interpolation methods had been selected based on normality test passage and the amount of data. The analysed lithological unit for volume calculation was technologically homogeneous but contains interlayers (lenses) of different characteristics which affect the material’s quality. Using geological sections for volume calculation is based on the block volume between two parallel vertical sections which is obtained as a product of the mean areas of adjacent sections multiplied by the distance between them. Structural maps represent the calculation of the volume of the observed object under a function f (x, y) defined by a double definite integral. The results of the comparison of the two mentioned approaches for the calculation of the volume of cement raw material for exploitation showed that in this case both approaches are suitable for future use for the purpose of planning the future exploitation of the analysed raw material.

cement raw material ; flysch ; interpolatin maps ; geological section ; structural maps

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