engleski

Cement raw material reserve calculation – geological sections vs. structural maps approaches, case study from Southern Croatia

This study aims to compare two approaches for the reserve calculation of cement raw material by geological sections and structural maps. The first one is legally based and its accuracy is approved by periodical calculation of the exploited material on site. In this research it was crucial to determined deviation in calculation approach, i.e., geological section volume calculation versus the volume obtained as a software solution estimated as a number of cells between two structural maps, i.e. maps interpolated at the top and bottom of the analysed lithological unit. Due to complex mineralogy, cement raw needs different energy consumption that directly affects the procedure of cement production, e.g., increases air pollution through CO2 emissions. The research area was the exploitation field “St. Juraj – St. Kajo” situated near the town of Split, region of Dalmatia, Southern Croatia. In the deposit, there are seven different lithological units, and all had been technologically divided based on their chemical compounds. The lithology included dominantly marl and sand- stone with occasionally alternations of the conglomerate. Although in the geological sense it is con-sidered as single unit, it partially contains interlayers in the form of lenses such as limy (calcitic) marl, calcsiltite (clayey limestone) and clayey marl. Generally, the knowledge of interlayers’ exist-ence it is more important than their exact quantity because it affects expectations of a nonuniform material’s technological quality at the location. For purpose of the analysed lithological unit calcu-lation, the volumes of the interlayers within were determined as well. Using geological sections for volume calculation is based on the calculation of the block volume (V) between two parallel vertical sections (P1, P2) which is obtained as a product of the mean areas (Paverage) of adjacent parallel sections (P1, P2) multiplied by the distance between them (d). Structural maps represent the calcu- lation of the volume of the analysed object under a function f (x, y) defined by a double definite integral. Comparison of research results encourages the use of software solutions for the volume calculation of cement raw material volume in the future.

reserve calculation ; cement raw material ; flysch ; geological section ; structural map ; trapezoidal rule ; Simpson's rule

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