Dragan Krasić

Floating slopes method application on the coal deposit Kongora

Developing three-dimensional geological and economical models of deposits in combination with deposit economical values calculations, represent fundament for application of contemporary methods in the mining engineering. It is proved that contemporary methods, such are Lerchs-Grossmans method, Method of floating cone and Dynamic programming, are excellent models for generating the algorithm for contour optimization of an open pit mine. The exploration of the optimal pit contour can be relatively simple and fast process if specialized mining software are utilized. The simplicity, quickness and reliable results offer a wide range of contemporary methods applications built-in in many mining computing programs. Based on available contemporary methods and their elementary criterias (optimality, stability and slope stability), authors suggest an innovative method of open pit contour optimization, named Floating Slopes Method (FSM). This paper presents synthesis of results of FSM application on the coal deposit Kongora.

The characteristics of the production and processing of oil and natural gas in Croatia from 2000 to 2014

During the early stages of the Middle Miocene transgression marine biota invaded the newly formed Paratethys Sea. Reefs and reef-like structures particularly flourished with life, supported by the favourable climate conditions. Miocene biogene buildups show a variety of fossil assemblages and lithologic features. The main reef-builders were bryozoans, coralline algae, corals, oysters, vermetids, sponges and serpulids. Water turbidity and depth were major ecological factors controlling the reef biota. Lithofacies types at the studied localities in Northern Croatia show significant similarity with the Upper Langhian (Middle Badenian) of the Leitha Mountains in Austria, but can also be well compared with Miocene to recent reef structures in the Mediterranean. The Miocene reef-like buildups exhibit different porosity rates and other lithological characteristics.

EVALUATION OF RESEARCH IN BAUXITE-BEARING AREA ON A LOCALITY „CRVENE STIJENE“ WITH EMPHASIS ON EXPLOITATION OF ASSOCIATED DEPOSITS

In this paper we present and elaborate one example when bauxite was the main target of investigation. During reprocessing and reinterpreting original input data from locality “Crvene stijene” near Jajce in Bosnia and Herzegovina, it was established that bauxite hanging wall and footwall rocks in fact present even more valuable mineral resources, dimension stone. This paper presents results of reprocessing and reinterpretation of original data with focus not only on primary resource, but on resources that are developed in footwall and hanging wall. Final goal of the research was to optimize the ratio between research and exploration cost and total profit by exploration of all available mineral resources in the area. For that purpose, new method of bauxite (primary resource) and associated deposits is developed and named “integrated approach”. Integrated, joint evaluation of bauxite and associated deposits (dimension stone), would give far greater significance to whole area. Finally, with this new method, the ratio between overall profit and cost will be maximized.