Specific characteristics of iron ore deposits in Ljubija ore region are given by pelitoid iron ores (,,brand“) which occupy a substantial part of iron mineral resources, on which industrial production of natural iron oxide – pigments depends. This particular technology type of iron ore deposits, until recently was waste from mining production, and now when it is possible to implement new technological processes, that waste became an important commercial product. This paper presents the results of detailed geological research which lasted for a few years, as well as laboratory and tehnological tests. It presents the new data on the metallogenetic characteristics of the environment where iron oxides originate as a raw material for mineral pigments. In this paper, we answered and resolved dilemma about brand identity in adequate genetic iron types in Ljubija mining regions, about their specificity as well as the ore formations and geohistorical development. Through the technological characterization of the ore and its domain of application, we provide the basis for economic evaluation of the deposits of this very important mineral resource.

Getting coal using mechanized longwall on the principle of horizontal concentration in a single procedure, it can be successfully applied in mining coal seams very small thickness. For high calorific coal thickness of coal seam that can be successfully excavate this method is approximately 1.0m other coals to 5.0 m.Result of extensive laboratory research presented in this study are related to the possibility of mechanized exploitation (mining application longwall) coal seams in the mine "Lubnica".

Using of explosives in modern mining is very important for the good, efficient and rational organization for obtaining of solid minerals, especially in the exploitation of mineral resources on mines with large capacities. Technological phases of drilling and blasting in the exploitation process are very important in this case, and the analysis in this paper, because specific working environment and technical construction-limestone, where performance and capacities for further technological stages largely depends on the granularity of blasted materials (capacities of bulldozers, capacities of loadersexcavators, capacities of trucks and equipment for stone crushing and grinding). Objective of this paper is to get the best drilling and blasting parameters with different combinations of explosives, to get an optimum combination that will be continusly used.

Miljanović, J. et al: Definisanje maksimalnog ...... Arhiv za tehničke nauke 2012, 7(1), 35-42 Tehnički institut Bijeljina. Arhiv za tehničke nauke. Godina . Izbor optimalne nosivosti podgrade kao i tipa i konstrukcije je još uvek jedno od najvažnijih pitanja a pouzdan izbor je moguće izvršiti samo na bazi osnovnog poznavanja geomehaničkih karakteristika radne sredine, kao i karaktristika mehanizovane hidraulične podgrade.Obzirom da fizičko-mehanička svojstva stenskog masiva direktno utiču kako na izbor tipa i konstrukcije mehanizovane hidraulične podgade tako i na veličinu koraka napredovanja MHP neophodno je izvršiti modeliranje stenskog masiva.Ključne reči: eksploatacija, ugalj, mehanizovana hidraulična podgrada THE MAXIMUM STEP ADVANCEMENT DEFIWING WITH MECHANIZED HYDRAULIC ROOF SUPPORTS (MHRS) WITHIN CONDITIONS OF MINE "STRMOSTEN"ABSTRACT Interaction between mass and mechanized hydraulic roof supports (MHRS) in underground exploitation is one of the primary conditions of (for) successful implementation of MHRS during coal especially when we have complex conditions in underground coal exploitation.One of more important question about supporting is to choose optimal construction and the best type of MHRS and we can make right choose if we know geomechanical characteristic of massive and if we know all characteristic of MHRS.

In the modern mining, best efficient organization by obtaining solid minerals, is getting with explosives utilization for blasting, with the growth of significance in the exploitation of mineral resources in the open pit mines with large capacities. In this paper technological stages of drilling and blasting, that are demanding from the technological aspect, had been economicaly analyzed, because of the specific working environment by limestone quarries. The aim is to arrive the optimal combination (with the technological and economic aspects) of explosives in an explosive charge that would be used in the future work of the quarry, where technical-technological efficiency follow and economical organizing of completely production process.