This paperwork gives an analysis of reversal motion of the belt conveyor in the case of its stoppage in the example of a belt conveyor for ore at the open pit “Veliki Krivelj”, with capacity of 2000 t/h with inclination in material transport direction. The analysis was made by the calculation procedure using the “contour bypass” method, which is a universal calculation method for conveyor belt calculation, whose results are indispensable for the selection of backstopping device of belt conveyor. Also, the principal of operation and technical characteristics the selected backstopping device are stated.

This paperwork gives an analysis of reversal motion of the belt conveyor in the case of its stoppage in the example of a belt conveyor for ore at the open pit 'Veliki Krivelj', with capacity of 2000 t/h with inclination in material transport direction. The analysis was made by the calculation procedure using the 'contour bypass' method, which is a universal calculation method for conveyor belt calculation, whose results are indispensable for the selection of backstopping device of belt conveyor. Also, the principal of operation and technical characteristics the selected backstopping device are stated.

The aim of this paper is to identify potential exposure of the workers in the coal mine Tusnica. The results of the investigation showed increased activity of brown coal up to 1060 ± 88 Bq kg(-1) for (238)U, 976 ± 30 Bq kg(-1) for (226)Ra and 118 ± 31 Bq kg(-1) for (232)Th. Dose rate measurements ranged from 0.07 to 0.25 µSv h(-1). The annual effective dose, taking into account external exposure to ambient gamma radiation and internal exposure due to inhalation of the resuspended dust, would be 1.6 mSv a(-1). The results presented lead to the conclusion that Tusnica coal mine contains brown coal with significant radioactivity, indicating that the working hours in the area should be regulated and the use of respiratory protective equipment is obligatory.

This work presents the adaptation and verification of existing equipment for flotation and cleaning with regrinding of smelter slag, based on the proposed technological-technical solution and results of technological investigations of process in laboratory conditions and carried out techno-economical analysis. The work was done regarding to the project task, technological project and supports obtained from the investor, according to the current technical regulations and rule books on project content. .