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Large scale mining as a method of extraction of mineral raw materials have a growing application with the aim to increase the quantity of blasted mass, and to reduce costs of production as well. Increasing the quantity of blasted mass requires the use of large amounts of explosives, leading to an increase in the negative effects of mining. Under negative effects of mining the seismic effect of blasting, effect of air waves, sound effect, scattering the blasted rock mass, and similar are assumed. In order both to evaluate and control the seismic effect of blasting, as well as to plan it, the determination of soil oscillation law is required, with the strike: mine field - facilities to be protected. One of the most commonly used equations is that of M.A. Sadovski defining the law of alteration in the oscillation velocity of the soil depending on distance, explosive amount, and conditions of blasting and geologic characteristics of the soil, being determined on the basis of test blasting for the specific work environment. The Sadovsky equation is determined based on trial minings for a specific work environment. In this paper, a special attention was paid to the seismic effect of blasting. In accordance with this, an analysis of the method for determining the soil oscillation law parameters, proposed by the Russian professor M.A. Sadovsky, was performed. For determination of parameters in the Sadovsky equation, in addition to the usual model - the least squares method, one more model is shown with the use of Lagrange's theorem. Thereby, it has been stated that both models can be used to calculate the oscillation velocity of the rock mass.

This paper gives an analysis the method for determining the parameters of soil oscillation law, suggested by Professor M. A. Sadovski as well as the level of its applicability for blasting with commercial explosives for the needs of mining and other economic activities. The applicability of this law was analyzed on examples of mass blasting at the Open Pit 'Drenovac' that are carried out for deposit mining. As the relation between the soil oscillation velocity and basic parameters affecting its magnitude, are the following: the amount of explosive, distance from the blasting site, characteristics of the rock material and type of blasting, the equation of M. A. Sadovski, where the oscillation velocity v is given in the form of of the function, is most frequently used: v = K . R-n , where R is reduced distance, and K and n parameters conditioned by soil characteristics and blasting conditions, thereby v is decreasing and convex function of variable R. To determine parameters in the equation of Sadovski, in addition to the common method of least squares, another model was applied. There by, it has been stated that both models can be used to calculate the oscillation velocity of the rock mass.

Coal presents the basic energy potential of the Republic of Serbia. More than half of electric energy production in our country comes from this resource. This causes a need for activation the new seams of raw material which are potentially exploitable. This work presents an extract from the research results, published within the Project TR 33029 'Study of Possibilities for Valorization the Remaining Coal Reserves with a View to Provide the Stability of Energy Sector of the Republic of Serbia', financed by the Ministry of Education and Science. This work treated the problems of future coal exploitation from the West Morava Basin, with special review to the activation of the closed mine 'Bajovac'.