Improving the methods for determining the promising boundaries of iron ore open pits

Abstract

The article considers the determination of the final contours of the open pits. One of the problems of development of iron ore deposits at the present stage of development of opencast mining is described, which consists in the fact that in most open pits their working contours on the surface have reached final position. In these conditions, it is necessary to reevaluate the capabilities of the raw material base for further operation of mining enterprises. The analysis of scientific achievements in the decision of the final definition of the open pits` contours is executed. The well-known principle of determining the boundaries of opencast mining, the principle of which is to determine the boundaries based on a comparison of the allowable cost of ore production with the expected for the designed open pit. On the example of the open pits, which reflect the characteristic features of the development of steep-dipping deposits of Ukraine, the influence of current overburden ratio of the existing open pits on the economic overburden ratio, which serves as the main criterion in determining the boundaries of opencast mining for the designed open pits. A method for determining the boundaries of the open pits has been developed, which provides for the use of the economic overburden ratio of opening as a value not constant but variable over time, and one that depends on the change of current coefficients of opening in open pits-competitors. As a result, the theory in the field of determining the final contours of the open pits is improved. The new method differs from the known ones by taking into account the change in the economic overburden ratio over time, as well as determining the impact of technological indicators of open pits - competitors on the final depth of the designed open pit.

Study of hydroerosion process parameters of zeolite-smectite tuffs and underlying rock

“…The Rivne-Volyn region of Ukraine is rich in deposits of zeolite-smectite tuffs, which are of great interest to the industry of Ukraine. Currently, their industrial extraction is not carried out, however, in the development of basalt deposits, in particular (Berestovetske deposit, Ivano-Dolynsk basalt deposit (Rivnen district), Rafaliv basalt deposit (Varas district)), tuffs are the host rock, and, as a rule, when loading the blasted basalt mass for processing tuffs are sent to the dump [6][7][8][9].…”

Research of land-saving schemes of mining the horizontal sedimentary mineral deposits

“…Open pit mining is associated with significant disturbance of arable land [1][2][3][4]. In particular, an area of 600-1,800 hectares is disturbed by one mine developing a horizontal deposit [5][6][7][8], which is subject to reclamation after the deposit exploitation [9][10][11][12]. At the same time, 80-85% of the total area of disturbed lands may be returned to agriculture [13][14][15][16].…”

“…In particular, an area of 600-1,800 hectares is disturbed by one mine developing a horizontal deposit [5][6][7][8], which is subject to reclamation after the deposit exploitation [9][10][11][12]. At the same time, 80-85% of the total area of disturbed lands may be returned to agriculture [13][14][15][16]. The other 15-20% are disturbed by trenches [17][18][19][20], and the capital trench accounts for up to 80% of this area [21][22][23][24].…”

Enhancing the adaptability of a mining complex in a dynamic environment by utilizing the technology for the development of a man-made deposit with a mobile ore preparation complex

“…The economic conditions of mining operations are also characterized by significant dynamics: the price and demand for the products of mining enterprises changes [1], which leads to a change in the minimum industrial content of a useful component. Due to their inertia, open-pits, as large production systems, cannot adapt their production indicators to economic conditions quickly and efficiently [2][3][4][5]. At the same time, its timely increase is possible due to the development of man-made deposits of iron ore raw materials accumulated over the past decades.…”