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The authors have revealed particularities in destruction of the rock mass by the system of borehole charges and substantiated the least seismic hazardous blasting schemes which allow decreasing out-contour disturbances and providing more qualitative crushing of rock mass. It has been shown that for the boreholes with 250 mm diameter the least seismic hazardous blasting scheme is one with borehole line placed at the angle of 105? to the bench wall. At that, the stress level in the out-contour rock mass decreases by...

Lignite open pit mines have large extent, the excavating and stacking equipment are far one from other, the conveying equipment ale very long, so, the face / mine managers have to record a big amount of data when making daily/weekly/monthly inspections. Also, they are critical inspection points, which are moving with the face's advance. The paper deals with a method and procedure of using smart phones with GPS for taking photos, which are after inspection geo-referenced on the mine plan and on the maps. The author...

The performances of the excavation machines depend largely on the tool and overall machine characteristics and on the other hand on physical mechanical characteristics of the excavated rock. There were more theories based on analytical deductions to explain the main cutting parameters on the basis of basic physical mechanical properties of the excavated rock. In this paper we use a new methodology, based on reliable laboratory data, which make possible to obtain correlation and regression formulas in order to pred...