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In modern mining a tendency is observed to extend underground development of near open-pit reserves in thick ore deposits because of increase of open-pits ready to complete open mining operations or technical elimination. Researchers of Mining Institute KSC RAS have established that when developing the near open-pit reserves by mining systems of ore and country rock caving, the parameters of ore excavation and mining safety increase due to controlling ore drawing and constructing a thermal insulating layer. The ma...

The paper presents numerical modelling results for ventilating a blind excavation, if there is a leakage into a failure zone. The leakage value of air seeping through the failure zone (binomial law of resistance) was estimated by a formula describing in-situ tests results at the Kola Peninsula mines. The blind excavation ventilation process was simulated based on a previously developed two-stage methodical approach: 1st stage ? calculation of aerodynamics with applying a standard ({k - ?}) -turbulence model; 2nd s...

Depletion of soil fertility due to decrease in soil organic matter content represents a considerable problem in both developed and undeveloped countries. This paper deals with the comparison of compost (Cp) and mineral nitrogen fertilizer (NF) application on selected soil parameters which indicate state of soil environment, its health and quality. The main objectives of this study were (a) to investigate influence of Cp and NF application on total nitrogen (TN) and carbon (TC) content in soil (b), to determine pos...