Gospodarka Surowcami Mineralnymi - Mineral Resources Management

It was proposed to separate the concepts of reserves (in situ) value and deposit value, where: value of the reserves (in situ) is calculated based on sum of discounted net profit during the time of exploitation, i.e. market value added. value of deposit is calculated according to market value added plus investment expenses. The methodology for both concepts for non-ferrous metal industry were presented in the paper.

In the article there are presented analysis of work effects of OZWR on the basis of blocks of technological operations. It was proposed a distinction of three blocks in all technological copper enrichment system. There was carried out an analysis of demands for energy for individual blocks and on the basis of results obtained a competitiveness assessment of three OZWR districts was also made.

The article presents basic definitions and assumptions of modelling and optimisation method of mining works in hard coal mine with an application of stochastic networks. Presented method could be an useful tool to design process of future mining works in coal mine, according to technical and economical plans.

The paper presents results of examinations of pressure generated by a bed of plasticized coal grains of selected size fractions for nine coals with various coking properties. The examinations were carried out both for conditions of constant volume and of limited expansion of the carbonized coal sample within the temperature range of coal plasticity. The expansion was proportionate to coal shrinkage occurring above the temperature of resolidation, determined with the Sapożnikow test. It was found, that pressure generated by coal carbonized under conditions of constant volume depends on its coking properties and the size of coal grains. It should be emphasized under such conditions, high coking pressure can be generated by coals with appropriate coking properties, characterized by both high and relatively low content of volatile matter. In the case of carbonization of coals under conditions of limited expansion, only the coal H. Robert with a relatively low volatile matter content and moderate dilatation capacity could generate coking pressure. It should be stressed that it is this type of coal that ought to be regarded as a dangerous component of coal blends which can cause damage of the brickwork of coking chambers and hinder coke pushing.

The uncontrolled methane rises to the ground surface within the Ostrava Trough (ODP) and the Petłvald Trough (PDP) (the Czech part of Upper Silesian Coal Basin) are connected with the transient (PDP) or quasi- stationary regime (ODP) of fluids within the anthropogenic influenced hydraulic conditions of the Carboniferous massif-attributed to the effect ofmining exploitation closure. Such a situation create a long-lasting hazard to the natural environment, man's safety and property. The methane rises to the ground surface within the Polish part of the USCB are not such a significant problem yet. Future liquidation ofcoal mines however, should be preceded by preparation of sufficient prevention against this phenomena. The preferred solution is the active, controlled degassing, and lowering the pressure in the vadose zone, above the water level within the flooded mining areas.

In article influence of securitization as a source of capital on selected financial indicators is presented. When the company destine cash for investments or repayment debts. In article were presented financial indicators, on which securitization influences and may improve the value.