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Maintenance of the dewatering regions of liquidated mines has a yearly cost exceeding $50 million. The results of research and forecasts conducted allow us to state that, in the dewatering plants operating in the Upper-Silesian Coal Basin, there are possibilities of reducing the general costs by 17% in the perspective up to the year 2030. However, this requires introducing the following changes and modifications: transforming some parts of stationary pumps into deep-well ones while taking into consideration the hydro-ecological restrictions; shortening the longwalls in the stationary pumps; and directing some of the pumped water to the operational mines that neighbor the longwalls of the liquidated mines. The changes presented should mostly be used in order to rationalize the costs of dewatering while maintaining the currently existing package of ecological and social benefits. These benefits are: the minimization of water hazards in the neighboring operating hard coal mines, and the protection of work places in the existing dewatering plants.
Background: The purpose of this study was to design a factor model whose application would refine the diagnostics of actual and continuous states in ice hockey players. Material/Methods: The following batteries of tests were used: Test battery 1 serves as a monitoring tool for the Methods Department of Slovak Ice Hockey Federation. Test battery 2 was designed on the basis of previous empirical evidence. A comparative analysis of the batteries was aimed at the qualitative aspect of the criteria of the individual test items. Results: The results showed partial incompleteness of the battery and a need to complement the battery with test items that would be more indicative of skating performance. The saturation of five factors within test battery 2 demonstrated a hierarchy of individual parameters, which were actually indicative of skating performance. Conclusions: With a high degree of probability, one may conclude the incidence of a common base of running parameters (factor model 1), which despite a different character of loading shared an identical base. This contradiction represents a certain knowledge paradox indicating that the implementation of these items into the test battery does not sufficiently assess general fitness in ice hockey players making their number redundant.
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