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Mineral fuels are among the non-renewable natural resources. For this reason, would be addressed in a responsible and rational use. Mineral fuels are among the so called strategic raw materials, the use of which is essential to the national economy and energy security. Raw materials base in Slovakia as regards energy raw materials consists mainly of brown coal, lignite and uranium, part of the oil and natural gas. To determine the prospects for the use it is necessary to know the quantity of reserves and the econo...