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Recurrent annual regularities of the level of production and sales of hard coal in the Polish market result in the coal companies facing the surplus of production in the, so called, slack season, as well as shortages of coal in the season of increased demand for coal. At present mining companies solve this problem by outsourcing mining workers. However, this is not the most favourable solution because of the negative approach of the mine workers towards this kind of practices. Moreover, planning of employment is c...