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In order to work in a mine, two main requirements have to be met roof and ground support and ventilation support. Roof and ground support is important because in case of an accident, workers can, without problems, evacuate the mine. However, besides roof and ground support, in order to fulfill normal working conditions inside the mine, a ventilation system is a valuable and key part of the working process. This paper represents the ventilation system in the Portuguese mining company Almina. It encompasses a ventilation system in the underground and on the surface. The main problems of a ventilation system are discussed, as well as a short scheme of fresh air inhalation and stale air exhalation outside the mine. The result of the paper was to figure out how the ventilation system operates in practice. The aim of the paper was to present a real ventilation system by taking into consideration the fact that there are no mining companies in the Republic of Croatia where people could learn facts of mining companies and ventilation systems, which is very important in case of dangerous situations.

A ventilation system in the Portuguese mining company Almina