The air current in deeper mines is stronger in winter than in summer. Whereas in summer the air current normally flows In from the opening at the higher elevation through the mine to the lower opening, this flow pattern reverses direction In the winter months (see Fig. Natural ventilation results primarily from differences in temperature (and therefore air density), and secondarily from variations in humidity and air pressure, between the inside and outside air. In special cases, natural ventilation can also temporarily occur in deep mines with two shaft or roadway openings of the same elevation. Natural ventilation is possible when a mine has at least two openings located at different topographic elevations. The natural mine ventilation is a natural air current which automatically replaces the mine air without human intervention. For ventilation of isolated activities in mines with natural ventilation. On the surface, the huayrachina ends in a chimney or short ventilation raise in order to achieve the required pressure differential.įor ventilation of drifting or tunnelling operations. This method is suitable for ventilating mines with only one opening to the surface. Huayrachina is a bricked duct erected on one side of the roadway floor. Limited to construction of the duct (huayrachina)īibliography, Source: Priester, Schauroth, Ponson, Winkelmann In earlier times, widely distributed in Latin America Use in constructing the duct (huayrachina), requiring that the mine's Larger host-rock fragments should be generated during blasting for 30 cm in width x 70 cm in heightĭifferential air pressure and temperature Canal de ventilacion embovedado, huayrachina, huayracanyonĪir channel approx.
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