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There are three main reasons for ventilating a mine: A. to circulate air; B. to take out unwanted gases, dust and fumes; C. to regulate the temperature. In the early days of mining ventilation was not a problem. It only became so when pits were dug deeper and deeper. The one of the earliest forms of ventilation was a furnace at the bottom of the shaft. After 1862 a law was passed which said that every mine must have at least 2 shafts (upcast and downcast shafts) for ventilation and safety purposes. 

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Fan engine ventilation circuit Methane gas use
Fan engine
Ventilation circuit
Methane gas use