Ventilating a three kilometre depth mine is no easy task. Itís necessary because the air temperature underground can be over 20 degrees warmer than on the surface.
That can be an advantage during the winter, but itís not so great during the summer.
"In deep mines it can be very different, you can experience temperatures that are 30 to 40 degrees centigrade, so itís hot, it can be humid, it can be very noisy, it can be dusty so it is a difficult working environment," Stephen Hardcastle, NRCAN-CANMET Research Scientist.
Natural Resources Canada is leading research on VOD, or ventilation-on-demand. The idea is to focus more air where itís needed underground.
"Itís long been realized that ventilation is a major cost and energy user within the mining industry. So we are looking at how that air flow can be managed more effectively, how we can condition it and also looking at how much is required to dilute the contaminants."
Hardcastle also adds that if our climate gets warmer, the number of hot days underground will increase and more mines will have to consider cooling their air. The size of refrigeration system they choose could be mitigated with VOD.