The Red Lake Mine is the richest gold mine in North America with over 5 million ounces of reserves and a 2004 production of over 550,000 ounces of gold at a cash cost of 92 us dollars per ounce. Starting in 2003, Goldcorp initiated an expansion program at the mine. This expansion included a new 6.55 m (21.5 ft) diameter hoisting shaft currently under construction. The shaft will be driven to a length of approximately 2,000 m (6,500 ft). The shaft will be used as the primary intake to the mine. The original ventilation design was to have a "push/pull" ventilation system. In 2005, a detailed review of the mine expansion program was performed. This review resulted in a proposal for significant modifications to the mine ventilation system. This paper describes the proposed changes in the ventilation system designed to optimize this system.
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