Introduction
The Enterprise mine is located at Mount Isa and is wholly owned by Mount Isa Mines Limited (MIM). It is being developed, at a cost of $331 million, from about 1000 m below surface to almost 2000 m below surface. Expected completion is late calender 1999. The effects of high surface ambient temperatures in summer, combined with “autocompression”1 in the intake airways and high virgin rock temperatures2 results in heat stress in the working place that, without intervention, would exceed the levels that human physiology can withstand. It would also result in significant decreases in productivity and high accident rates even where work is possible
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