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Canada gets more than just pandas in black and white as Harper signs China uranium deal

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A Mining Rule of Thumb (courtesy of Stantec / Mining)
Mining Field: Ventilation and Air Conditioning Area: Heat Load (Rule#364)
In a hot mine, the heat generated by the wall rocks of permanent airways decays exponentially with time – after several months it is nearly zero. There remains some heat generated in permanent horizontal airways due to friction between the air and the walls. read more »
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