C3. Open-pit Uranium Mine. The Gaertner Pit of the Key Lake uranium mine is located in Northern Saskatchewan, Canada. It is one of the richest open-pit uranium mines on Earth, and Canada is the largest producer and exporter of uranium in the world. Surface radioactivity from this mine reaches a level 7,000 times higher than background. Gaertner Pit, Key Lake Mine, Northern Saskatchewan, Canada. 17 September 1986.
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