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The Rayrock Mine was a uranium producing venture in the Northwest Territories, Canada. It is located on the south side of Maryleer Lake and the north shore of Fault Lake, 169 kilometers northwest of Yellowknife and 74 kilometres northwest of Rae. Radioactive deposits were originally staked in 1948 a
nd then restaked in 1950. American Yellowknife Mines Limited explored the site with detailed Geiger surveys and extensive trenching in the early 1950s. In 1954 exploration work included over 10,000 feet (3,000 m) of surface diamond drilling, and the company was reorganized as Rayrock Mines Limited. Underground development began in 1955 with the driving of a long adit tunnel to intersect the radioactive zones 300 feet (91 m) below surface. The mine opened in June 1957 with a 150 tons per day leaching mill. Development was expanded and the mine reached depths of 1,000 feet (300 m) by the end of 1957. The failure to locate ore in significant quantity below the 1,000-foot (300 m) level resulted in the cessation of mining on July 31, 1959. During the operations at Rayrock Mine, an on-site mill facility processed 78,781 short tons of uranium ore yielding 458,020 pounds of uranium concentrate. Rayrock...
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