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Greyhawk Mine is a decommissioned underground uranium mine located in Faraday Township near Bancroft, Ontario. It operated from 1954 to 1959 and from 1976 to 1982. The mine produced 80,247 tons of uranium ore, of which 0.069% was U3O8 worth $834,899.
Aside from uranium, the mine has produced some of the world's best samples of Kainosite-(Y).
By late 1956, there were 430 feet of underground cross-cuts, 1,606 feet of drifting, and 512 feet of raising, all at the first level. Underground drilling totalled 10,542 feet over 76 holes. In 1958, the shaft was lowered further, to a new depth of 402 feet, from where lower levels were established.
The ore was processed at the nearby Faraday mill on the Faraday Mine site.
Mining operations stopped in 1959.
Faraday Uranium Mines Limited purchased the site from Goldhawk Uranium Mines Limited in 1962. Madawaska Mines Limited was formed in 1975 and purchased the site, as well as the nearby Faraday Mine, restarting mining operations in 1976 until 1982.
In addition to uranium, the mine produced some of the world's best samples of Kainosite-(Y).
200,000 tons of ore, averaging 0.065% U3O8, remain in the ground.
As processing was done offsite, there are no tailings on site, therefore unlike the other nearby former uranium mines (Madawaska Mine, Bicroft Mine, and Dyno Mine), the Canadian Nuclear Safety Commission does not regulate the site.
The mine was owned by Ovintiv subsidiary EWL Management Limited, which merged into Ovintiv in February 2022.
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