Keeley-Frontier Mine is a large abandoned mine in the ghost town of Silver Centre, Northeastern Ontario, Canada. It consists of two underground mines that were sunk 1,455 ft (443 m) below the surface. Keeley Mine was discovered in 1907 while Frontier Mine was constructed in 1921. The 8th level of the Keeley Mine connected with the 6th level of the Frontier Mine in 1962, creating the two compartment Keeley-Frontier Mine. In 1965, Keeley-Frontier Mine closed with a total production of 19,000,000 oz (540,000,000 g) of silver, 3,300,000 lb (1,500,000 kg) of cobalt, 27,000 lb (12,000 kg) of nickel and 10,000 lb (4,500 kg) of copper.