KIRKLAND LAKE, Ontario Closed since 1997 the Macassa gold mine may yet get another shot at production. KIRKLAND LAKE GOLD reports three new mineralized zones have been discovered south of the 4700 level. Between its opening in 1925 and its closure six years ago, the Macassa mine produced 22 million oz of gold. The No.3 shaft, 7,225 ft deep, was the deepest single-lift shaft in the Western Hemisphere until the mid-1990s.
The new zones are located about 800, 1,365 and 1,617 ft from the main mine workings. The closest one assayed 2.94 oz/ton Au (uncut) over 5.5 ft. The next returned 0.77 oz/ton over 2.7 ft, and the farthest assayed 0.16 oz/ton over 62.2 ft including 1.89 oz/ton over 3.0 ft. The company says that at least four hanging wall vein systems have now been identified between 600 and 1,600 ft south of the old mine.
Kirkland Lake Gold believes that the gold mineralization of the Main Break of Kirkland Lake is centred over a large porphyry body at depth. This intrusive is located below the former Lake Shore gold mine, where the host rock is porphyry for the bottom half of the mine. The wide, hydrothermally-altered porphyry body recently drilled could represent a similar ‘plumbing’ system for a southern mineralized part of the camp parallel to the Main Break, adds the company.
A history of the Macassa mine is posted at www.klgold.com.