The Nighthawk Peninsular Gold Mine is situated on Nighthawk Lake, ten miles east of Porcupine, Ontario. The ore bodies lie in or near a stock of albite syenite intruding Keewatin lavas. The deposits consist of carbonate zones with disseminated sulphides, cut by auriferous quartz stringers. Bright-green fuchsite is a characteristic mineral. The geological and mineralogical features are discussed and reference is made to the physical and chemical conditions controlling the position of the ore bodies. Comparisons are made with similar deposits occurring in other parts of Ontario and Quebec, in California, and in Western Australia.

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