Kirkland Lake Gold Ltd. engages in the acquisition, exploration, development, and operation of gold properties. It owns and operates four underground gold mines, including the Macassa, Holt, and Taylor mines located in northeastern Ontario, Canada; and the Fosterville Mine located in Victoria, Australia, as well as three milling facilities in Canada and Australia. The company was formerly known as Newmarket Gold Inc. and changed its name to Kirkland Lake Gold Ltd. in December 2016. Kirkland Lake Gold Ltd. was incorporated in 1983 and is headquartered in Toronto, Canada.