Kirkland Lake Gold Ltd. is a Canadian gold producer focused on the acquisition, development, exploration, and operation of gold mining properties in Canada and Australia. The company operates cornerstone assets including the Macassa Mine complex and Detour Lake Mine in Northern Ontario, Canada; the Fosterville Mine in Victoria, Australia; and supporting facilities such as the Holt Complex with Taylor, Holt, and Holloway mines, along with the Holt mill; it targets high-grade underground and open-pit gold production with by-product silver. Founded prior to its 2016 name change from Newmarket Gold Inc. and headquartered in Toronto, Ontario, Kirkland Lake Gold serves institutional investors and gold markets primarily in North America and Australia.
In February 2022, Kirkland Lake Gold completes a merger of equals with Agnico Eagle Mines Limited in a US$11 billion all-stock transaction, under which Agnico Eagle acquires 100% of Kirkland Lake Gold shares at a ratio of 0.7935 Agnico Eagle shares per Kirkland Lake Gold share, forming a combined entity with enhanced production from the Abitibi Greenstone Belt and global assets; post-merger, Kirkland Lake Gold operates as part of Agnico Eagle, with its mines integrated into the survivor's portfolio, including ongoing expansions at Macassa such as new ramp access to Near Surface and Amalgamated Kirkland deposits. Prior to the merger, the company pursues strategic partnerships, including 2021 equity investments and joint venture options with Orefinders Resources and Mistango River Resources for projects in the Kirkland Lake district, and a 2020 expansion at Macassa with the Northgate shaft commissioning to boost capacity from 6,000 to 8,000 tonnes per day. The merger establishes Kirkland Lake Gold's assets within Agnico Eagle's low-cost, high-margin operations as of 2025.