UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 40-F ¨ Registration statement pursuant to Section 12 of the Securities Exchange Act of 1934 or ý Annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 For the fiscal year ended December 31, 2019 Commission File Number 001-38179 Kirkland Lake Gold Ltd. (Exact name of Registrant as specified in its charter) Ontario 1000 N/A (Province or other jurisdiction of incorporation or (Primary Standard Industrial Classification Code Number) (I.R.S. Employer organization) Identification Number) 200 Bay Street, Suite 3120 Toronto, Ontario M5J 2J1 Canada (416) 840-7884 (Address and telephone number of Registrant’s principal executive offices) Registered Agent Solutions, Inc. 99 Washington Avenue Suite 1008 Albany, NY 12260 (888) 705-7274 (Name, address (including zip code) and telephone number (including area code) of agent for service in the United States) Securities registered or to be registered pursuant to Section 12(b) of the Act: Title of each class Name of each exchange on which registered Common Shares, no par value New York Stock Exchange Securities registered pursuant to Section 12(g) of the Act: None. Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None For annual reports, indicate by check mark the information filed with this Form: ý Annual information form ý Audited annual financial statements Indicate the number of outstanding shares of each of the registrant’s classes of capital or common stock as of the close of the period covered by the annual report: 209,624,480 Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such shorter period that the registrant was required to file such reports); and (2) has been subject to such filing requirements for the past 90 days. ý Yes ¨ No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). ý Yes ¨ No Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 12b-2 of the Exchange Act. Emerging growth company ¨ If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards† provided pursuant to Section 13(a) of the Exchange Act. ¨ † The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to its Accounting Standards Codification after April 5, 2012. EXPLANATORY NOTE Kirkland Lake Gold Ltd. (the “Company” or the “Registrant”) is a Canadian issuer that is permitted, under the multijurisdictional disclosure system adopted in the United States, to prepare this annual report on Form 40-F (this “Annual Report”) pursuant to Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), in accordance with Canadian disclosure requirements, which are different from those of the United States. The Company is a “foreign private issuer” as defined in Rule 3b-4 under the Exchange Act and Rule 405 under the Securities Act of 1933, as amended. Equity securities of the Company are accordingly exempt from Sections 14(a), 14(b), 14(c), 14(f) and 16 of the Exchange Act pursuant to Rule 3a12-3 thereunder. FORWARD LOOKING STATEMENTS The Exhibits incorporated by reference into this Annual Report contain forward-looking statements that reflect our management’s expectations with respect to future events, our financial performance and business prospects. All statements other than statements of historical fact are forward-looking statements. The use of the words such as “plan”, “expect”, “budget”, “target”, “schedule”, “estimate”, “forecast”, “project”, “intend”, “believe”, “anticipate” and other similar words or statements that certain events or conditions “may”, “could”, “would”, “might”, or “will” occur or be achieved, and similar expressions may identify forward- looking statements, but the absence of these words does not mean that a statement is not forward-looking. These statements involve known and unknown risks, uncertainties, and other factors that may cause actual results or events to differ materially from those anticipated or implied in such forward-looking statements, including, without limitation, those described in the Company’s Annual Information Form (the “AIF”) for the year ended December 31, 2019 filed as Exhibit 99.1 to this Annual Report. No assurance can be given that these expectations will prove to be correct and such forward-looking statements in the Exhibits incorporated by reference into this Annual Report should not be unduly relied upon. The Registrant’s forward-looking statements contained in the Exhibits incorporated by reference into this Annual Report are made as of the respective dates set forth in such Exhibits. Such forward-looking statements are based on the opinions, assumptions and estimates of management considered reasonable at the date the statements are made, and are inherently subject to a variety of risks and uncertainties and other known and unknown factors that could cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking information. Such factors include: the price of gold; potential impacts of infectious diseases, including but not limited to COVID-19; exploration, development and operating risks; health, safety and environmental risks and hazards; risks relating to foreign operations and political risks; uncertainty in the estimation of mineral reserves and mineral resources; replacement of depleted mineral reserves; uncertainty relating to mineral resources; risks related to production estimates and cost estimates; obligations as a public company; risks relating to government regulation; risks related to acquisitions, integration and dispositions; the impact of Australian laws regarding foreign investment; access to additional capital; volatility in the market price of the Company’s securities; the continuation of the Company’s dividend policy; risks related to the Company’s investments; liquidity risk; risks related to community relations; risks relating to equity investments; risks relating to first nations and aboriginal heritage; risks relating to non-governmental organizations; the availability of infrastructure, energy and other commodities; nature and climactic conditions; risks related to information technology and cybersecurity; timing and costs associated with the design, procurement and construction of the Company’s various capital projects, including but not limited to the #4 Shaft project at the Company’s Macassa mine complex located in northeastern Ontario and the ventilation and paste fill plant project at the Company’s Fosterville gold mine located in the State of Victoria, Australia; permitting; risks related to insurance and uninsured risks; the prevalence of competition within the mining industry; currency exchange rates (such as the Canadian dollar and the Australian dollar versus the United States dollar); availability of sufficient power and water for operations; risks associated with tax matters and foreign mining tax regimes; risks relating to activist shareholders; risks relating to potential litigation; risks associated with the mineral tenure regimes in jurisdictions where the Company operates; risks associated with title to the Company’s mining claims and leases; risks relating to the dependence of the Company on outside parties and key management personnel; risks relating to the Company’s counterparties; risks associated with dilution; labour and employment matters; risks in the event of a potential conflict of interest; risks relating to the Company’s disclosure and internal controls; risks relating to global financial conditions; as well as those risk factors discussed or referred to in the Company’s annual management’s discussion and analysis (the “MD&A”) as at and for the years ended December 31, 2019 and 2018 filed as Exhibit 99.3 to this Annual Report. In preparing this Annual Report, the Company has not updated such forward-looking statements to reflect any change in circumstances or in management’s beliefs, expectations or opinions that may have occurred prior to the date hereof. Nor does the Company assume any obligation to update such forward-looking statements in the future. For the reasons set forth above, investors should not place undue reliance on forward-looking statements. This list is not exhaustive of the factors that may affect our forward-looking statements. Some of the important risks and uncertainties that could affect forward- looking statements are described further in the exhibits attached to this Annual Report, including those described in the AIF and the MD&A and incorporated by reference herein. Should one or more of these risks and uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described in the forward-looking statements. 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