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Seabridge Gold Files Updated NI-43-101 Courageous Lake Technical Report A Canadian Gold Project with 11 Million Ozs of M&I Resource Has Been Redesigned for Much Improved Economics

Resource Estimates Technical Reports (NI 43-101)

106 Front Street East, Suite 400, Toronto, ON M5A 1E1, Canada

416-367-9292 www.seabridgegold.com

News Release

Trading Symbols: TSX: SEA FOR IMMEDIATE RELEASE

NYSE: SA February 29, 2024

Seabridge Gold Files Updated NI-43-101

Courageous Lake Technical Report

A Canadian Gold Project with 11 Million Ozs of M&I Resource

Has Been Redesigned for Much Improved Economics

Toronto, Canada … Seabridge Gold announced today that it has filed a new NI-43-101 Technical

Report for its 100%-owned Courageous Lake project located in Canada’s Northwest Territories

(SEDAR filing ). The new Technical Report includes the results of an updated Preliminary

Feasibility Study (the “2024 PFS”) and a new Preliminary Economic Assessment (the “2024

PEA”) that evaluates a conceptual expansion of the Courageous Lake open pit beyond the 2024

PFS mine plan. Results of the 2024 PFS and 2024 PEA were announced on January 16, 2024

and can be found here.

The new Technical Report was led by Ausenco Engineering Canada ULC. (“Ausenco”), together

with the support of Moose Mountain Technical Services (“MMTS”), SRK Consulting (Canada) Inc.

(“SRK”), ERM Consultants Canada Ltd. (“ERM”), Tetra Tech Canada Inc. (“Tetra Tech”), and WN

Brazier Associates Inc. (“Brazier”), all of which are independent of Seabridge Gold.

2024 Courageous Lake PFS

The 2024 PFS shows a considerably more sustainable and profitable mining operation than its

2012 predecessor, with reduced initial capital, lower strip ratio, higher grade and smaller mine

footprint.

Commenting on the study, Seabridge Chairman and CEO Rudi Fronk said: “ Our work shows

Courageous Lake as a profitable project in the current environment, in a safe jurisdiction, with

considerable exploration upside. The project consists of an entire greenstone belt which has

prospective shallow drill results and gold showings along its 54 km length. As we move towards

a joint venture on our KSM project, we will be directing more attention to Courageous Lake’s

potential to generate considerable additional shareholder value.”

Notable improvements in the 2024 PFS compared to the 2012 PFS include:

• 73% increase in after-tax NPV5% to US$523 million from US$303 million in 2012

• 50% reduction in initial capital from US$1,522 million to US$747 million

• Increased after-tax IRR from 7.3% to 20.6%

• Reduced capital payback period from 11.2 years to 2.8 years

• Average gold reserve grade increased 19% from 2.2 g/t to 2.6 g/t

• Life of mine strip ratio reduced by 39% from 12.5 to 7.58

• 38% increase in estimated measured and indicated gold resources from 8.0 million to 11.0

million ounces (145.2 million tonnes at an average grade of 2.36 grams of gold per tonne)

2024 Courageous Lake PEA

The 2024 PEA is a standalone mine plan that evaluate s a conceptual expansion of the

Courageous Lake open pit below the base of the permafrost after the 2024 PFS reserve has

been completely mined out. None of the Mineral Resources used in the 2024 PEA mine plan

have been used in the 2024 PFS.

Mr. Fronk noted that the 2024 PEA establishes the potential for a much longer mine life beyond

the 2024 PFS . “The PFS uses less than 30% of the estimated M&I gold resource. The PEA

includes inferred resource s requiring more drilling as well as additional engineering work to

qualify as a PFS. However, we are confident that the PEA reflects the potential for a greatly

extended mine life and that the entire estimated M&I resource represents a meaningful call on

gold for our shareholders.”

The PEA is preliminary in nature and includes Inferred Mineral Resources that are considered

too speculative geologically to have the economic considerations applied to them that would

enable them to be categorized as Mineral Reserves, and there is no certainty that the results of

the PEA will be realized. Mineral Resources in the PEA mine plan are not Mineral Reserves and

do not have demonstrated economic viability.

Qualified Persons

Tracey Meintjes, P.Eng., a Qualified Person for the purposes of NI 43 -101, has reviewed and

approved the scientific and technical disclosure contained in this news release on behalf of

Seabridge Gold.

About Seabridge Gold

Seabridge holds a 100% interest in several North American gold projects. Seabridge's principal

asset, the KSM project, and its Iskut projects are located in Northwest British Columbia,

Canada’s “Golden Triangle”, the Courageous Lake project is in Canada's Northwest Territories,

the Snowstorm project in the Getchell Gold Belt of Northern Nevada and the 3 Aces project is

in the Yukon Territory. For a full breakdown of Seabridge's Mineral Reserves and Mineral

Resources by category please visit the Seabridge's website at http://www.seabridgegold.com.

About Ausenco

Ausenco is a global company redefining what’s possible. Its team is based across 26 offices in

15 countries, with projects in over 80 locations worldwide. Combining their deep technical

expertise with a 30 -year track record, Ausenco provides innovative, value -add consulting

studies, project delivery, asset operations and maintenance solutions to the mining & metals

and industrial sectors.

Cautionary note to U.S. Investors concerning estimates of Mineral Reserves and Mineral Resources

All reserve and resource estimates reported by Seabridge were estimated in accordance with the Canadian National

Instrument 43-101 and the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Definition Standards. The U.S.

Securities and Exchange Commission (“SEC”) now recognizes estimates of “measured mineral resources,” “indicated

mineral resources” and “inferred mineral resources” and uses new definitions of “proven mineral reserves” and “probable

mineral reserves” that are substantially similar to the corresponding CIM Definition Standards. However, the CIM Definition

Standards differ from the requirements applicable to US domestic issuers. US investors are cautioned not to assume that

any “measured mineral resources,” “indicated mineral resources,” or “inferred mineral resources” that the Issuer reports are

or will be economically or legally mineable. Further, “inferred mineral resources” are that part of a mineral resource for

which quantity and grade are estimated on the basis of limited geologic evidence and sampling. Mineral resources which

are not mineral reserves do not have demonstrated economic viability.

Cautionary Note Regarding Forward-Looking Information

This document contains "forward-looking information" within the meaning of Canadian securities legislation and “forward-

looking statements” within the meaning of the United States Private Securities Litigation Reform Act of 1995. This

information and these statements, referred to herein as “forward -looking statements” are made as of the date of this

document. Forward -looking statements relate to future events or future performance and reflect current estimates,

predictions, expectations or beliefs regarding future events and include, but are not limited to, statements with respect to:

(i) the estimated amount and grade of mineral reserves and mineral resources, including the cut-off grade; (ii) estimates of

the capital costs of constructing mine facilities and bringing a mine into production, of operating the mine, of sustaining

capital, of strip ratios and the duration of financing payback periods; (iii) the estimated amount and duration of future

production, both ore processed and metal recovered and recovery rates; and (iv) estimates of operating costs, life of mine

costs, net cash flow, net present value (NPV), profitability, and economic returns from an operating mine. Any statements

that express or involve discussions with respect to predictions, expectations, beliefs, plans, projections, objectives or future

events or performance (often, but not always, using words or phras es such as “expects”, “anticipates”, “plans”, “projects”,

“estimates”, “envisages”, “assumes”, “intends”, “strategy”, “goals”, “objectives” or variations thereof or stating that certa in

actions, events or results “may”, “could”, “would”, “might” or “will” be taken, occur or be achieved, or the negative of any of

these terms and similar expressions) are not statements of historical fact and may be forward-looking statements.

All forward-looking statements are based on Seabridge's or its consultants' current beliefs as well as various assumptions

made by them and information currently available to them. The most significant assumptions are set forth above, but other

assumptions include: (i) the presence of and continuity of metals at the Project at estimated grades; (ii) the geotechnical

and metallurgical characteristics of rock conforming to sampled results; (iii) the quantities of water and the quality of the

water that must b e diverted or treated during mining operations; (iv) the capacities and durability of various machinery

and equipment; (v) the availability of personnel, machinery, equipment at estimated prices and within the estimated

delivery times; (v) currency exchange rates; (vi) metals sales prices; (vii) appropriate discount rates applied to the cash flows

in the economic analysis; (viii) tax rates and royalty rates applicable to the proposed mining operation; (ix) the availabili ty

of acceptable financing under assu med structure and costs; (ix) anticipated mining losses and dilution; (x) metallurgical

performance; (xi) reasonable contingency requirements; (xii)success in realizing proposed operations; (xiii) receipt of

permits and other regulatory approvals on acceptable terms; and (xiv) the successful conclusion of consultation with

impacted indigenous groups. Although management considers these assumptions to be reasonable based on information

currently available to it, they may prove to be incorrect. Many forward -looking statements are made assuming the

correctness of other forward -looking statements, such as statements of net present value and internal rates of return,

which are based on most of the other forward -looking statements and assumptions herein. The cost information is also

prepared using current values, but the time for incurring the costs will be in the future and it is assumed costs (and metals

prices) will remain stable over the relevant period.

By their very nature, forward -looking statements involve inherent risks and uncertainties, both general and specific, and

risks exist that estimates, forecasts, projections and other forward -looking statements will not be achieved or that

assumptions do not reflect future experience. We caution readers not to place undue reliance on these forward -looking

statements as a number of important factors could cause the actual outcomes to differ materially from the beliefs, plans,

objectives, expectations, anticip ations, estimates assumptions and intentions expressed in such forward -looking

statements. These risk factors may be generally stated as the risk that the assumptions and estimates expressed above do

not occur as forecast, but specifically include, without limitation: risks relating to variations in the mineral content within

the material identified as mineral reserves or mineral resources from that predicted; variations in rates of recovery and

extraction; the geotechnical characteristics of the rock mined or through which infrastructure is built differing from that

predicted, the quantity of water that will need to be diverted or treated during mining operations being different from

what is expected to be encountered during mining operations or post closur e, or the rate of flow of the water being

different; developments in world metals markets; risks relating to fluctuations in the Canadian dollar relative to the US

dollar; increases in the estimated capital and operating costs or unanticipated costs; diffi culties attracting the necessary

work force; and risks relating to the costs of other energy sources; increases in financing costs or adverse changes to the

terms of available financing, if any; tax rates or royalties being greater than assumed; changes in development or mining

plans due to changes in logistical, technical or other factors; changes in project parameters as plans continue to be refined;

risks relating to receipt of regulatory approvals or the conclusion of successful consultation with impact ed indigenous

groups; changes in regulations applying to the development, operation, and closure of mining operations from what

currently exists; the effects of competition in the markets in which Seabridge operates; operational and infrastructure risks

and the additional risks described in Seabridge's Annual Information Form filed with SEDAR in Canada (available at

www.sedar.com ) for the year ended December 31, 202 3 and in Seabridge’s Annual Report Form 40 -F filed with the U.S.

Securities and Exchange Com mission on EDGAR(available at www.sec.gov/edgar.shtml). Seabridge cautions that the

foregoing list of factors that may affect future results is not exhaustive.

When relying on our forward-looking statements to make decisions with respect to Seabridge, investors and others should

carefully consider the foregoing factors and other uncertainties and potential events. Seabridge does not undertake to

update any forward-looking statement, whether written or oral, that may be made from time to time by Seabridge or on

our behalf, except as required by law.

Neither the Toronto Stock Exchange, New York Stock Exchange, nor their Regulation Services Providers

accepts responsibility for the adequacy or accuracy of this release.

ON BEHALF OF THE BOARD

"Rudi Fronk"

Chairman & C.E.O.

For further information please contact:

Rudi P. Fronk, Chairman and C.E.O.

Tel: (416) 367-9292 • Fax: (416) 367-2711

Email: [email protected]