Winnie Shaft Area - High-Grade Copper

All four holes targeting the Winnie Shaft zone intersected semi-massive to massive sulphides, confirming continuity and grade from surface.

Table 1 - Drill results for the Winnie Lake drilling containing massive sulphides.

This dual system parallels major Blake River Group deposits such as LaRonde, Horne, and Upper Beaver, underscoring district-scale potential.

Drill Program Comments

The inaugural program consisted of 10 drill holes totaling 1,722 m (see Table 3), with 1,011 samples, including QA/QC blanks and standards, submitted to MSA Labs in Timmins, Ontario.

KLD25-29
Designed to test the mafic volcanic-syenite contact between the Winnie Shaft area and Mini Winnie (see July 24, 2025 news release ), in an area with no surface exposure. The hole intersected syenite much shallower than anticipated, indicating the contact is structurally complex and leaving the 1 km corridor between the two showings largely untested, a high-priority follow-up target.

KLD25-30
Drilled in the opposite direction of KLD25-29, this hole intersected anomalous Cu-Zn-Au-Ag mineralization, confirming metal fertility along the corridor. Additional sampling has been completed, with assays pending.

KLD25-31
Collared over a magnetic low coincident with an east-west structure, this hole successfully intersected both the structural zone and gold-bearing syenite, marking the first documented occurrence of gold mineralization within the Winnie syenite stock. This intersection represents a major step in defining a new intrusion-related gold system.

KLD25-32
Located ~2 km northeast of the Winnie Shaft along the outer periphery of the Winnie Pluton, this hole targeted the contact between a magnetic high and low, supported by coincident Au-Bi-Te soil anomalies. It intersected an unmapped syenite feldspar porphyry hosting gold-only and gold-critical element mineralization, confirming a second, distinct mineralized system. This discovery reinforces the interpretation that the Winnie Pluton is the mineralizing engine driving an extensive polymetallic system within and along the 17-km perimeter.

KLD25-33
Drilled northeast of KLD25-32; no significant assays were returned. The hole provides valuable geological context for refining structural and lithological models.

KLD25-37
A steep hole targeting the Winnie Shaft sulphide zone at depth, beneath historical drilling. The hole ended in mineralization, returning 4.45 m of 0.105% Cu, 0.083% Zn, 0.022 g/t Au, and 0.745 g/t Ag from 97.55-102.0m. The zone remains open at depth and will be a focus of deeper follow-up drilling.

Collectively, these results demonstrate the exceptional fertility of the Winnie Pluton and its surrounding contact zones. The shallow intersections of syenite and widespread presence of copper, gold, and critical elements confirm a robust, multi-phase mineralizing system that remains open in all directions.

Table 3 - Drill hole locations, direction, inclination, and meterage for summer 2025 drill program.

District-Scale Context and Exploration Advancement

The Kirkland Lake district has produced over 40 million ounces of gold, with major deposits typically associated with intrusive-related systems and regional structural controls. KLDC's 40,000-hectare land position represents the largest consolidated package in the district's history, encompassing the complete 17-km Winnie Pluton contact zone.

The Company will expand its dataset with advanced geophysics and geochemistry to define the most prospective targets across this contact zone. A Heli-MT survey was just completed (see news release October 9, 2025 ) which will provide high-resolution imaging of intrusive contacts from the surface to depths of up to one kilometre. The system integrates the latest advances in electronics, airborne system design, and sophisticated signal processing techniques to deliver high-quality subsurface imaging. The results will feed directly into the design of the KLDC's next phase of drilling, planned to aggressively test the most promising targets at depth and along strike as the system continues to open up.

QA/QC Protoco l

Drill core samples were cut by diamond saw at KLDC's core logging facility. Certified reference materials and blanks were inserted into the sample sequence at a frequency of four each per 100 samples (8% insertion rate). A halved core sample was left in the core box with the other half core sent for sample analysis. Analytical services were provided by MSA Labs with secured samples personally delivered by KLDC personnel. Samples were prepared at MSA Labs laboratory in Timmins, Ontario. Gold was analyzed through Fire Assay (50 gm subsample) with atomic absorption (AA) finish (code FAS-121). All samples were also analyzed in MSA's Langley, BC laboratory for 34 elements by an ICP-ES method with the addition of Te (code ICP-230). MSA routinely inserts certified reference materials, blanks and pulp duplicates, and results of all QC samples are reported.

Geological Significance

The intersection of intrusion-related polymetallic mineralization at KL West is a significant breakthrough for the Kirkland Lake camp and the Company's landholdings. The 17-km perimeter of the Winnie Pluton, combined with the deposit model, presents strong potential for additional discoveries of this nature. Encountering a system with this combination of intrusive rocks, alteration, and mineralization in the Company's first drill program testing the Winnie Pluton, is a major technical success and positions KLDC well, with the district land package it holds.

Within the Blake River Group of rocks, intrusion-related deposits display similar mineralization and alteration as to what has been observed in the initial drill program at KL West. Some of the most significant production centers and recent discoveries in the Abitibi are found within the Blake River Group including La Ronde, Horne and Upper Beaver.

QP Statement

The technical information contained in this news release has been approved by Mike Kilbourne, P.Geo., Senior geologist and independent contractor, who is a Qualified Person as defined in National Instrument 43-101, Standards of Disclosure for Mineral Projects.

About Kirkland Lake Discoveries Corp.

Kirkland Lake Discoveries Corp. (TSXV: KLDC) has assembled a 400-km² exploration portfolio in the Kirkland Lake region of Ontario's Abitibi Greenstone Belt, one of the most prolific mining districts in the world. The Company's properties span key fault zones, geophysical anomalies, and volcanic-sedimentary contacts within the Blake River Group, a highly prospective assemblage known to host both gold and polymetallic massive-sulphide deposits.

With exploration permits now in place, KLDC is positioned to advance a strong pipeline of drill-ready targets at KL East and KL West, supported by multiple anomalous soil trends, historical mineral showings, and structurally controlled intersections. The team combines strong technical experience with a focus on smart, efficient exploration designed to deliver results.

For additional information, please contact:

Stefan Sklepowicz
Chief Executive Officer

+1 226 979 3515
...

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Forward-Looking Statements

This news release contains "forward-looking statements" within the meaning of applicable securities legislation. All statements, other than statements of historical fact, are forward-looking statements. Forward-looking statements in this news release relate to, among other things, the Company's future drill programs, the results thereof, and the potential for new discoveries. There can be no assurance that such statements will prove to be accurate, and actual results and future events could differ materially from those anticipated in such statements. The Company does not assume any obligation to update forward-looking statements of beliefs, opinions, projections, or other factors, should they change, except as required by applicable securities laws. Mineralization hosted on adjacent and/or nearby properties is not necessarily indicative of mineralization hosted on the Company's property.

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SOURCE: Kirkland Lake Discoveries Corp.

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