KLDC.V · 2025-08-26 12:00:00

Kirkland Lake Discoveries Expands Mineralized System with Semi-Massive to Massive Sulphide Intersections in Three Additional Holes at KL West Property

Drill Results

Kirkland Lake Discoveries Expands

Mineralized System with Semi-Massive to

Massive Sulphide Intersections in Three

Additional Holes at KL West Property

Toronto, Ontario--(Newsfile Corp. - August 26, 2025) -

Kirkland Lake Discoveries (TSXV: KLDC)

(OTCID: KLKLF) ("KLDC" or the "Company")

is pleased to report that recent drilling at the KL West

Property has expanded the mineralized system, with three additional holes intersecting semi-massive to

massive sulphides. The results confirm the role of the Winnie Pluton as a key driver of mineralization and

represent a significant advance in the Company's intrusive-related exploration model across a district-

scale land position.

Three additional holes near KLD25-28 (see

August 12

news release) cut broad zones of alteration

with disseminated sulphides haloing semi-massive to massive sulphide mineralization.

KLD25-37 intersected mineralization at 97.5 m downhole, demonstrating the system's continuity at

depth.

All 1,011 samples from the program have been submitted for assay and are pending.

Drilling validates the Winnie Pluton's role as a key driver of mineralization, further supporting

KLDC's intrusive-related model.

Management Commentary:

The consistency of alteration patterns and sulphide mineralization styles across multiple holes has

validated our intrusive-related model and demonstrated the robust nature of this system. What we're

observing represents a significant departure from the limited historical interpretation. The geological

evidence indicates the Winnie Shaft historically captured only the uppermost expression of a much

larger intrusive-driven system. The systematic alteration halos, multiple mineralization styles, and

depth continuity we've intersected are characteristic of the major intrusive-related deposits that have

defined production in the Abitibi. With our 40,000-hectare land position encompassing the entire 17-

kilometer Winnie Pluton contact, we have established a substantial exploration target with the

geological characteristics consistent with district-scale mineralizing systems

." — Stefan Sklepowicz,

CEO.

A New Interpretation: Targeting an Intrusive System

The program was designed to test a new geological model around the historical Winnie Shaft, an area

previously known for copper, zinc, silver, and gold. The shaft itself only reached ~20 feet and was

originally explored as a volcanogenic massive sulphide (VMS).

KLDC's technical team now believes the mineralization is more likely part of an

intrusive-related

system

, with heat and fluids from the Winnie Pluton driving mineral deposition (see Figure 1). Unlike

layered seafloor-style VMS deposits, intrusive systems typically form extensive, cohesive zones of

mineralization that extend to significant depths and across wide contact zones. This program represents

the first test of this model.

Figure 1

- Regional magnetic survey map (1VD) outlining the approximate 17-km perimeter of the

Winnie Intrusion. Magnetic highs (red/purple) correspond to areas of interest along the intrusion contact,

where gold, copper (intrusion-related) and polymetallic VMS occurrences are documented. Anomalous

soil results further highlight high-priority targets along the intrusion margin.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_14be770894965a14_001full.jpg

Drill Program Observations

The program consisted of 10 drill holes totalling 1,722 m (see Table 1), with 1,011 samples

(including QA/QC blanks and standards) submitted to MSA Labs in Timmins.

Multiple holes intersected semi-massive to massive sulphides near the Winnie Shaft, associated

with alteration halos and intrusive contacts, supporting the new model.

Multiple mineralization styles were core-logged, indicating a robust mineralizing system with

several pulses of fluid activity.

Combined with prior surficial sampling (which returned elevated bismuth — see

July 9

and

July 24

news releases), evidence points to a large intrusive-related system.

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 planned for the fall will provide high-

resolution imaging of intrusive contacts at depths of up to one kilometre. The 1,011 samples currently at

the laboratory will provide both mineralization grade information and geochemical signatures to help

vector towards the heart of the system (or towards the system's highest-grade zones).

These 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.

Important Note on Visual Data:

The Company cautions that visual identification and estimates of sulphide mineralization are not a

substitute for quantitative laboratory assays. While the presence of certain minerals is encouraging, only

analytical lab results can determine the grade of copper, zinc, silver, and gold.

Summary of Visual Drill Core Logging — Winnie Lake Project (Assays Pending)

KLD25-28

The hole intersected multiple zones of strong mineralization. From 15-23 m, a silicified basalt with

disseminated sulphides was logged. A 2.4-m interval of semi-massive to massive sulphides followed,

with pyrite, chalcopyrite, and sphalerite. Additional massive sulphides were encountered at 39-40 m,

again associated with silicified basalts. The hole also intersected brecciated basalt and syenite contacts

deeper downhole, confirming a complex, mineralized environment.

Figure 2

KLD25-28 from 25 m — semi-massive to massive pyrite, chalcopyrite and silicified basalt.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%202.jpg

Figure 3

KLD25-28 from 40 m — massive pyrite, chalcopyrite and sphalerite.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%203.jpg

Figure 4

KLD25-28 from 44 m — strongly silicified and mineralized basalt with very fine disseminated

pyrite/chalcopyrite.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%204.jpg

KLD25-29

Drilling targeted the contact between Winnie Shaft and Mini Winnie. The hole was dominated by mafic

syenite, strongly magnetic and massive, interlayered with minor mafic volcanics. No significant sulphide

zones were logged, but the contact relationship is geologically important for outlining the geometry.

KLD25-30

This hole was drilled northeast of KLD25-29, cutting through mafic volcanics and syenite intrusives. The

volcanics were strongly magnetic in places, and intervals of porphyritic syenite contained quartz veining.

No massive sulphide intervals were observed, but the geology confirms the intrusive-volcanic

relationship across the target area.

KLD25-31

Targeting a magnetic low within syenite, this hole intersected long runs of massive hornblende syenite

with strong magnetism (3-101 m and 103-265 m). While no massive sulphides were encountered, the

presence of brecciation and some veining with disseminated sulphides is encouraging.

Figure 5

KLD25-31 from 19 m — massive hornblende syenite with brecciated smoky quartz veins.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%205.jpg

KLD25-32

This hole was dominated by syenite - feldspar porphyry. Alteration included potassic-hematite zones and

occasional intervals of weak mineralization. Although sulphide content was limited, the style of alteration

is consistent with fertile intrusive systems.

KLD25-33

Drilling at a gabbro/intrusive contact at surface, this hole intersected syenite - feldspar porphyry with

weak to moderate alteration. No significant sulphides were observed, but the contact geology provides

structural and lithological context for future drilling.

KLD25-34

After shallow overburden (13.5 m), drilling cut a zone of massive sulphides between 18-20 m, dominated

by pyrite and chalcopyrite. Another semi-massive to massive sulphide interval was intersected at 35-36

m. Surrounding mafic volcanics were often silicified, with evidence of syenite dykes and brecciation. This

hole demonstrates the presence of shallow, high-sulphide zones within the shaft area.

Figure 6

KLD25-34 from 18.5 m — semi-massive to massive sphalerite rimmed with

pyrite/chalcopyrite quartz carbonate veinlets and massive clots of magnetite.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%206.jpg

Figure 7

KLD25-34 from 23.25m — interval of silicified mafic volcanics with pyrite, chalcopyrite and

quartz carbonate veins within an intrusive syenite dyke.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%207.jpg

KLD25-35

Multiple intervals of semi-massive to massive sulphides were logged, including 14.6-17 m and 18.3-19.6

m. Mineralization consisted of pyrite, chalcopyrite, and associated magnetite. Syenite intervals showed

brecciation, silicification, and potassic-hematite alteration, reinforcing the presence of a mineralized

intrusive-volcanic system.

Figure 8

KLD25-35 from 40.10 m — a raft of mafic volcanics with pervasive chalcopyrite within a

highly altered syenite with chalcopyrite.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%208.jpg

KLD25-36

This hole returned several short zones of semi-massive to massive sulphides, including 21.75-22 m,

24.2-24.7 m and 25.2-26.0 m, dominated by pyrite. Surrounding mafic volcanics were strongly silicified

and chloritic, with a syenite dyke observed at 26 m. The repeated association of sulphides with intrusive

contacts is highly encouraging.

Figure 9

KLD25-36 from 21.75 m — massive magnetite, pyrite and chalcopyrite.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%209.jpg

Figure 10

KLD25-36 from 25.8 m — semi-massive to massive pyrite with chalcopyrite.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/5701/263889_kirkland%20figure%2010.jpg

KLD25-37

Testing deeper away from the Winnie Shaft, the hole intersected mafic volcanics interleaved with syenite

and granodiorite. While no thick sulphide intervals were observed, alteration included potassic-hematite

zones and magnetic volcanics, confirming a complex intrusive-volcanic environment. The hole ended in

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