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Kirkland Lake Discoveries Announces Phase 1 Drilling Completion and Provides Exploration Update

Exploration Programs

TSX-V:KLDC

KIRKLAND LAKE DISCOVERIES CORP.

25 Adelaide Street East, Suite 1400, Toronto, Ontario, M5C 3A1 | kirklandlakediscoveries.com | +1 416 363 0317

Kirkland Lake Discoveries Announces Phase 1 Drilling Completion

and Provides Exploration Update

Toronto, September 7, 2023 – Kirkland Lake Discoveries Corp. (TSX -V - KLDC) (“Kirkland Lake

Discoveries” or the “Company”) is pleased to announce that the Phase 1 drill program has been completed

safely and efficiently at the Kirkland Lake Project. A total of nine drill holes (2,991m) were drilled on the

Goodfish-Kirana property completing the first of three drill phases previously announced in the July 20,

2023 Press Release.

Phase 1 drilling focused on regional targets along the east-west trending Kirana Deformation Zone defined

by coincident intersecting northwest structures, IP chargeability anomalies , and known gold mineralization

at shallow depths. Two holes were also completed on the Jo Zone to investigate recent high-grade assays

in the hanging-wall, where drilling in 2021 reported 155 g/t Au over 0.75m and 72 g/t Au over 0.50m.

Drill holes KLD23-08 and KLD23- 09 were planned as significant down- dip step-outs to test the Jo Zone

shear struct ure and previous high-grade intersections in the hanging- wall (Table 1) . Both drill holes

successfully intersected the primary shear zone. Assays are pending.

Table 1 - Phase 1 drill holes location, orientation, and total depth.

"This drill program was planned through a meticulous targeting exercise incorporating all the exploration

tools deployed over the Goodfish- Kirana claim package over the last ten years. The Kirana Deformation

Zone, a second- order structure of the Larder Lake Cadillac D eformation Zone, remains a target of high

merit. Initial observations indicate the presence of sulphide mineralization, alteration, and shearing at the

targeted intervals” stated Danièle Spethmann, President and CEO of Kirkland Lake Discoveries.

The last samples of the Phase 1 drill program will be submitted for analyses by early September with results

expected mid-October.

Regional Exploration Update

The analysis of the high-resolution airborne magnetic geophysical survey on the Lucky Strike property (see

July 13, 2023 Press Release) has been finalized by ALS GoldSpot. The result of the interpretative work has

enhanced the geological and structural understanding of the Lucky Strike property supporting target

prioritization and field work.

Drill Hole

No.

Easting Northing Elevation

(m)

Azimuth Dip Total

Depth (m)

KLD23-01 574531 5339050 269 350 -60 129

KLD23-02 574337 5339047 333 45 -45 147

KLD23-03 574327 5338119 334 45 -50 351

KLD23-04 574419 5338223 327 225 -50 339

KLD23-05 574223 5337887 331 155 -60 204

KLD23-06 573390 5338094 331 180 -55 399

KLD23-07 373390 5338094 331 225 -50 285

KLD23-08 573722 5339190 333 190 -50 558

KLD23-09a 573722 5339190 333 200 -48 15

KLD23-09 573722 5339190 333 200 -55 564

Coordinates in UTM NAD83 Zone 17 T datum. 2,991

TSX-V:KLDC

KIRKLAND LAKE DISCOVERIES CORP.

25 Adelaide Street East, Suite 1400, Toronto, Ontario, M5C 3A1 | kirklandlakediscoveries.com | +1 416 363 0317

The interpretative work of ALS GoldSpot has provided numerous insights and identified prospective targets

for boots-on-the-ground follow -up, complementing the geology maps of the Ontario Geological Survey.

Field crews have been mapping and sampling in recent weeks and continue to advance new prospective

areas. Observations from this work include promising structural trends, mineralization, and alteration

signatures, which have the Kirkland Lake Discoveries team enthused.

The newly named Hurricane target area, a recently re-discovered area located within a structurally complex

zone accompanied by felsic to intermediate intrusions between the Mulven and Misema Mist Lake faults,

is particularly compelling (Figure 1) . Mapping has identified silicified, and epidote altered intermediate

intrusions cut by quartz stockwork veinlets and pyrite mineralization (Figure 2). Historical results from work

completed in 1936 (Table 2) indicate samples from this area returned multi-ounce gold assays.

Figure 1 - Geological and structural interpretation of the Hurricane target by ALS Goldspot.

TSX-V:KLDC

KIRKLAND LAKE DISCOVERIES CORP.

25 Adelaide Street East, Suite 1400, Toronto, Ontario, M5C 3A1 | kirklandlakediscoveries.com | +1 416 363 0317

Figure 2 - Silicified and epidote altered rock with quartz stockwork and pyrite mineralization.

Sample ID NAD83_E NAD83N Au$ ($35/Oz) Au Oz/ton Au g/t

1 594560 53422988 7.11 0.20 6.96

2 594560 53422988 16.91 0.48 16.56

3 594540 5342290 1.01 0.03 0.99

4 594540 5342290 15.24 0.44 14.93

5 594540 5342290 2.71 0.08 2.65

6 594420 5342248 6.10 0.17 5.98

7 594420 5342248 21.34 0.61 20.90

8 594673 5342280 9.82 0.28 9.62

9 594673 5342280 43.00 1.23 42.12

10 594673 5342280 16.93 0.48 16.58

11 594673 5342280 8.47 0.24 8.30

12 594673 5342280 35.85 1.02 35.12

13 594673 5342280 26.43 0.76 25.89

14 594673 5342280 98.54 2.82 96.53

15 594673 5342280 65.02 1.86 63.69

Table 2 - Multi-ounce gold assays from 1936 – Norwood Kirkland Gold Mines.

(http://www.geologyontario.mndmf.gov.on.ca/mndmfiles/afri/data/imaging/20000005216/20007459.pdf)

Phase 2 drilling is being planned to t est many of the new target areas re- prioritized through the 2023

fieldwork, and geophysical interpretation (Figure 3). Additional exploration permits are being prepared for

submission and will cover these new areas on the Lucky Strike property . Drilling will recommence once

permits have been received.

TSX-V:KLDC

KIRKLAND LAKE DISCOVERIES CORP.

25 Adelaide Street East, Suite 1400, Toronto, Ontario, M5C 3A1 | kirklandlakediscoveries.com | +1 416 363 0317

Figure 3- 2023 field samples and areas of interest underlain by Reduced to Pole (RTP) total magnetics.

QP Statement

Mike Kilbourne, P. Geo. , a qualified person as defined in National Instrument 43- 101, has reviewed and

approved the technical content of this news release on behalf of the Company.

About Kirkland Lake Discoveries Corp.

Kirkland Lake Discoveries Corp. is a TSX Venture Exchange listed company that has recently consolidated

a district-scale and highly prospective land package in the Kirkland Lake Gold Camp in Ontario, Canada.

The properties are hosted in the Abitibi Greenstone Belt, one of the world’s best-endowed greenstone belts,

with 200+ million ounces of gold produced to date.1 The properties are host to regional and property-scale

mineralized structures that are considered second-order structures off the Larder Lake Cadillac

Deformation Zone (LLCDZ), the regional structure in the belt known to be spatially associated with the gold

mines hosted in the camp.

The properties assembled include the 100%-owned Lucky Strike Property, Goodfish-Kirana, the Arnold

property, and the optioned KL West (KLW) and KL Central (KLC) properties. The KLDC land position

comprises approximately 38,000 ha, over 1,338 claims and 29 patented claims and ranks the Company as

the largest landholder in the Kirkland Lake region.

1 Canada’s Gold Exploration Frontier: The Abitibi Greenstone Belt - https://www.visualcapitalist.com/sp/canadas-gold-exploration-

frontier-the-abitibi-greenstone-belt/

TSX-V:KLDC

KIRKLAND LAKE DISCOVERIES CORP.

25 Adelaide Street East, Suite 1400, Toronto, Ontario, M5C 3A1 | kirklandlakediscoveries.com | +1 416 363 0317

For additional information, please contact:

Danièle Spethmann, P.Geo.

Founder, President & CEO

https://www.kirklandlakediscoveries.com

+1 416 363 0317

[email protected]

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 certain “forward- looking information” and “forward- looking statements”

(collectively “forward- looking statements”) within the meaning of applicable securities legislation. All

statements, other than statements of historical fact, included herein, without limitation, statements relating

the future operations and activities of Kirkland Lake Discoveries, are forward-looking statements. Forward-

looking statements are frequently, but not always, identified by words such as “expects”, “ anticipates”,

“believes”, “intends”, “estimates”, “potential”, “possible”, and similar expressions, or statements that events,

conditions, or results “will”, “may”, “could”, or “should” occur or be achieved. Forward-looking statements in

this news release relate to, among other things, the Company’s exploration plans, including the preparation

and submission of exploration permits, and the submission of samples for analyses. There can be no

assurance that such statements will prove to be accurate, and actua l results and future events could differ

materially from those anticipated in such statements. Forward- looking statements reflect the beliefs,

opinions and projections on the date the statements are made and are based upon a number of

assumptions and estimates that, while considered reasonable by Kirkland Lake Discoveries, are inherently

subject to significant business, economic, competitive, political and social uncertainties and contingencies.

Many factors, both known and unknown, could cause actual resul ts, performance or achievements to be

materially different from the results, performance or achievements that are or may be expressed or implied

by such forward- looking statements and the parties have made assumptions and estimates based on or

related to many of these factors. Such factors include, without limitation, the ability to complete proposed

exploration work, the results of exploration, continued availability of capital, and changes in general

economic, market and business conditions. Readers shoul d not place undue reliance on the forward-

looking statements and information contained in this news release concerning these items. Kirkland Lake

Discoveries does not assume any obligation to update the forward- looking statements of beliefs, opinions,

projections, or other factors, should they change, except as required by applicable securities laws.