Montreal, Quebec--(Newsfile Corp. - April 1, 2026) - Sirios Resources Inc. (TSXV: SOI) (OTCQB: SIREF) ("Sirios" or the "Company") plans an extensive, fully-funded 2026 exploration program at several of its gold exploration projects in the Eeyou Istchee James Bay area of Quebec. Details of the proposed program are provided below.

Cheechoo Gold Project

An initial expansion drilling phase of approximately 25,000 m will begin in the second quarter of 2026, with the objective of updating the resource estimate. Three sectors are targeted in this first phase, namely:

1. ~15,000 m on the modeled exploration target, as presented in the resource estimate (ref.: press release dated July 10, 2025) (see Figure 1)
2. ~7,500 m in the metasediments at the northeast contact of the main intrusive within the conceptual pit shell limiting the current mineral resources (see Figure 2)
3. ~2,500 m in the higher-grade Eclipse sector west of the conceptual resource pit shell (see Figure 2).

Figure 1: Exploration target for the 15,000m proposed drill program at Cheechoo

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/2313/290848_c57cefcba4b20a37_002full.jpg

Figure 2: Exploration targets for the Eclipse area and the Metasediments Extension at the Cheechoo Project

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/2313/290848_c57cefcba4b20a37_003full.jpg

"We're looking forward to getting drills turning at Cheechoo in the coming weeks," said Dominique Doucet, Executive Chairman and Head of Exploration at Sirios. "In addition, a second phase of at least 10,000 m of exploration and follow-up drilling is planned for the first quarter of 2027. The targeting and timing of this phase will be contingent on the results of the first phase."

"This comprehensive 2026 drill program at Cheechoo will enable us to publish a new resource estimate," added Jean-Félix Lepage, Sirios' CEO. "We will then use that information to complete a Preliminary Economic Assessment (PEA) in the first half of 2027."

Aquilon

A work program is planned for the third quarter of 2026 to follow up on the encouraging results obtained during the 2025 drilling campaign. This program will be developed in April by Sirios and its partner Sumitomo Metal Mining Canada (Sumitomo). Sirios remains the operator of the Aquilon project, now shared 49% by Sirios and 51% by Sumitomo. The work program will be announced once it has been confirmed by the partners.

PLEX

The PLEX project is the subject of compilation work by Sirios' experienced exploration team. A work plan will be developed before the end of the third quarter of 2026 with the objective of initiating exploration work in 2027.

The project spans 21,000 hectares along a greenstone belt at the contact of the La Grande and Opinaca sub-provinces, which constitutes the main gold metallotect for Eeyou Istchee James Bay. PLEX includes the Orfée zone, which was the subject of a 2003 estimate of 125,000 ounces at 14.5 g/t gold.^[1] This estimate is considered a historical estimate, which is not compliant with National Instrument 43-101 and should not be relied upon as current mineral resources.

Fagnant

The Fagnant project is located approximately 60 km east of Whapmagoostui and Kuujjuarapik, which are, respectively, Cree and Inuit communities on the border of Eeyou Istchee James Bay and Nunavik. The exclusive exploration rights (EER) acquired at Fagnant, totaling 98 km², cover more than 80% of the Archean volcano-sedimentary belt of the Great Whale.

Between 1997 and 2000, about thirty gold or polymetallic (Au, Ag, Pb, Zn, Cu) showings were discovered by prospecting. In 2018, only a brief inspection of the showings was conducted by the former holders, validating the 1997-2000 results with selected samples grading up to 44 g/t gold.^[2] Sirios considers these results to be historical within the meaning of NI 43-101. There has been no sufficient work by a qualified person to classify them as current.

A helicopter-borne magnetic survey covering the entire property will be conducted in Q2 2026, and will be the first significant survey initiated by Sirios since acquiring this project by map designation in 2024.

Marketing Engagement

The Company announces that it has entered into a marketing services agreement with Resource Stock Digest ("RSD"), a company based out of Texas, effective March 30, 2026, pursuant to which, among other things, RSD has agreed to provide certain promotional services to the Company in accordance with Policy 3.4 - Investor Relations, Promotional and Market-Making Activities of the TSX Venture Exchange (the Exchange"). RSD has been engaged for a 3-month advertising and marketing program for total cash consideration of USD $100,000. RSD conducts interviews with the Company and produces Company-approved content that is distributed to RSD's subscriber base and connects issuers to the investment community across North America. There are no performance factors contained in the agreement, and RSD will not receive common shares or options as compensation. The agreement is subject to the approval of the Exchange. RSD is owned and operated by Gerardo Del Real and Nick Hodge and its contact details are as follows: Gerardo Del Real, 2051 Gattis School Rd, Ste. 540 PMB 176, Round Rock, TX 78664, USA; Email: editor@resourcestockdigest.com.

About the Cheechoo Gold Project

Cheechoo is located approximately 15 km from the Éléonore mine and near infrastructure including, among others, roads and hydroelectric facilities, in Eeyou Istchee James Bay, Canada. Cheechoo is at the resource development stage with 35 Mt Indicated resources at 1.12 g/t representing 1,262 koz, and 42.7 Mt of Inferred resources at 1.23 g/t, representing 1,688 koz. In addition, a conceptual exploration target ranging from 31 to 40 million tonnes of mineralization grading between 1.27 and 1.45 g/t Au has been estimated. Readers should refer to the mineral resource estimate report, Technical Report On The Cheechoo Project With An Updated Mineral Resource Estimate For The Cheechoo Gold Deposit, Eeyou Istchee James Bay, Quebec, Canada, dated July 1, 2025, by Pierre-Luc Richard of PLR Resources Inc., an independent and qualified person as defined by National Instrument 43-101. The complete technical report is available on SEDAR+ under Sirios' profile, as well as on the Company's website.

The mineralization at Cheechoo is of the "reduced intrusion-related gold system" type, with the main host rock being a tonalite intrusion. However, gold can also be found in meta-sedimentary rocks outside the intrusion, representing additional potential. The 2026 drilling program will verify the potential of the exploration target.

Qualified Person

The scientific and technical information in this press release has been reviewed and approved by Dominique Doucet, P. Eng., a Qualified Person under National Instrument 43-101. Mr. Doucet is Executive Chairman and Head of Exploration of Sirios.

About Sirios

Sirios Resources is a Quebec-based mining exploration company focused on developing its high-potential gold project portfolio in the Eeyou Istchee James Bay region, Canada. Sirios completed the acquisition of OVI Mining on February 27, 2026, a landmark event in the Company's history.

Cautionary Note Regarding Forward-Looking Statements

This press release contains "forward-looking statements" within the meaning of applicable Canadian securities laws, based on expectations, estimates, and projections as of the date of this press release. Forward-looking statements involve risks, uncertainties, and other factors that could cause actual events, results, performance, expectations, and opportunities to differ materially from those expressed or implied in these forward-looking statements. Factors that could cause actual results to differ materially from those indicated in these forward-looking statements include, without limitation: investment and operating costs that differ materially from estimates; the preliminary nature of metallurgical test results; delays or failures in obtaining required governmental, environmental, or other authorizations; uncertainties related to the availability and cost of future necessary financing; changes in financial markets; inflation; fluctuations in metal prices; delays in project development; other risks related to the mining exploration and development industry; and risks disclosed in the Company's public documents on SEDAR+ at www.sedarplus.ca. Although the Company believes that the assumptions and factors used to prepare the forward-looking statements contained in this press release are reasonable, readers should not place undue reliance on this information, which is valid only as of the date of this press release, and no assurance can be given that these events will occur or will occur within the indicated timeframes. The Company disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by applicable law.

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

^[1] D'AMOURS, C. (2003). Modélisation géostatistique et estimation des ressources. Géopointcom. Internal report, Virginia Gold Mines. 16 pages, filed on SEDAR on April 3, 2006
^[2] HUOT, F. (2019) Technical Report and Recommendations, Field Visit 2018, Lake Fagnant Project, prepared for Harfang Exploration Inc.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/290848

Source: Sirios Resources Inc.