(via TheNewswire)

Vancouver, British Columbia – September 4, 2026 – TheNewswire - Bighorn Metals Corp. (CSE: HRNY) (the “ Company ”) is pleased to announce that it has entered into Exploration Lease with Option to Purchase Agreement (the “Agreement” ) with MSM Resources LLC (the “MSM ”), granting the Company exclusive right for exploration and option to acquire a 100% undivided interest in fee land and patented mining claims in the Marietta property (the “Property” or the “Marietta Project” ), located within Mineral County, Nevada in Silver Star Mining District in the Excelsior Mountains .

Transaction Terms

Under the Agreement, effective September 3, 2026, Bighorn has an initial term of three years, with two further three-year renewal terms available at the Company’s election, during which it may explore the Property and elect, at any time, to exercise its option to acquire a 100% undivided interest in the Property.

The Company is required to make an initial lease payment of US$100,000 to MSM within 30 days of the Effective Date, followed by annual minimum payments of US$100,000 on each of the first, second and third anniversaries of the Effective Date. None of these lease payments will be credited against the purchase price payable on exercise of the purchase option.

To keep the option in good standing, the Company is also required to incur exploration work expenditures on the Property of US$50,000 within 12 months of the Effective Date, a further US$100,000 within 24 months of the Effective Date, and a further US$100,000 within 36 months of the Effective Date, for aggregate committed expenditures of US$250,000 over the initial three-year term.

The Agreement contemplates that Bighorn may exercise its option to acquire a 100% undivided interest in the Property for a purchase price of US$2,500,000, the purchase price to be paid in cash. On exercise of the option, the parties are required to use diligent efforts to close the conveyance of the Property within 30 days of Bighorn’s notice of election, at which time the Company would pay the purchase price and MSM would deliver a deed conveying a 100% undivided interest in the Property free and clear of encumbrances.

At closing of the purchase option, the Property will become subject to a 2.0% production royalty (the “Royalty” ) in favour of MSM, calculated on Gross Returns from the production and sale of minerals from the Property. Bighorn may purchase one-half of this royalty (1.0%) from MSM at any time prior to commencement of commercial production for a cash payment of US$1,000,000, which would reduce the royalty burden on the Property to an aggregate 1.0%.

The Marietta Property

The Marietta Property is located in the Silver Star Mining District, Excelsior Mountains, Mineral County, Nevada. The Property comprises two parcels held by MSM: the Marietta Patents (Mineral County Assessor Parcel No. 009-030-03) and the Marietta Townsite (Mineral County Assessor Parcel No. 007-240-09), situated within Sections 29 through 32, Township 5 North, Range 33 East of the Mount Diablo Meridian, Mineral County, Nevada.

The Marietta Patents consist of 12 patented lode mining claims: the Marietta and Marietta No. 2 claims (Survey No. 4263); the Glengary No. 6, Glengary No. 7, Glengary No. 11 and Marietta No. 4 claims (Survey No. 4461); and the Glengary No. 1, Glengary No. 2, Glengary No. 3, Glengary No. 4, Glengary No. 12, Glengary No. 13 and Glengary No. 14 claims (Survey No. 4462). The Marietta Townsite parcel adjoins the patented claims within Section 32 of the same township and range.

About Bighorn Metals Corp.

The Company is an exploration-stage natural resource company engaged in the evaluation, acquisition, and exploration of mineral properties, with a view to advancing prospective mineral properties through exploration and evaluation.

The Company holds an option to acquire the Loljuh Property (the “Property”), which is located in the Omineca Mining Division of British Columbia.  The Property consists of one claim covering a surface area of 1,656.73 hectares in the Omineca Mining Division of central British Columbia, Canada, 40 km south of the community of Smithers or 32 km west of the community of Houston. The Property is prospective for porphyry copper-gold mineralization.  

Geochemical work conducted in 2019 outlined several areas of anomalous gold and copper in soil.  These surveys were widespread with lines 400 meters apart and samples taken on 200-meter centers. Rock sampling in 2019 also returned anomalous values of copper and gold from several sites within the plateau area.  The aeromagnetic survey outlined several areas of alteration.  

On behalf of the Board of Directors of:

Bighorn Metals Corp.

“Reno J. Calabrigo”

Reno J. Calabrigo

Chief Executive Officer

Phone: 1-877 913-1912

Neither the Canadian Securities Exchange nor its regulation services provider accepts responsibility for the adequacy or accuracy of this release.

Forward-Looking Information

This news release contains “forward-looking information” within the meaning of applicable Canadian securities laws. Forward-looking information in this news release includes statements regarding the Company’s strategic objectives and long-term vision; the prospective nature and mineral potential of the Property; the Company’s intention to evaluate, acquire, explore and potentially advance mineral properties toward production; and the potential advancement and development of the Property.

Forward-looking information is based on assumptions that management considers reasonable as of the date of this news release, including assumptions regarding the continued availability of the Company’s management and directors, the availability of financing on acceptable terms, the Company’s ability to maintain and exercise its option in respect of the Property, the receipt of required regulatory and other approvals, and the accuracy of existing geological and exploration information.

Forward-looking information is subject to known and unknown risks, uncertainties and other factors that may cause actual results or events to differ materially from those anticipated, including risks associated with mineral exploration and development, the speculative nature of exploration results, the absence of known mineral resources or reserves on the Property, the Company’s ability to obtain financing, commodity prices, title and permitting matters, environmental and regulatory risks, and the Company’s ability to retain qualified personnel and execute its business strategy. There can be no assurance that exploration of the Property will result in the discovery of a mineral resource or reserve or that the Property will ever be placed into production.

Although the Company believes that the assumptions and expectations reflected in such forward-looking information are reasonable, undue reliance should not be placed on forward-looking information. The Company undertakes no obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, except as required by applicable law.

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