File: '\\swfile\EmailIn\20250908 143007 Attachment SGRO - NR Primus Termination - Sept 8 2025 (1).docx'

NEWS RELEASE

For Immediate Release

CORPORATE UPDATE: SIERRA & PRIMUS TERMINATE OPTION AGREEMENTS

Surrey, B.C. - September 8, 2025 - Sierra Grande Minerals Inc. (CSE: SGRO) ("Sierra" or the "Company") announces that it has mutually and formally terminated its property option agreements with Primus Resources, L.C. ("Primus") relating to the Betty East, B&C Springs, and Glitra/Satellite properties.

Primus has issued a confirmation notice of termination for the Betty East, B&C Springs and Glitra/Satellite property option agreements, resuming full control of those claims.

Sierra will continue to evaluate and pursue new mineral exploration and development opportunities that align with its growth strategy and have already identified key projects for consideration, including a large group of mineral claims in Pershing County, Nevada, additionally, the Company's management team will be visiting several exploration projects in West Africa in Q4, 2025. The Company looks forward to providing additional guidance to the market on these matters in the near future.

The Company also announces that Ben Kramer-Miller has resigned as a director of Sierra, effective immediately. The Board thanks Mr. Kramer for his contributions and wishes him success in his future endeavors. The resulting board of directors is Sonny Janda, Jared Scharf, Daryl Ware-Lane and Shaun Dykes.

ON BEHALF OF THE BOARD OF DIRECTORS

Sonny Janda, CEO and Director

www.sierragrande.ca

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

This news release includes certain statements that constitute "forward-looking information" within the meaning of applicable securities law, including without limitation, statements that address the timing and content of certain agreements and development. Forward-looking statements address future events and conditions and are necessarily based upon a number of estimates and assumptions. While such estimates and assumptions are considered reasonable by the management of the Company, they are inherently subject to significant business, economic, competitive and regulatory uncertainties and risks, including the ability of the Company to raise the funds necessary to fund its projects and, accordingly, may not occur as described herein or at all. Actual results may differ materially from those currently anticipated in such statements. Factors that could cause actual results to differ materially from those in forward looking statements include Covid-19 restrictions, market prices, exploitation and exploration successes, the timing and receipt of government and regulatory approvals, and continued availability of capital and financing and general economic, market or business conditions. Readers are referred to the Company's filings with the Canadian securities regulators for information on these and other risk factors, available at www.sedar.com. Investors are cautioned that forward-looking statements are not guarantees of future performance or events and accordingly are cautioned not to put undue reliance on forward-looking statements due to the inherent uncertainty of such statements. The forward-looking statements included in this news release are made as of the date hereof and 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 expressly required by applicable securities legislation."