File: '\\swfile\EmailIn\20250919 162038 Attachment 20250919-07 Great Plains Increases PP.doc'

Great Plains Metals Corp.

Contact: Investor Relations Friday, September 19, 2025

Phone (604) 684-2181 (No.2025-08-07)

Not for distribution to U.S. newswire services or for dissemination in the United States

GREAT PLAINS METALS INCREASES PRIVATE PLACEMENT

Vancouver, BC, Canada - Friday, September 19, 2025 - Great Plains Metals Corp. ("Great Plains" or "the Company", TSX-V: GPS, Frankfurt Exchange: 8VC) is pleased to announce that further to its news release dated September 6, 2025 and due to high investor interest, it is increasing its previously announced non-brokered private placement (the "Private Placement") to up to 16,600,000 common shares at a price of $0.05 per common share for gross proceeds of up to $830,000.

The proceeds will be used to advance the Company's resource projects and for working capital purposes.

The Private Placement is subject to TSX Venture Exchange approval and all securities issued will be subject to a four-month hold period.

The securities described herein have not been, and will not be, registered under the U.S. Securities Act of 1933, as amended (the "U.S. Securities Act"), or any state securities laws, and accordingly, may not be offered or sold within the United States or to US persons except in compliance with the registration requirements of the U.S. Securities Act and applicable state securities requirements or pursuant to exemptions therefrom. No securities regulatory authority has reviewed or approved of the contents of this news release. This press release does not constitute an offer to sell or a solicitation to buy any securities in any jurisdiction in which such offer, solicitation or sale would be unlawful.

GREAT PLAINS METALS CORP.

For further information, please contact:

Peeyush Varshney

Phone: (604) 684-2181

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.