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Grande Portage Resources Advances 2026 Drill Program and Field Activities, Confirms 100% Warrant Exercise

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Grande Portage Resources (OTCQX: GPTRF) reported it has reached the midpoint of its 2026 drill program at the New Amalga Gold Project in southeast Alaska, with 1,605 metres of 3,255 planned metres (49%) drilled and 5 of 12 holes completed as of August 9.

The company is pivoting from pure exploration toward collecting extensive hydrogeological and geotechnical data to support mine planning, environmental review and permitting. Environmental infrastructure is advancing, including a river-monitoring gauge and foundations for two meteorological towers, alongside wetlands mapping and wildlife, botanical and geochemical baseline studies.

All 6,005,431 outstanding warrants were exercised at $0.25, generating about $1.50 million to fund field programs, team expansion and corporate purposes. Subject to TSXV approval, 275,000 incentive stock options were granted at $0.35, expiring August 12, 2031. The New Amalga NI 43-101 MRE includes 1,438,500 oz indicated gold at 9.47 g/t and 515,700 oz inferred gold at 8.85 g/t.

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Positive

  • 100% warrant exercise of 6,005,431 warrants raised approximately $1.50 million in proceeds
  • Drilling midpoint reached with 1,605 metres (49%) of 3,255 planned metres and 5 of 12 holes completed
  • Robust indicated gold resource of 1,438,500 oz at 9.47 g/t Au (4,726,000 tonnes)
  • Inferred gold resource of 515,700 oz at 8.85 g/t Au (1,813,000 tonnes)
  • Environmental baseline work advanced with wetlands mapping, wildlife, botanical and geochemical studies plus monitoring infrastructure

Negative

  • Grant of 275,000 stock options at $0.35 per share introduces potential future share dilution

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Vancouver, British Columbia--(Newsfile Corp. - August 13, 2026) - Grande Portage Resources Ltd. (TSXV: GPG) (OTCQX: GPTRF) (FSE: GPB) ("Grande Portage" or the "Company") is pleased to announce that it has reached the midpoint of the 2026 drilling program at the New Amalga Gold Project located in southeast Alaska.

As of August 9, crews have drilled 1,605 metres out of 3,255 planned metres (49%) and completed 5 out of 12 planned drillholes. Meanwhile large amounts of critical data have been collected on hydrogeological and geotechnical conditions in key areas of the deposit along with additional resource definition. This rock mass data is of great importance for the upcoming environmental review and permitting process as well as to inform mine development plans.

Ian Klassen, the Company's President & CEO said, "This year's drill program marks a pivot from pure exploration to a focus on data collection for mine development planning. This adds complexity including a larger amount of personnel, equipment, and helicopter logistics. Grande Portage would like to thank all of our contractors and personnel for their effective coordination and successful efforts in reaching the midpoint of the 2026 drilling program."

In addition to drilling, construction activities have advanced for the development of environmental monitoring infrastructure at the site, including the installation of a river-monitoring gauge station (Fig. G) as well as completion of concrete works for the foundation of the first of two planned meteorological towers (Fig. H & Fig. I). Completion of the second tower's foundation is scheduled for August with tower erection planned in September.

Environmental baseline data collection has also made excellent progress with the completion of wetlands mapping for the project area as well as ongoing wildlife, botanical and geochemical studies.

Photos from 2026 field program:

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Fig. A: Drill pad construction

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Fig. B: Drilling operations

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Fig. C: Core logging tent at the drill rig

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Fig. D: Logging core while still in the split-tube core barrel to preserve maximum geotechnical information

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Fig. E: First core of 2026

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Fig. F: Ongoing drilling in all weather conditions

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Fig. G: New river monitoring gauge installed in Herbert River at project site

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Fig. H: Aerial view of construction work at meteorological tower site

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Fig. I: Construction equipment transported by helicopter to meteorological tower site

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Kyle Mehalek, P.E., is the QP within the meaning of NI 43-101 and has reviewed and approved the technical disclosure in this release. Mr. Mehalek is independent of Grande Portage within the meaning of NI 43-101.

Full Share Purchase Warrant Exercise

The Company is pleased to announce that shareholders have exercised 100% of the 6,005,431 outstanding common share purchase warrants at an exercise price of $0.25 per warrant, ahead of their August 12, 2026 expiry date. The warrant exercises have generated $1.50 million in additional proceeds, further strengthening the Company's treasury and financial position.

The proceeds will be used to advance the Company's ongoing field programs in S.E Alaska, expand its technical team, and support general corporate activities as Grande Portage continues to advance its exploration and development initiatives.

Ian Klassen further commented, "We remain deeply appreciative of our long-standing and supportive shareholders. The exercise of these warrants further strengthens Grande Portage's financial position and enhances our financial flexibility as we continue to advance exploration and field activities at the New Amalga Gold Project. This continued shareholder support provides a strong foundation as we build momentum toward the next stage of the project's development."

Incentive Stock Options

The Company wishes to announce that, subject to TSX Venture Exchange approval, it has granted incentive stock options to various advisors & consultants to purchase up to 275,000 common shares exercisable on or before August 12, 2031 at a price of $0.35 per share.

About Grande Portage

Grande Portage Resources Ltd. is a publicly traded mineral exploration company focused on advancing the New Amalga Mine project, the outgrowth of the Herbert Gold discovery situated approximately 25 km north of Juneau, Alaska. The Company holds a 100% interest in the New Amalga property. The New Amalga gold system is open to length and depth and is host to at least six main composite vein-fault structures that contain ribbon structure quartz-sulfide veins. The project lies prominently within the 160km long Juneau Gold Belt, which has produced over eight million ounces of gold.

The Company's updated NI#43-101 Mineral Resource Estimate (MRE) reported at a base case mineral resources cut-off grade of 2.5 grams per tonne gold (g/t Au) and consists of: an Indicated Resource of 1,438,500 ounces of gold at an average grade of 9.47 g/t Au (4,726,000 tonnes); and an Inferred Resource of 515,700 ounces of gold at an average grade of 8.85 g/t Au (1,813,000 tonnes), as well as an Indicated Resource of 891,600 ounces of silver at an average grade of 5.86 g/t Ag (4,726,000 tonnes); and an Inferred Resource of 390,600 ounces of silver at an average grade of 7.33 g/t silver (1,813,000 tonnes). The MRE was prepared by Dr. David R. Webb, Ph.D., P.Geol., P.Eng. (DRW Geological Consultants Ltd.) with an effective date of July 17, 2024. Additional information on the New Amalga Mine project is available in the technical report titled "Preliminary Economic Assessment for the New Amalga Gold Project Juneau District, Southeast Alaska" dated February 11, 2026, which is available under Grande Portage's SEDAR+ profile at www.sedarplus.ca.

ON BEHALF OF THE BOARD
"Ian Klassen"
Ian M. Klassen
President & Chief Executive Officer
Tel: (604) 899-0106
Email: Ian@grandeportage.com

Cautionary Statement Regarding Forward-Looking Information

This news release includes certain "forward-looking statements" under applicable Canadian securities legislation. Forward-looking statements include estimates and statements that describe the Company's future plans, objectives or goals, including words to the effect that the Company or management expects a stated condition or result to occur. Forward-looking statements may be identified by such terms as "believes", "anticipates", "expects", "estimates", "may", "could", "would", "will", or "plan". Forward-looking statements or information contained in this release include, but are not limited to, statements or information with respect to: the commercial offtake, equity investment and construction loan and overrun facility from Ocean Partners, including terms, timing, benefits and synergies and use of proceeds thereof; Ocean Partners' future share holdings; and advancement of the Project, including the proposed path to production timeline, economics and timing of the Environmental Impact Statement. Since forward-looking statements are based on assumptions and address future events and conditions, by their very nature they involve inherent risks and uncertainties, These assumptions, risks, uncertainties and other factors include, among others: ability to finalize definitive agreements relating to the commercial offtake, equity investment and construction loan and overrun facility, complete the transactions contemplated herein, and to obtain all necessary approvals; risks associated with the exploration and development of the New Amalga Mine and our mineral resources; including obtaining all necessary approvals and the timing thereof; the current or future price of gold, silver and other commodities; anticipated costs, expenses and working capital requirements; ability to meet the proposed production timeline for the Project; general business and economic conditions and political climate; and other assumptions, risks, uncertainties and other factors as described in the Company's filings with Canadian securities regulators. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. The Company disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, other than as required by law.

NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICE PROVIDER (AS THAT TERM IS DEFINED UNDER THE POLICIES OF THE EXCHANGE) ACCEPTS RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS NEWS RELEASE

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FAQ

What progress has Grande Portage Resources (GPTRF) made on the 2026 New Amalga drill program?

Grande Portage reported reaching the midpoint of its 2026 drill program, completing 1,605 metres of 3,255 planned metres and 5 of 12 drillholes. According to Grande Portage, the work also gathers critical hydrogeological and geotechnical data to support mine development planning and future permitting.

How much capital did Grande Portage Resources (GPTRF) raise from the 2026 warrant exercise?

Grande Portage raised about $1.50 million from the full exercise of 6,005,431 warrants at $0.25 each. According to Grande Portage, proceeds will fund ongoing field programs in southeast Alaska, expand its technical team, and support general corporate activities and project advancement.

What does the 100% warrant exercise mean for Grande Portage Resources (GPTRF) shareholders?

The 100% warrant exercise strengthens Grande Portage’s treasury by about $1.50 million without a discounted new financing. According to Grande Portage, this enhances financial flexibility to advance exploration and development at New Amalga, reflecting continued shareholder support ahead of the warrants’ August 12, 2026 expiry.

What mineral resources have been reported for the New Amalga Gold Project by Grande Portage (GPTRF)?

New Amalga hosts an indicated resource of 1,438,500 oz gold at 9.47 g/t and 515,700 oz inferred gold at 8.85 g/t. According to Grande Portage, the NI 43-101 MRE also includes 891,600 oz indicated silver and 390,600 oz inferred silver at stated grades.

What new stock options did Grande Portage Resources (GPTRF) grant in August 2026?

Subject to TSX Venture Exchange approval, Grande Portage granted options to buy up to 275,000 common shares at $0.35, expiring August 12, 2031. According to Grande Portage, these incentive options were issued to various advisors and consultants supporting the company’s activities.

How is Grande Portage Resources (GPTRF) advancing environmental baseline work at New Amalga?

Grande Portage is installing a river-monitoring gauge station, constructing meteorological tower foundations, and completing wetlands mapping. According to Grande Portage, ongoing wildlife, botanical and geochemical studies collect baseline data needed for future environmental review, permitting, and mine development planning at the New Amalga project.

Where is Grande Portage Resources’ New Amalga Gold Project located and what is its regional context?

New Amalga lies about 25 km north of Juneau, Alaska, within the 160 km Juneau Gold Belt. According to Grande Portage, this belt has historically produced over eight million ounces of gold, and New Amalga hosts multiple composite vein-fault structures with quartz-sulfide veins.