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GRANDE PORTAGE APPLIES FOR ROAD EASEMENT FROM STATE OF ALASKA Easement to Facilitate Near-Term Exploration Logistics for New Amalga Gold Project & Secure Road Route Spanning One-Third of Distance from Public Highway to Project Site

Corporate Updates

1050 - 1090 West Georgia Street

Vancouver, British Columbia. V6E 3V7

GRANDE PORTAGE APPLIES FOR ROAD EASEMENT FROM

STATE OF ALASKA

Easement to Facilitate Near-Term Exploration Logistics for New Amalga Gold Project & Secure Road

Route Spanning One-Third of Distance from Public Highway to Project Site

Vancouver, British Columbia —August 21, 2025 – Grande Portage Resources Ltd. (TSXV: GPG)

(OTCQB: GPTRF) (FSE: GPB) ("Grande Portage" or the "Company") is pleased to announce that it has applied

for a State of Alaska easement related to its New Amalga Gold project in southeast Alaska. This easement

application incorporates a proposal for development of approximately 1.3 miles (2 km) of gravel road along with

two equipment staging areas.

Extending from Glacier Highway across State of Alaska property, development of this road segment will greatly

facilitate the Company’s helicopter-supported exploration efforts by establishing an equipment staging area much

closer to the project site. The helicopter shuttle distance for transporting drilling equipment and supplies would

be reduced by over 60% for each cycle compared to the previous staging area located in the Juneau Mendenhall

Valley suburbs.

Ian Klassen, President and CEO comments: "The submission of this easement application is an important step

for the project. The proposed road development and equipment staging areas will not only enhance the efficiency

of our exploration efforts but will also reduce the impact of helicopter noise on residential areas of the

Mendenhall Valley. Furthermore, this road segment will comprise a significant proportion of the overall road

development required to ultimately establish surface access to the project site.”

This initial road segment would span approximately one-third of the total distance from Glacier Highway to the

project site, ending at the boundary between State of Alaska and US Forest Service land. Further road

development will require separate federal environmental review and permitting. Baseline environmental studies

are ongoing in order to support future federal submissions.

The future facilities at the project site are envisioned to include a small-footprint underground mining operation

without an ore processing plant or tailings disposal landfill. Due to the resource location near tidewater and less

than 4 miles (6.5km) from existing paved highway (Fig. 1), the Company considers off-site processing by a third

party to be the most favorable configuration for the project.

1050 - 1090 West Georgia Street

Vancouver, British Columbia. V6E 3V7

- 2 -

Fig. 1: Location of the New Amalga Gold Project

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.

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.

1050 - 1090 West Georgia Street

Vancouver, British Columbia. V6E 3V7

- 3 -

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 Infe rred 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.

ON BEHALF OF THE BOARD

"Ian Klassen"

Ian M. Klassen

President & Chief Executive Officer

Tel: (604) 899-0106

Email: [email protected]

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". Since forward-looking statements are based on assumptions

and address future events and conditions, by their very nature they involve inherent risks and uncertainties as

described in the Company's filings with Canadian securities regulators. There can be no assuranc e 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.

Please note that under National Instrument 43 -101, the Company is required to disclose that it has not based any

production decision on NI 43 -101-compliant reserve estimates, preliminary economic assessments, or feasibility

studies, and historically production decisions made without such reports have increased uncertainty and higher

technical and economic risks of failure. These risks include, among others, areas that are analyzed in more detail in

a feasibility study or preliminary econ omic assessment, such as the application of economic analysis to mineral

resources, more detailed metallurgical and other specialized studies in areas such as mining and recovery methods,

market analysis, and environmental, social, and community impacts. Any decision to place the New Amalga Mine

into operation at levels intended by management, expand a mine, make other production -related decisions, or

otherwise carry out mining and processing operations would be largely based on internal non-public Company data,

and on reports based on exploration and mining work by the Company and by geologists and engineers engaged by

the Company.

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