Mr. Ian Klassen reports

NEW LIDAR SURVEY VALIDATES & SUPPORTS GRANDE PORTAGE RESOURCES' DEVELOPMENT PLANS AT THE NEW AMALGA GOLD PROJECT - UPDATED PROJECT SUMMARY

Grande Portage Resources Ltd. has received survey data from an aerial lidar scan at the New Amalga gold property in southeastern Alaska, a critical input for advancing engineering and environmental work at the project.

Lidar (light detection and ranging) is a high-resolution, laser-based mapping technique that uses rapid pulses of laser light and precise time-of-flight measurements to calculate the distance to surrounding surfaces. By sweeping the laser across an area and recording millions of return points, it generates a dense point cloud that represents the 3-D geometry of terrain, vegetation or objects.

This aerial scan, conducted by an Anchorage-based team from NV5 Geospatial, covers the area of potential project infrastructure development and access road corridor. The new survey validates the planned locations of the mine's surface facilities and complements a previous scan, which covered the area surrounding and directly above the resource veins.

Lidar data are critically important for a variety of engineering, environmental and exploration purposes, including:

• Determining optimal locations for buildings and roads to minimize the amount of earthworks and surface disturbance;
• Identifying natural drainage channels and potential wetland areas to be subsequently confirmed by field surveys;
• Determining the density of vegetation and the height of the tree canopy relative to the ground surface;
• Mapping large-scale geotechnical features and structures where bedrock is exposed to inform mine design;
• Identifying small channels and gullies where an exposed vein has preferentially eroded relative to the wall rock, a valuable exploration tool to identify potential vein outcrops.

Ian Klassen, president and chief executive officer, commented: "Modern lidar scanning is an extremely valuable technology for the New Amalga gold project, enabling surface data to be collected with an extremely high degree of detail in a short period of time. This results in more precise early engineering work while focusing and expediting our fieldwork and environmental data collection efforts, key factors enabling the project to advance through the regulatory process and towards mine development."

The New Amalga gold project remains open to expansion in multiple directions and hosts an indicated resource of 1,438,500 ounces of gold at an average grade of 9.47 grams per tonne gold (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). The current development concept envisions a small-footprint underground mining operation with third party off-site processing, eliminating the need for an on-site mill or tailings storage facility.

Project highlights:

• A 100-per-cent interest in the New Amalga gold project, located near infrastructure only 25 kilometres north of Juneau, Alaska, and six kilometres from paved all-season highway;
• The property is host to at least eight large, long, gold-bearing mesothermal veins;
• 240 drill holes from 55 platforms totalling approximately 65,000 metres confirm a large gold-quartz system;
• Past drilling produced multiounce assays on several veins; select samples include:
  • Deep Trench vein: 15.3 m grading 37.1 g/t Au, 8.3 m grading 58.6 g/t Au and 11.6 m grading 28.3 g/t Au;
  • Goat vein: 2.1 m grading 74.2 g/t Au and 6.3 m grading 15.7 g/t Au;
  • Main vein: 3.1 m grading 79.2 g/t Au, 2.1 m grading 37.2 g/t Au and 3.1 m grading 13.9 g/t Au;
  • Ridge vein: 1.5 m grading 43.0 g/t Au and 1.5 m grading 29.2 g/t Au;
  • Sleeping Giant vein: 2.1 m grading 15.4 g/t Au and 3.2 m grading 20.7 g/t Au;
• The company's updated National Instrument 43-101 mineral resource estimate (MRE) with an effective date of July 17, 2024, reported 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 deposit is open to the north, south and at depth;
• Goat vein surface outcrop channel samples assayed 129.02 g/t gold (3.76 ounces per ton) and 290 g/t gold (8.46 ounces per ton) with 224 g/t silver (6.53 ounces per ton);
• Lidar survey of property discovered numerous targets -- the first of these tested confirmed gold discovery;
• Received excellent metallurgical recoveries up to 98.2 per cent;
• Completed more than six years of environmental baseline water sampling;
• Current development strategy envisions a small-footprint underground mining operation with third party off-site processing, eliminating the need for an on-site mill or tailings storage facility; This configuration reduces capital costs, greatly minimizes the project's environmental footprint and facilitates permitting;
• LOI (letter of intent) signed with Goldbelt Inc. (an Alaska native corporation organized under the Alaska Native Claims Settlement Act) for development of an ore export terminal at Cascade Point, Goldbelt's privately held parcel located only 22 kilometres from the project site;
• NI 43-101 preliminary economic assessment in progress, expected completion Q1 2026.

Kyle Mehalek, PE, is the qualified person 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 Resources Ltd.

Grande Portage 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 kilometres north of Juneau, Alaska. The company holds a 100-per-cent 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-sulphide veins. The project lies prominently within the 160-kilometre-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 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 Ag (1,813,000 tonnes). The MRE was prepared by Dr. David R. Webb, PhD, PGeol, PEng (DRW Geological Consultants Ltd.), with an effective date of July 17, 2024.

We seek Safe Harbor.