en.Wedoany.com Reported - Canadian exploration company Grande Portage Resources Ltd. (TSXV: GPG, OTCQX: GPTRF, FSE: GPB) announced on July 6, 2026, that it has completed preliminary cemented backfill slurry strength tests at its New Amalga gold project, located 25 kilometers north of Juneau, Alaska, USA. The test results show that all samples met or exceeded the strength standards required for the up-hole longhole open stoping method, providing key technology validation for the project's low-environmental-impact underground mining plan.
Grande Portage Resources is a junior mining exploration company headquartered in Vancouver, British Columbia, Canada, focused on its 100%-owned New Amalga high-grade gold project. This project is one of the gold projects with the best infrastructure conditions in Alaska, located just 25 kilometers from the state capital Juneau and only 6 kilometers from a year-round paved highway. According to the Preliminary Economic Assessment (PEA) effective February 11, 2026, at a gold price of $3,200 per ounce, the project has an after-tax net present value of $721 million and an internal rate of return of 56%.
The cemented backfill slurry samples tested in this program used a 4% cement content and underwent uniaxial compressive strength testing after curing periods of 10 and 17 days. Based on the test results, the company plans to use waste rock generated from mine development and ore sorter tailings as backfill materials. Company President and CEO Ian Klassen stated that this is a significant milestone in reducing project risk, validating that development waste rock and sorting tailings are suitable materials for structural backfill.
The New Amalga project adopts a "small footprint" underground mining strategy, where all waste rock and tailings will be backfilled underground, eliminating the need for permanent surface waste disposal facilities. Ore will be transported off-site for third-party processing, eliminating the need for on-site construction of a processing plant and tailings storage facility. This design significantly reduces surface disturbance, lowers reclamation obligations, and simplifies the environmental permitting process. The project currently has proven resources of 1,438,500 ounces of gold at an average grade of 9.47 grams per tonne, and inferred resources of 515,700 ounces of gold at an average grade of 8.85 grams per tonne.
