Update on GPS Drilling Programs

Great Plains Metals Corp. (GPS) released a geological update on July 14, 2026, covering its Goodrich porphyry Cu-Au project in New South Wales and the Everton project in Victoria. At Goodrich, diamond hole GGDD004 intersected a chalcopyrite-bearing cupola with underground stoping targets (USTs) at 81 meters, extending to visible disseminated chalcopyrite in altered monzonite porphyry to a depth of 218 meters. While alteration zones including regolith, inner propylitic, mineralized porphyry, and propylitic areas were mapped, no assay grades were provided, with the company expecting results this month. Additionally, a review of 25-year-old historical core from Malachite Resources identified previously unassayed altered intervals, resulting in 324 samples being submitted for assay. GPS also commenced Stage 2 of the Godolphin earn-in, requiring a spend of A$1 million and drilling of 500 meters to increase its stake from 51% to 70%.

At the Everton project, five diamond holes totaling 678 meters tested a porphyry Mo-Cu target. The first two holes returned only 100–2,000 ppm Mo and Cu (0.01–0.2%), figures significantly below historical mined grades of 1.4% Mo. Consequently, the company will cease exploration at Everton.

Great Plains Metals Corp. (GPS) released information regarding its Everton project, marking the abandonment of a site previously characterized as a pencil porphyry target. While this development is negative, Everton was considered a secondary asset, with market attention centered on the Goodrich project.

The update regarding Goodrich is deemed non-material until assay results are available. The stock traded at $0.16 prior to the release, having declined from $0.28 in January, a trend that suggests the market had already priced in earlier delays in assay timelines. The current announcement contains no numerical data and does not change the underlying deposit thesis.

Great Plains Metals Corp. (GPS) is a Canadian junior explorer focused on porphyry copper-gold and molybdenum projects in Australia. The company holds a 51% stake in the Yeoval Goodrich project in New South Wales, which is moving to a 70% interest, and 100% of the abandoned Everton project. It also maintains a 37% stake in Eversley Resources, which holds North Gawler IOCG/REE assets.

In February 2026, the company completed a $4.18M placement at $0.18 per unit, providing working capital. Great Plains Metals currently has no mineral resources or reserves. Prior-period context indicates no revenue and typical cash burn.