Announcement • Jul 17

Great Plains Metals Corp. provides Update on GPS Drilling Programs

Great Plains Metals Corp. announced an update on the drill programs at the Goodrich porphyry copper-gold project in the Lachlan Fold Belt. Highlights: Goodrich Drilling Summary; Alteration & Mineralization Highlights: Drill Hole GGDD004; Geological Context; Review of Historical Drill Core at Goodrich; Stage 2 Earn-in Commenced to Reach 70% Ownership. The Company announced on 4 May 2026 the completion of an extensive shallow Air Core program of 2,065 meters around the former Goodrich mine and historic Mt Rose workings. All holes reached bedrock defining several coincident bedrock gold-copper-molybdenum (Au-Cu-Mo) anomalies for follow up investigation. Following the Air Core program, four diamond drill holes were completed for a total of 1020 meters (three at Goodrich and one at Mt Rose). The second hole collared adjacent to the Goodrich open cut, GGDD004, was particularly notable as it intersected a chalcopyrite-bearing cupola, with unidirectional solidification textures (USTs) at 81 meters and visible varying amounts of disseminated chalcopyrite (a copper mineral) in white-mica-albite altered monzonite porphyry to a depth of 218 meters. These are classic signatures of a porphyry copper-gold system. Follow-up drilling is being actively planned to delineate the extent and potential of the mineralization discovered in the Phase One drilling. Detailed core logging from drill hole GGDD004 has defined a classic, well-zoned porphyry copper system with distinct downhole alteration and mineralization profiles: 0 - 8.0 meters (Regolith Zone): Near-surface oxidized zone characterized by intense limonitic weathering and pervasive clay-group alteration. 8.0 - 81.8 meters (Inner Propylitic Halo): Grey-white granodiorite wallrock crosscut by multi-generation, salmon-pink albite vein selvedges and thin quartz- carbonate-epidote veins. Notably, a dense quartz-carbonate vein cluster at 66.5 meters hosts trace bornite mineralization. 81.8 - 240.0 meters (Mineralized Porphyry): Located immediately beneath a prominent UST chalcopyrite-quartz layer. This extensive interval consists of a crowded monzonite porphyry hosting widespread disseminated chalcopyrite. Mineralization is directly associated with strongly developed, overlapping assemblages of pink-orange albite and white-grey phyllic (white mica) alteration. 240.0 - 297.5 meters (Inner Propylitic Zone): Patchy sulfide mineralization transitioning structurally into peripheral, late-stage chloritic-, epidotic-, and carbonate-dominant assemblages near the base of the hole. The primary monzonite porphyry body is punctuated by an intermediate granodiorite intrusive phase and localized post mineral trachytic dykes, highlighting a complex, multi- phase magmatic system. Porphyry copper-gold mineralization has been recognized in the Yeoval-Goodrich district since the 1970's. Despite this, there has been only limited exploration with shallow drilling campaigns targeting geochemical and geophysical anomalies. The geological setting of the disseminated porphyry copper-gold mineralization is not well understood and the recent recognition of monzonitic cupola textures at the former Goodrich mine highlight the potential for "pencil" porphyry targets. It is not known at this stage whether the copper and gold mineralization intersected in GGDD004 is a southern extension of the high- grade ore previously mined at Goodrich, or another mineralized porphyry stock, as such deposits often occur as clusters. A Phase Two drilling program is scheduled to commence in August. The Company expects to receive all the assay results this month and will provide an update in due course. A review of drill core from exploration undertaken by Malachite Resources at Goodrich 25 years ago was conducted at the New South Wales Mines Department storage facility at Londonderry. Recent logging of this core showed that significant altered and potentially mineralized intervals were surprisingly not assayed, and a total of 324 samples have been submitted for assay.

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