TORONTO, ON / ACCESS Newswire / June 17, 2026 / Sterling Metals Corp. (TSXV:SAG)(OTCQB:SAGGF) ("Sterling" or the "Company") is pleased to report assay results from the first six holes of it 2026 drilling program at the Soo Copper Project ("Soo Copper" or the "Project") located near Batchewana Bay, Ontario. These results continue to demonstrate the scale and continuity of the Soo Copper system at the MEPS Discovery ("MEPS"), expanding the footprint of copper mineralization, confirming a copper bearing, multi-phase porphyry stock across a 1.4-kilometre corridor (Figure 1), and identifying a new higher grade molybdenum zone at depth.

Highlights

• Broad intervals of near surface mineralization returned:

  • 503.9m of 0.26% CuEq (0.14% Cu, 0.05 g/t Au, 0.64 g/t Ag, 177.4 ppm Mo) from 3.1m depth in SC-26-04;

  • 289.5m of 0.26% CuEq (0.2% Cu, 0.03 g/t Au, 0.97 g/t Ag, 50.9 ppm Mo) from 3.5m depth in SC-26-05; and

  • 214.5m of 0.29% CuEq (0.22% Cu, 0.02 g/t Au, 0.94 g/t Ag, 75.3 ppm Mo) from 3.0m depth in SC-26-06, including 10.5m of 1.01% CuEq (0.41% Cu, 0.07 g/t Au, 2.67 g/t Ag, 1003.8 ppm Mo) from 207.0m depth.

• Extensive copper-molybdenum mineralization highlights the robust mineralization system associated with the underlying porphyry complex.

• The presence of a multi-phase porphyry stock was intersected in two separate locations - beneath MEPS (SC-26-04 and SC-26-05) and approximately 1km east of MEPS (SC-26-01 and SC-26-02) - supporting Sterling's interpretation of a robust copper system.

• The Company has drilled over 12,000m across 22 holes in 2026.

• Watch Mathew Wilson, CEO walk through cross sections and an interactive 3D visualization of today's highlighted drill holes on VRIFY, while discussing the broader potential of the Soo Copper Project and Sterling Metals by clicking here.

Mat Wilson, CEO, commented, "With the launch of VRIFY, investors and stakeholders can follow along with us as we plug assay results into our model, as we look to define extensions and edges at MEPS, and new areas of mineralization. It is rare to come across such a giant copper system with so little drilling and part of the fun - once you have a discovery to grasp onto - is testing new areas while also expanding on the known. With 12km of drilling completed across 22 holes we are just getting started as we expand MEPS and find new zones to dig into across our 8km corridor of outcrop within the 30km copper system."

Jeremy Niemi, SVP Exploration, commented, "In these first six holes, we have intersected a mineralized multiphase porphyry stock below two separate and significant copper prospects, beneath MEPS and approximately one kilometre to the east. This confirms to us that the copper mineral system is very large with the potential of clustered centres of more concentrated copper mineralization at shallow depths, allowing for a rapid succession of more new copper discoveries and future copper resources. At MEPS, the broad continuous copper intervals and high-grade molybdenum-copper beneath are but two parts of what is clearly revealing itself to being a very large porphyry copper-molybdenum system. This comes to surface, is remarkably well-preserved, and will continue to rapidly grow with more exploratory drilling. Follow-up holes are already drilled and we look forward to what the future has in store."

Figure 1. Plan map of 2026 drilling and reported results on holes.

Figure 2. High-grade molybdenite core photo from hole SC-26-04 at 360.3m depth grading 1.7% Mo over 1m length

Figure 3. Copper mineralization above GFP dyke in SC-26-05 at 140.7m depth grading 1.79% CuEq

Figure 4. High-grade copper mineralization grading 2.07% CuEq in hole SC-26-01 at 154.85m depth, located approximately 1km east of the main MEPS discovery

SC-26-01 - Eastern ZTEM Target; Discovery of New Cu-Mo mineralized Porphyry Stock

SC-26-01 was designed to test the large ZTEM resistivity anomaly located approximately one kilometre east of the MEPS Discovery zone. Drilled toward the south-southwest, the hole intersected altered mafic volcanics before entering a felsic porphyry stock complex dominated by coarse-grained granite porphyry, at approximately 637m depth. The upper mafic volcanics host copper mineralization, including distinct higher-grade intervals of semi-massive chalcopyrite and pyrrhotite between approximately 154m and 207m. At depth, the granite porphyry hosts widespread copper-molybdenum mineralization as quartz-molybdenite and quartz-biotite-chalcopyrite stockwork veining associated with pervasive potassic (biotite and feldspar) alteration, with copper sulphides also occurring as pervasive finely disseminated chalcopyrite and lesser bornite within the groundmass. Assays confirm widespread copper-molybdenum mineralization throughout the intrusive section; the porphyry complex remains open at depth beyond one kilometre and along strike to north, east and south.

SC-26-02 - Western Flank Test of Eastern ZTEM Anomaly and Porphyry Stock

SC-26-02 tested the western flank of the eastern ZTEM anomaly to evaluate whether copper grades increase approaching the main intrusive contact. The hole remained within chlorite-magnetite altered mafic volcanics to approximately 634m hole depth before entering the stock, again dominated by granite porphyry. The upper volcanic package hosts pervasive copper mineralization as disseminated chalcopyrite within the groundmass, within local zones of magnetite alteration, and within quartz-sulphide veins. At the main contact with the porphyry stock, mineralization changes to stockwork veining dominated by early biotite and quartz-molybdenite veins with minor disseminated chalcopyrite and trace bornite throughout.

SC-26-03 - ZTEM Continuity / Western Linkage Test

SC-26-03 was drilled to the west to test the continuity of the eastern ZTEM anomaly and to evaluate a possible structural linkage toward the western anomaly. The hole remained entirely within largely chlorite-epidote altered mafic volcanics, intersecting only a narrow GFP-type felsic porphyry dyke between approximately 145m and 152m hole depth. Volcanic-hosted mineralization consists of minor but pervasive pyrite-chalcopyrite with trace bornite that locally intensifies along hydrothermal fracture networks. This strong, pyrite-dominated mineralization with widespread, anomalous copper-molybdenum contents is interpreted to represent a pyritic propylitic shell located outboard of inner copper zone mineralization.

SC-26-04 - MEPS West Extension and ZTEM Target

SC-26-04 tested the western ZTEM anomaly and found that its upper margin coincides with the contact zone of a multi-phase felsic porphyry stock complex. The hole intercepted a cluster of three distinct intermineral porphyry dyke phases before entering a granite porphyry stock at approximately 631m hole depth. The shallower porphyry dyke phases host veins, hydrothermal brecciation and increased presence of chalcopyrite-molybdenite, with local minor presence of bornite-covellite. At approximately 444m hole depth, the hole intercepted a 50m length of hydrothermal quartz-sulphide breccia dominated by molybdenite-chalcopyrite, helping define a high-priority, structural corridor of copper-molybdenum mineralization interpreted to link Cu-Mo mineralization intercepted in holes MJ-25-02 and MEPS-25-02 drilled in 2025. The deeper granite porphyry stock is altered and hosts extensive, minor quartz-molybdenite and quartz-biotite-chalcopyrite stockwork veining.

SC-26-05 - MEPS West Extension and ZTEM Target

SC-26-05 also tested the ZTEM anomaly west of MEPS, adjacent to SC-26-04 and intersected a broadly mineralized mafic volcanic succession hosting generally minor but widespread chalcopyrite, bornite and covellite mineralization. The hole entered the contact zone of the granite porphyry stock complex at approximately 609m hole depth, where it intersected a well-developed hydrothermal quartz-sulphide breccia, containing chalcopyrite and molybdenite, along the upper contact boundary. Below this breccia the granite porphyry hosts pervasive but minor quartz-molybdenite and quartz-biotite-chalcopyrite stockwork veining with potassic alteration.

SC-26-06 - MEPS Near-Surface Extension

SC-26-06 tested the extension of near-surface mineralization at a steeper angle to SC-26-05. The hole remained entirely within mineralized mafic volcanics, intersecting a GFP porphyry dyke between approximately 110m and 124m. Elevated copper grades are associated with increased chalcopyrite-bornite-covellite mineralization developed in the mafic volcanics immediately adjacent to this GFP dyke. Volcanic-hosted mineralization consists of chalcopyrite-molybdenite-bornite-pyrite with associated potassic alteration, that locally intensifies along hydrothermal fractures and vein networks. The hole entered a sub-vertical gabbro dyke, interpreted as a subvolcanic intrusive within the Archean mafic volcanic succession, at approximately 217m hole depth and continued drilling down this unit until the end of the hole. In general, these gabbro units host weaker copper mineralization as compared to the basalts; their more massive, less permeable nature may have hindered hydrothermal fluid flow during the subsequent porphyry copper event.

Exploration Update

Drilling continues at Soo Copper. Sterling is currently drilling the 22nd hole of its 2026 program and has completed approximately 12,000m of a minimum 20,000m campaign. Following completion of follow-up drilling in the core of the MEPS system, the rig is now testing a favourable northeast trend approximately one kilometre northeast of the MEPS Discovery and a recently identified, high-priority target along that corridor. Sterling intends to return to the MEPS area and extend drilling westward towards the zones of mineralization seen in CH-25-01 and R2304 (see Figure 1) and then towards the very large Gimlet target area where in 9 days during last year's field program, 93 copper outcrop samples were found (38 with bornite) within a 3 x 3km area approximately 2km from the MEPS Discovery.

The company has begun making access trails for field work, including detailed prospecting across other areas of Gimlet, as it plans to work its way from the MEPS Discovery zone towards the Gimlet target area. During the trail construction, approximately 1.2 kilometres west of the MEPS Discovery, the Sterling team made a new surface discovery of copper mineralization in outcrop. To date, surface copper mineralization covers an area of approximately 25 metres by 5 metres and consists of quartz-sulphide breccia hosted chalcopyrite and bornite with pyrite hosted in neighboring mafic volcanic rocks - sulphide mineralogy comparable to that observed in surface outcrop at the MEPS Discovery. The showing lies along the same northeast-southwest trending corridor that runs through the MEPS Discovery and farther to the northeast toward the area of current drilling and other regional exploration targets.

Figure 5. New Outcropping Areas of Interest seen in Parallel Structure to MEPS Discovery

Table 1. Significant Assay Intervals