Sterling Metals Summer Field Program Discovers Bornite in Outcrop Across a 6km Corridor and Appoints Dr. Neil O'Brien as Chief Geologist

TORONTO, ON / ACCESS Newswire / October 8, 2025 / Sterling Metals Corp. (TSXV:SAG)(OTCQB:SAGGF) ("Sterling" or the "Company") is pleased to announce the discovery of large-scale bornite in outcrop and the appointment of Dr. Neil O'Brien as Chief Geologist. Concurrent with its ongoing drill program, regional exploration has expanded the surface footprint of copper mineralization at the Company's Soo Copper Project, located near Sault Ste. Marie, Ontario.

Surface mapping and sampling have identified extensive chalcopyrite and bornite mineralization extending south of the current drill area, defining a new target corridor known as the Gimlet Target Area. This discovery represents a major step in delineating the broader copper system surrounding the high-grade mineralization intersected in recent drilling. Bornite in outcrop has been a key factor in establishing priority targets such as the cave showing, leading to drill hole MEPS-25-02, which intersected 262.5m @ 1.05% CuEq, including 68.3m @ 3.25% CuEq and 9.3m @ 19.98% CuEq, as announced in a press release dated September 29, 2025.

Highlights of the Summer Field Program

• An expanded regional soil sampling program including 1,323 new soil samples uncovered 122 new copper samples across a corridor of interest now exceeding 6km (Sample assays pending).

• At the Gimlet Target Area, 93 copper-bearing samples including 38 containing bornite were collected across a 2km area, marking the largest concentration of bornite in outcrop discovered to date. This zone lies more than 2km from the MEPS-25-02 drill hole collar. Limited historical drilling in the area recorded porphyry-style alteration and copper sulphides.

• Reprocessing of a 2014 ZTEM survey has revealed a 10km circular anomaly encompassing both the 2025 drilling and the Gimlet Target Area, interpreted as a potential intrusive centre linked to copper mineralization (Figure 1).

Foto: Accesswire

Figure 1. Soo Copper Project, surface sample locations over copper in soils map, over regional ZTEM survey (resistivity) and Lidar.

Appointment of Dr. Neil O'Brien as Chief Geologist
Dr. O'Brien has served as Technical Advisor to the Company since January 2023 and was instrumental in guiding Sterling's recent high-grade copper discovery at the Soo Copper Project in Ontario's Mid-Continent Rift.

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