Sterling Metals Announces High-Grade Copper Discovery at the Soo Copper Project Intersecting 262.5m of 1.05% CuEq, Including 68.3m of 3.25% CuEq and 9.3m of 19.8% CuEq from Near Surface

Executive Summary
- Sterling Metals announced a major discovery in drill hole MEPS‑25‑02, intersecting 262.5 m of 1.05 % CuEq, including a 68.3 m high‑grade zone averaging 3.25 % CuEq and ultra‑high grades of up to 33 % Cu and 196 g/t Au over short intervals.
- The results represent the highest copper and gold grades ever recorded at the Soo Copper Project, indicating a large‑scale Cu‑Au‑Ag‑Mo porphyry system with significant upside potential.
- Phase 2 drilling program has been expanded to a minimum of 6,000 m (up from 3,000 m) to further delineate the discovery; a live webinar will be held on October 1, 2025.
Key Details
- Hole MEPS‑25‑02: Total depth 597 m; core interval 5–341 m (336 m).
- Overall intercept: 262.5 m @ 1.05 % CuEq (47.5 m to 310 m downhole).
- High‑grade zone: 68.28 m @ 3.25 % CuEq (179.72 m to 248.0 m), with peak values of 9.30 % CuEq over 19.98 % CuEq in a 1.39 m sub‑interval.
- Ultra‑high copper: 33 % Cu over 0.55 m starting at 220.45 m depth.
- Ultra‑high gold: 196 g/t Au and 21.3 % Cu over 0.6 m starting at 219.85 m; also 0.342 g/t Au with 33 % Cu over 0.55 m.
- Additional notable intervals:
- 13.3 % Cu, 1.03 g/t Au, 22.9 g/t Ag over 0.4 m (181.25–181.65 m).
- 6.80 % Cu, 13.20 g/t Au, 46.26 g/t Ag over 9.15 m (215.6–224.75 m).
- Assay methodology: Samples processed by Actlabs (ISO‑17025/9001 accredited); QA/QC protocols included blanks, duplicates, and certified reference materials for both ICP metal analysis and fire‑assay gold determination.
- Geological context: High‑grade bornite‑rich mineralization associated with the GFP porphyry dykes identified in Phase 1; no pyrite or pyrrhotite observed in the reported intervals, indicating a clean sulfide system.
- Phase 2 program expansion: Minimum drill length increased from 3,000 m to at least 6,000 m to further test the newly defined high‑grade target area.
- Webinar: Live presentation scheduled for Wednesday, October 1, 2025 at 11:00 a.m. ET; registration link provided in release.
Notable Quotes
“By integrating surface geology, resistivity data, and insights from our Phase 1 drilling, we refined our targeting model and were able to adjust in real time. MEPS‑25‑02 immediately delivered bornite from near surface and went on to produce the highest copper and gold grades drilled to date.” – Jeremy Niemi, SVP Exploration & Evaluation
“This discovery clearly indicates the potential for a giant magmatic hydrothermal (‘porphyry’) Cu‑Au‑Mo deposit within the Batchewana peninsula… we have just begun to tap.” – Dr. Neil O’Brien, Technical Advisor
“The decision to drill MEPS‑25‑02 was not part of the original plan, but the team recognized the opportunity and had the conviction to act on it… positions Sterling to continue unlocking discoveries of this caliber.” – Mathew Wilson, CEO & Director