Onyx Gold Corp. is an explorer spun out of HighGold Mining in June  2023 via a court‑approved plan of arrangement; every four HighGold shares yielded one Onyx share, transferring HighGold’s Canadian exploration subsidiaries into the new vehicle. The company is led by President & CEO Brock Colterjohn and is backed by a mix of institutions and three producing gold miners, with a cash balance of roughly C$13 million after a mid‑2025 equity financing that carried no warrants.

Its flagship asset is the 109 km² Munro‑Croesus project, 75 km east of Timmins, Ontario. The property gives Onyx control of about eight kilometres of the Pipestone Fault and the contiguous Croesus Flow basalt that once hosted the historic Croesus Mine. Drilling in April and June  2025 delivered headline intercepts of 69.6 m @ 3.4 g/t Au (hole MC24‑163) and 91.0 m @ 1.8 g/t Au (hole MC25‑168) at the new Argus North shear zone, demonstrating vertical continuity over roughly 100 m while remaining open in all directions. A fully funded 10,000 m Phase‑1 program (two rigs) is under way to tighten spacing, test strike extensions, and probe additional splays and basalt‑hosted targets across the enlarged claim block.

Beyond Timmins, Onyx holds four early‑stage properties (King Tut, Divide, News, West Denali) in Yukon’s Tombstone Gold Belt. Initial mapping, soil geochemistry, and scout drilling at King Tut have outlined kilometre‑scale gold‑in‑soil anomalies associated with reduced intrusions—an analogue to nearby discoveries such as Snowline Gold’s Rogue project. These northern projects remain secondary but provide blue‑sky optionality and a pipeline of targets for future drilling once the company has firmed up its Ontario discovery.

In this interview, Onyx Gold CEO Brock Colterjohn is put on the BBQ about the company’s structure, strategy, and hopes.

5 Takeaways From Our Onyx Gold CEO Interview

1. High‑Grade Discovery at Argus North
   Onyx has intercepted 69.6 m @ 3.4 g/t Au (incl. 34.5 m @ 5.4 g/t) and 91 m @ 1.8 g/t in the first two fences, demonstrating ~100 m of vertical continuity in a steep shear splay off the Pipestone Fault. Two rigs are midway through a 10,000 m Phase‑1 program, stepping 50 m along strike and up‑dip to surface while infill assays from 13 additional holes are pending, each designed to show the zone can grow into a mine‑scale panel rather than a one‑hole wonder.
2. Financial Position
   A C$13 million bought‑deal/strategic placement closed in June  2025, pushing the treasury to roughly C$15 million and leaving no warrants overhanging the market. Fully diluted share count rises only ~10 % if the 4 million in‑the‑money options and 2 million RSUs vest, giving the company enough runway to finish Phase‑1, fund baseline studies, and enter 2026 without another raise.
3. Team
   CEO Brock Colterjohn and Executive Chairman Darwin Green previously advanced the Long Canyon discovery that Newmont bought for US$2.3 billion, while VP Exploration Tyson King cut his teeth in the Timmins camp. The board includes ex‑Agnico and Equinox technical talent and a CFO who steered two juniors through acquisition exits, aligning capital‑markets experience with discovery expertise.
4. Projects
   Munro‑Croesus sits 75 km by paved highway from Timmins, allowing <C$215/m all‑in drilling versus +C$300/m in bush camps. Existing exploration permits cover drilling, trenching, and minor ground disturbance; no new EA triggers arise until advanced bulk sampling. Year‑round access, grid power within 10 km, and nearby toll mills compress future capex and timeline risk.
5. Yukon
   The four Tombstone‑belt properties (King Tut, Divide, News, West Denali) total 227 km² with intrusion‑related gold signatures similar to Snowline’s early hits. While management is laser‑focused on Timmins, they’ve signalled openness to spinning the northern portfolio into a new vehicle or farming it out, which are options that could crystallise hidden value without draining cash from the flagship program.

Onyx Gold CEO Interview With Brock Colterjohn

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