By Charles Pitts
Capricorn Metals (ASX: CMM) has announced a significant 33% increase in its group ore reserves, reaching 5.24 million ounces, underpinned by a transformative update to the Mt Gibson Gold Project (MGGP) in Western Australia. The mid-2026 report marks a major milestone for the mid-tier producer, effectively shifting its production trajectory toward a medium-term goal of over 400,000 ounces of gold per annum.
The updated figures follow a comprehensive Pre-Feasibility Study (PFS) for the Mt Gibson project, which now incorporates an underground mining component for the first time. This expansion not only extends the mine life at Mt Gibson to 19 years but also establishes the project as one of the premier mining development stories in the Asia-Pacific mining news sector this year.
Mt Gibson PFS: A 19-Year Production Powerhouse
The 2026 PFS for Mt Gibson has fundamentally altered the project’s scale. Previous estimates suggested a high-margin open-pit operation producing approximately 155,000 to 180,000 ounces per year. The new study, however, outlines a steady-state production profile of 260,000 ounces per year.
A critical driver of this growth is the maiden underground ore reserve. By integrating the underground resource: previously reported at 684,000 ounces at 3.1 g/t: Capricorn has successfully converted a significant portion of its inventory into a bankable mining plan. The combined open-pit and underground operations are expected to maintain an all-in sustaining cost (AISC) of approximately A$1,870 per ounce over the nearly two-decade life of the mine.
“The Mt Gibson update is a step-change for the company,” the report noted, highlighting that the project remains on track for development pending final state environmental approvals. Capricorn has already received Commonwealth environmental clearance, allowing for early procurement and design work to reach 98% completion.
Group Reserves and Resource Expansion
Beyond Mt Gibson, the group’s total mineral resource estimate has risen by 29% to 8.66 million ounces, up from the 8.1 million ounces reported at the end of 2025. This growth reflects aggressive exploration and successful reserve conversion at both Mt Gibson and the company’s flagship Karlawinda Gold Project (KGP).
The 33% uplift in group ore reserves: from 4.0 million ounces to 5.24 million ounces: positions Capricorn as a significant player in the global gold landscape. Investors and analysts focusing on gold mining news 2026 have noted that this reserve growth provides the necessary “critical mass” for Capricorn to transition from a single-asset producer to a multi-mine gold major.
Comparison of 2025 vs. 2026 Gold Inventory
| Metric | June 2025 | June 2026 | Change (%) |
|---|---|---|---|
| Group Ore Reserves | 4.00 Moz | 5.24 Moz | +33% |
| Group Mineral Resources | 8.10 Moz | 8.66 Moz | +29% |
| Mt Gibson Mine Life | 17 Years | 19 Years | +12% |
| Mt Gibson Annual Output | ~155 koz | 260 koz | +67% |
Karlawinda Performance and Expansion
While Mt Gibson dominates the headlines, the Karlawinda Gold Project continues to provide the financial foundation for the group’s growth. In the 2026 financial year, Karlawinda produced 123,589 ounces of gold, hitting the top end of its guidance range of 115,000 to 125,000 ounces.
The Karlawinda Expansion Project (KEP) is currently in the commissioning stage. This expansion is designed to increase processing capacity to 6.5 million tonnes per annum (Mtpa). Throughout 2026, the company successfully managed the installation of a new ball mill and completed over 70% of the plant site concrete work, all while maintaining an AISC within the guided range of A$1,530 to A$1,630 per ounce.
The operational efficiency at Karlawinda has allowed Capricorn to build a robust cash position. As of the June 2026 quarter, the company reported A$507 million in cash and gold on hand. This “war chest” is expected to fund the upcoming development at Mt Gibson without the immediate need for significant external equity raises, a point of strength in the current gold mining news 2026 cycle.
Strategic Outlook: The “Range 500” Aspiration
With the Mt Gibson PFS confirming a larger production profile, Capricorn has articulated a medium-term group production target exceeding 400,000 ounces per year. This is expected to be achieved within roughly 30 months of the commencement of construction at Mt Gibson.
Furthermore, management has introduced the “Range 500” aspiration: a long-term goal to reach 500,000 ounces of gold production per annum. Achieving this would require further project optimization, successful underground exploration at Karlawinda, and continued resource-to-reserve conversion at Mt Gibson.
The move toward underground mining at Mt Gibson is particularly noteworthy for the Australian gold sector. It signals a broader industry trend where companies are looking deeper to find the gold reserves required to sustain decade-long production targets. By proving the viability of underground mining at Mt Gibson, Capricorn has effectively de-risked the future “Range 500” strategy.
Market Implications for Investors and Operators
For mining professionals and investors, the 33% reserve increase highlights Capricorn’s ability to execute on its technical and developmental promises. In a gold market characterized by rising costs and permitting delays, the company’s progress in Western Australia serves as a benchmark for mining development.
The focus now shifts to the final permitting stage for Mt Gibson. Given that the process plant design is nearly 100% complete and preferred mining contractors like MACA are already engaged for early works, the transition from “permitted” to “pouring gold” could be faster than many industry peers.
As the energy transition continues to drive demand for critical minerals, the gold sector remains a vital hedge and a source of liquidity for the broader mining industry. Capricorn Metals’ latest update ensures that it remains at the forefront of the Australian gold narrative for the remainder of 2026 and beyond.
