Perseus’s 40% Reserve Jump Raises the Bar for Nyanzaga’s January Start

Perseus Mining has turned a year of strong gold prices into a much larger production runway, lifting group proved and probable reserves 40% to 7.0 million ounces while also increasing shareholder returns and keeping its biggest growth project, Nyanzaga in Tanzania, on schedule for first gold in January 2027.

The August 26 reserve update is more than an inventory exercise. Measured and indicated resources rose 37% to 10.6 million ounces, while reserves increased by about 2.0 million ounces from the June 2025 base. The biggest contribution came from Nyanzaga, where reserves are now 4.1 million ounces, up roughly 1.77 million ounces from the level reported a year ago. Yaouré reserves also increased 15% to 1.66 million ounces, and Edikan’s measured and indicated resource rose 54% to about 2.53 million ounces.

That changes the shape of Perseus’s portfolio. Nyanzaga now represents close to three-fifths of group reserves, making execution at the Tanzanian development increasingly important to the company’s long-term production profile. The project is 80% owned by Perseus, with the Tanzanian government holding the balance.

The latest Nyanzaga reserve stands at 95.7 million tonnes grading about 1.34 grams per tonne for 4.11 million ounces. That is a material step beyond the 4.05 million-ounce reserve Perseus reported in February and far above the 2.3 million ounces underpinning the April 2025 feasibility study. The February update extended the planned mine life to 16 years, including 14 years above 200,000 ounces a year.

The larger reserve also raises the standard against which the build will be judged. Perseus committed about US$523 million to develop Nyanzaga under the 2025 feasibility plan. Construction was 48% complete at the end of March and had progressed further by the June quarter, with pre-stripping, mill installation, carbon-in-leach tanks, tailings infrastructure and camp works advancing. Management continues to target first gold in January 2027.

The economics are attractive on paper, but the reserve growth creates a sequencing question. The original 2025 feasibility case used an 11-year mine life, average annual production above 200,000 ounces from FY28 to FY35 and life-of-mine AISC of about US$1,211 an ounce. The expanded reserve supports a much longer operating horizon, but it also increases the importance of mine scheduling, strip ratios and capital discipline as the pit grows.

Perseus has room to absorb that risk. FY26 operating cash flow rose 24% to US$666.4 million, revenue increased 19% to US$1.48 billion and profit after tax reached US$480.5 million. Cash and bullion ended the year at about US$1.03 billion, with a further US$400 million undrawn debt facility. The company produced about 405,000 ounces in FY26 and stayed within its production and cost guidance.

The balance sheet is now doing two jobs at once. Perseus declared a 9 Australian cent final dividend, taking the full-year payout to 14 cents, up 87%, and completed about A$126 million of buybacks during FY26. The board also expanded the buyback authorization to as much as A$350 million and is considering a further A$100 million distribution linked to proceeds from the Meyas Sand sale in Sudan.

That capital-return policy matters because Nyanzaga is no longer a side project. It is becoming the reserve centre of gravity for the company. Perseus can currently fund construction and returns without debt, but the real test is whether Nyanzaga converts its enlarged geological inventory into low-cost production without absorbing the cash now being returned to shareholders.

There are operating risks elsewhere in the portfolio as well. Yaouré and Edikan both moved through lower-grade or higher-waste mining phases during FY26, which pushed costs higher even as gold prices expanded margins. At the same time, first stoping from the CMA underground at Yaouré adds another source of higher-grade feed and optionality around mine life.

The reserve update therefore sharpens rather than resolves the investment case. Perseus has more gold in the ground, more cash on the balance sheet and a clearer shareholder-return framework. What investors need next is evidence that Nyanzaga’s larger pit can be built and ramped on the promised timetable while group costs remain controlled.

The next catalyst is operational rather than geological: construction progress through the second half of 2026 and the January 2027 first-gold target. If Perseus meets that date while preserving balance-sheet strength, the 40% reserve increase will start to look like a production growth story rather than simply a bigger resource statement.