• Tharisa raised about US$294 million from a US$300 million five-year senior secured bond issued at 98% of face value with an 11% coupon
• More than US$240 million has already been invested in Karo
• Karo is designed to produce about 226,000 ounces of platinum group metals annually

Harare - Tharisa Plc has raised approximately US$294 million through a five-year senior secured bond that will be used mainly to complete construction of the Karo Platinum Project in Zimbabwe, giving the miner a substantially larger funding base ahead of first production targeted for the final quarter of 2027.

The US$300 million bond was issued at 98% of face value and carries an 11% semi-annual coupon. The discount means investors paid about US$294 million for securities that redeem at US$300 million, lifting the effective return above the headline coupon. On a standard five-year semi-annual yield calculation, the pricing equates to roughly 11.5% nominal annualised yield to maturity, or about 11.9% on an effective annual basis, assuming repayment at par and no default.

The financing arrives after Karo secured several pieces of the project structure in quick succession. On 24 August, the project received a 25-year Special Mining Lease covering 23,903 hectares on Zimbabwe’s Great Dyke. Three days later, Tharisa announced a five-year agreement under which Karo’s platinum group metal concentrate will be purchased by Valterra Platinum. Tharisa then approached fixed-income investors on 2 September for a US$300 million senior secured bond through its wholly owned financing subsidiary, Arxo Finance Plc. 

The frequirement had been visible for some time. Tharisa disclosed in its March 2025 interim results that it had experienced difficulty securing Karo funding because lenders were considering both the project’s high capital requirement and Zimbabwe jurisdiction concerns. At that stage, capital expenditure since development began stood at US$154.8 million, and the company said alternative financing solutions were being explored. 

Investment has since moved above US$240 million, while the revised project requirement is around US$545 million. The US$294 million cash proceeds from the latest bond therefore sit close to the residual funding requirement after capital already deployed, although the official bond announcement allows part of the proceeds to be used for general corporate purposes as well as Karo capital expenditure. 

The bond consequently changes the immediate Karo discussion from access to capital toward construction execution and debt service. Karo has a 2.1 million ounce open-pit reserve and an 11.2 million ounce mineral resource, with Phase 1 designed to produce approximately 226,000 ounces of platinum group metals each year. Tharisa produced 138,300 ounces from its South African operations during the 2025 financial year, meaning Karo at design output would materially expand the group’s platinum group metal production base. 

The cost of the new funding is equally important. An 11% coupon creates approximately US$33 million of annual cash interest on US$300 million of principal before fees and any additional borrowing costs. Over five years, the contractual coupon alone amounts to around US$165 million if the bond remains outstanding for the full term, followed by repayment of US$300 million principal at maturity.

The issuance price adds another US$6 million of economic financing cost through the discount to par. Investors therefore receive compensation for construction exposure, platinum group metal price volatility and Zimbabwe jurisdiction risk at a time when Karo has no operating cash flow of its own.

That pricing can be viewed against Tharisa’s existing balance sheet. The group reported US$54 million of net cash at March 2026 and continued to generate cash from its established South African chrome and platinum group metal operations, while investing US$21.4 million into Karo during the first half of the financial year.  The bond shifts a larger portion of Karo’s remaining development requirement away from internally generated cash and onto fixed-term debt.

That preserves group liquidity for the South African business, where Tharisa is also financing a substantial transition toward underground mining. The company committed around US$547 million over ten years to that programme, creating competing calls on group capital before Karo becomes cash generative. 

The bond market’s willingness to absorb the Karo financing is therefore important, although the coupon shows that investor demand came with a significant return requirement. The transaction was oversubscribed and attracted institutions across Europe, the United Kingdom, the Middle East, North America and Asia, broadening Tharisa’s funding pool beyond the southern African banking and capital markets.

Karo had previously used Zimbabwe’s Victoria Falls Stock Exchange to raise project debt. Karo Mining Holdings issued approximately US$36.8 million of three-year notes in December 2022, including US$26.8 million to external investors and US$10 million to Arxo Finance. Those securities were later proposed for extension to December 2028 with the coupon increasing from 9.5% to 11%. 

The difference in scale is substantial. The new international bond is around eight times the size of that earlier issue, showing how quickly the funding requirement of a major mine can exceed the depth available from Zimbabwe’s domestic United States dollar capital market.

Karo’s projected operating economics now become more important because the project must support that debt after commissioning. An independent competent person’s report published in 2025 used a long-term realised six-element platinum group metal basket price of approximately US$1,203 per ounce and calculated a break-even price including capital of about US$1,213 per ounce. The report therefore placed the base-case valuation close to the project’s full-cost break-even point under the price assumptions used at the time. 

That report preceded the final bond pricing and the latest development schedule, so its economics cannot simply be carried forward unchanged. It does, however, provide an important benchmark for evaluating Karo’s exposure to commodity prices. A mine carrying a material fixed-dollar interest bill has less tolerance for prolonged periods of weak platinum group metal pricing during ramp-up.

Tharisa’s established South African operation offers some context. Its 2025 average platinum group metal basket price was US$1,615 per ounce, while the reported all-in cost per six-element ounce sold was approximately US$571 after taking the chrome co-product economics into account.  Karo does not have the same chrome co-product structure, meaning its standalone margin profile has to be assessed on its own mine plan, recoveries, grades and concentrate terms.

The Valterra Platinum purchase agreement addresses part of that commercial chain by giving Karo a defined buyer for concentrate. The mining lease addresses tenure. The bond addresses much of the remaining development funding. These steps narrow the number of unresolved project variables before first ore, leaving construction completion, commissioning, operating performance and commodity prices increasingly prominent.

The Special Mining Lease also fixes the government’s participation at project level. Karo Platinum is held 85% by Karo Mining Holdings and 15% by Generation Minerals, the Government of Zimbabwe vehicle, on a free-carry basis. Tharisa owned 78.17% of Karo Mining Holdings at September 2025, giving it an effective interest of roughly 66.4% in Karo Platinum. 

The fiscal regime remains important to project returns. The 2025 competent person’s report modelled specific assumptions around royalties and taxes and warned that some concessions assumed in its valuation were not supported by a written agreement at the time. It estimated that losing those assumptions could add around US$36 million in tax and US$64 million in royalties over the life of mine.  The subsequent 25-year Special Mining Lease materially advances the project’s regulatory position, although the detailed fiscal package should be assessed against the final executed agreements rather than earlier modelling assumptions.

The bond’s senior secured status also matters, although the public Tharisa announcement currently provides limited detail on the precise collateral package, maintenance covenants and refinancing restrictions. It confirms a five-year senior secured instrument issued by Arxo Finance and specifies Karo capital expenditure and general corporate purposes as uses of proceeds. Full assessment of creditor protections requires the final bond documentation. 

The five-year maturity creates another measurable point. Karo is targeting first production in the final quarter of 2027, leaving roughly four years between planned first output and the bond’s maturity. That period has to accommodate commissioning, ramp-up, operating cash generation and a refinancing or repayment strategy.

The economic value of the financing can therefore be assessed through a clear sequence. Construction needs to convert the US$294 million raised into an operating mine, the concentrator has to ramp toward design capacity, annual production has to progress toward 226,000 ounces, and cash generation has to cover operating expenditure, sustaining capital and approximately US$33 million of annual bond interest.

Karo has now secured mining tenure, a concentrate buyer and the largest financing package in the project’s development history. The 11% coupon provides an equally important piece of information for investors and Zimbabwe’s mining sector: international capital is available for a large greenfield Zimbabwean mine, and the market has placed a double-digit dollar price on carrying that project through its remaining construction phase.

Equity Axis News