Canadian mining company Boron One Holdings has raised the projected economic value of its Piskanja boron project in southern Serbia to approximately €569 million. The company’s forecast also cites an after-tax 89% internal rate of return on initial capital expenditure of about €71 million. The update comes as European manufacturers seek alternative supplies of critical industrial minerals.
The updated preliminary economic assessment was published on October 14. It places the project’s after-tax net present value at approximately €569 million using an 8% discount rate. The model also forecasts initial capital recovery within 12 months of commercial production.
The assessment supports the potential investment case for an underground mining and processing operation near Raška, but it remains at a preliminary development stage. Technical, environmental, permitting and financing requirements are still described as outstanding. The revised study also reduces the expected operating life from 16 years to 13 years, while average annual operating earnings are reported to have declined.
Piskanja returns, revenue and capital requirements in preliminary model
Boron One’s updated assessment estimates average annual gross revenue of approximately €125 million. Total revenue over the proposed operating period is estimated at around €1.75 billion. Average annual earnings before interest, taxes, depreciation and amortisation are projected at about €78 million.
The company projects cumulative after-tax project cash flow before financing of more than €1.03 billion. Initial capital expenditure, including contingency, remains approximately €71 million, with a further €34 million in sustaining capital over the operating life. The financial model assumes a construction period of roughly 24 months.
The assessment cites an internal rate of return of 89%, described as unusually high by conventional mining-investment standards. Boron One also notes that a preliminary economic assessment is intended to test potential economic viability rather than confirm that modeled cash flows can be achieved. The company states its capital and operating cost estimates have a preliminary accuracy range of approximately ±35%.
The uncertainty is presented as significant for a project involving underground excavation, mineral processing, infrastructure construction and future chemical production. As a result, the current work is framed as a basis for further development rather than an investment decision supported by final engineering and binding construction costs.
Resource estimate and underground mining plan for 13-year operation
The updated study incorporates revised geological modelling, metallurgical testing, geotechnical investigations and changes to assumptions about the planned mining sequence. Boron One says it has also refined its understanding of how different borate minerals are distributed within the deposit.
The revised mineral resource estimate identifies approximately 7.14 million tonnes of measured and indicated resources. The grade is reported as an average of 32.4% boron trioxide, equivalent to about 2.31 million tonnes of contained boron trioxide. The resources include deposits containing colemanite, ulexite and mixed borate minerals.
Boron One states these resources have not been converted into declared mineral reserves. It also says commercial extraction has not been demonstrated through a completed feasibility study. The revised project plan envisages an average annual underground mining rate of approximately 433,000 tonnes, producing commercial mineral products for 13 years.
The reduced operating life is described as concentrating expected cash generation into a shorter period. Boron One notes this can support attractive discounted returns but leaves less time to recover from construction delays, production interruptions or sustained periods of weaker commodity prices. It adds that further exploration could strengthen long-term production, but additional resources cannot be assumed in the current investment case.
Piskanja product slate: concentrates and later-stage boric acid
Piskanja’s commercial strategy includes processing beyond extraction and export of unprocessed minerals. The development plan includes facilities intended to produce saleable colemanite and ulexite concentrates, alongside downstream production of boric acid. The preliminary assessment targets average annual production of approximately 157,600 tonnes of colemanite, 83,800 tonnes of ulexite, and later-stage output of about 25,000 tonnes of boric acid.
The company links colemanite and ulexite to use in glass, ceramics, chemicals and other industrial applications. It describes boric acid as enabling access to specialised chemical manufacturing and higher-value downstream markets. In the financial model, sales prices are assumed at about €579 per tonne for commercial-grade colemanite and ulexite and about €890 per tonne for technical-grade boric acid.
Boron One characterises these pricing points as modeling assumptions rather than guaranteed future selling prices. It also says domestic processing could generate greater industrial value than exporting raw minerals alone. The economic outcome is stated to depend on achieving planned recovery rates, maintaining product quality and operating processing facilities at competitive costs.
The proposed boric acid operation is described as requiring more complex chemical processing than conventional beneficiation, including acid leaching, crystallisation, separation and product purification. The published initial capital breakdown does not identify a separate allocation for the boric acid plant planned for later development. Future feasibility work is expected to clarify timing, cost and financing needs for this processing stage.
Southeast Europe supply diversification and EU critical mineral context
Boron One positions Piskanja’s location in Serbia as relevant to European industrial customers seeking diversified supplies of critical raw materials. The European Union classifies boron and borates as critical raw materials due to their industrial importance and concentrated international supply. Türkiye is identified as the dominant supplier of borates to the European market.
The source demand is described across glass manufacturing, ceramics, agriculture, advanced materials and specialised industrial applications. Boron is also cited as relevant to selected technologies supporting renewable energy, electronics and advanced manufacturing. Boron One says developing another source of commercial boron products in Southeast Europe could support supply diversification and shorten transport routes for some customers.
The company also notes that strategic importance does not guarantee commercial competitiveness. It states European manufacturers will assess alternative suppliers based on product specifications, delivery reliability, contract prices, sustainability performance and long-term production stability. Piskanja would need to demonstrate consistent performance while competing with established international producers with larger operating networks.
May 2026 binding off-take terms cover minimum purchases from start-up
Boron One says it has secured an initial binding commercial off-take agreement covering future boron products. The agreement was announced in May 2026 and provides for minimum annual purchases of 25,000 tonnes, with an option to increase volumes to 50,000 tonnes. It has an initial three-year term beginning when commercial production starts.
The agreement includes take-or-pay provisions and a contractual price floor intended to reduce some uncertainty around future sales. Boron One states commitments remain subject to conditions including required regulatory approvals and successful qualification of production facilities. The buyer has not been publicly identified and the minimum price has not been disclosed.
Boron One also says the committed minimum volume represents less than one-tenth of the project’s projected combined annual commercial product output. For project-finance lenders, it highlights customer creditworthiness, contract duration, pricing mechanisms and enforceability as key factors. It adds that additional long-term contracts could strengthen financing prospects if they cover a meaningful share of projected output.
Sensitivity on concentrate prices; environmental study completed in November 2025
The updated assessment includes sensitivity calculations showing how changes in revenues and product prices affect project value. Under the base case scenario, after-tax net present value is approximately €569 million. A scenario with a 20% reduction in assumed concentrate prices lowers calculated value to approximately €404 million, holding other variables constant.
Boron One states the project would retain a positive preliminary valuation under that scenario while emphasizing the importance of future selling prices. It also notes that maintaining planned underground production rates and processing performance affects economics because boron markets are less transparent than exchange-traded metals. It points to the role of realized market prices, product qualification and binding sales contracts for investors.
Balkan Gold holds the exploration licence for Piskanja as Boron One’s Serbian subsidiary. Boron One commissioned the Mining Institute in Belgrade to prepare an environmental impact study with documentation completed in November 2025. The study addresses environmental monitoring including groundwater and air quality impacts plus waste management and noise risks associated with underground operations.
The mining plan envisages mechanical excavation rather than conventional blasting partly to minimise vibration risks affecting nearby residential structures. It includes backfilling excavated areas and measures intended to manage processing residues. Boron One states completion of an environmental impact study does not itself establish that all necessary approvals have been granted.
Piskanja financing gap: working capital not separately modelled; approvals still pending
Boron One’s principal challenge is converting the favourable preliminary economic assessment into a project able to attract sufficient construction capital. Initial investment requirement is stated at approximately €71 million, described as modest compared with many large international mining developments despite potential increases beyond base construction estimates.
The company lists working capital needs, financing costs, commissioning requirements, additional technical studies and potential cost escalation as factors influencing total capital required before stable commercial production begins. It says its published project cash-flow model assigns no separate working-capital requirement, which it frames as needing clarification during detailed financial modelling.
Boron One says no completed funding arrangement has been announced even though it indicates possible combinations could include equity investment, specialist mining finance, strategic industrial participation and debt financing. It also states commercial lenders would normally require more advanced feasibility work including verified reserves, updated operating-cost estimates, construction-risk analysis and adequate contractual protections before committing significant long-term funding.
The company adds that for Serbia the project could create industrial production export revenue and demand for domestic mining and processing services while offering Europe another regional source of boron products during supply-chain diversification efforts. It states neither outcome is assured by preliminary valuation alone because further work is needed on converting resources into commercially viable reserves, replicating processing performance at industrial scale and securing sales arrangements that support financeable operations.
