Boron One Holdings has updated the projected economics for its Piskanja boron project in southern Serbia, raising the estimated after-tax net present value to about €569 million. The company’s model also forecasts an 89% after-tax internal rate of return on initial capital expenditure of approximately €71 million. The update comes as European manufacturers look for alternative supplies of critical industrial minerals.
The revised preliminary economic assessment was published on October 14 and uses an 8% discount rate. It forecasts initial capital recovery within 12 months of commercial production. The company said the project remains in a preliminary development stage, with technical, environmental, permitting and financing requirements still to be addressed.
The updated study also reduces the expected operating life from 16 years to 13 years. It reports lower projected average annual operating earnings despite improved headline investment returns. For prospective investors and lenders, the difference between preliminary economics and a bankable construction package is expected to be central to the next development phase.
Preliminary financial metrics and assumed development schedule
The updated assessment estimates average annual gross revenue of about €125 million. Total revenue over the proposed operating period is put at around €1.75 billion. Average annual earnings before interest, taxes, depreciation and amortisation are projected at approximately €78 million, while cumulative after-tax project cash flow before financing is estimated at more than €1.03 billion.
Initial capital expenditure, including contingency, remains approximately €71 million. Sustaining capital is forecast at a further €34 million over the operating life. The financial model assumes a construction period of about 24 months.
The company characterises the resulting returns as unusually high by conventional mining-investment standards. It highlights that an internal rate of return of 89% would compare favourably with capital-intensive mining developments that require several hundred million euros before commercial production. The assessment also notes that it is intended to establish potential viability rather than confirm that modeled cash flows can be achieved.
Boron One states that its capital and operating cost estimates have a preliminary accuracy range of around ±35%. The uncertainty is described as significant for a project involving underground excavation, mineral processing, infrastructure construction and future chemical production. The current work is therefore presented as a basis for further development rather than an investment decision supported by final engineering and binding construction costs.
Resource base, mine plan and operating-life reduction
The updated study incorporates revised geological modelling, metallurgical testing, geotechnical investigations and changes to assumptions about the planned mining sequence. Boron One 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 grading 32.4% boron trioxide.
The company equates that grade to about 2.31 million tonnes of contained boron trioxide. The resource includes deposits containing colemanite, ulexite and mixed borate minerals. Boron One said these resources have not been converted into declared mineral reserves and commercial extraction has not been demonstrated through a completed feasibility study.
The revised project plan sets an average annual underground mining rate of roughly 433,000 tonnes for commercial production spanning 13 years. The shorter operating life concentrates expected cash generation into a smaller timeframe. It also reduces the period available to recover from construction delays, production interruptions or sustained periods of weaker commodity prices.
Boron One said further exploration could improve the long-term production profile but that additional resources cannot be assumed in the current investment case. It also indicated that higher headline investment returns do not remove the need for operational resilience and potential resource expansion.
Processing strategy and product pricing assumptions
Piskanja’s commercial strategy extends beyond exporting unprocessed minerals, according to Boron One’s plan for processing facilities on site. The development includes production of saleable colemanite and ulexite concentrates alongside downstream boric acid production .
The preliminary assessment targets average annual output of about 157,600 tonnes of colemanite and 83,800 tonnes of ulexite. It also forecasts boric acid production later in the mine’s operating life at around 25,000 tonnes per year . Colemanite and ulexite are described as being used in glass, ceramics, chemicals and other industrial applications.
The model assumes sales prices equivalent to approximately €579 per tonne for commercial-grade colemanite and ulexite and €890 per tonne for technical-grade boric acid. Boron One describes these figures as modelling assumptions rather than guaranteed future selling prices . It also said domestic processing could generate greater industrial value than a project focused only on raw mineral exports.
The company said the economic advantages depend on achieving planned recovery rates, maintaining product quality and operating processing facilities at competitive costs . It added that boric acid production will require more complex chemical processing than conventional beneficiation, including acid leaching, crystallisation, separation and product purification.
Boron One said 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 requirements for this processing stage .
European supply context and early offtake terms
Piskanja’s location in Serbia is presented by Boron One 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 remains described as dominant].
European demand is described as spanning glass manufacturing, ceramics, agriculture, advanced materials and specialised industrial applications. Boron is also linked in the assessment to technologies supporting renewable energy, electronics and advanced manufacturing [borates]. Boron One said developing another source in Southeast Europe could support supply diversification and shorten transport routes for some customers.
The company cautioned that strategic importance does not guarantee commercial competitiveness. It said European manufacturers will assess suppliers based on product specifications, delivery reliability, contract prices, sustainability performance and long-term production stability [Piskanja]. Boron One expects it will need to demonstrate consistent performance while competing with established international producers with larger operating networks.
Boron One said it has secured an initial binding commercial offtake agreement covering future boron products announced in May 2026 [Boron One Holdings]. The agreement provides for minimum annual purchases of 25,000 tonnes with an option to increase volumes to 50,000 tonnes [take-or-pay]. 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 sales uncertainty [price floor]. Boron One said commitments remain subject to conditions including regulatory approvals and successful qualification of production facilities [qualification]. The buyer is not publicly identified and the minimum price has not been disclosed.
Boron One said the committed minimum volume represents less than one-tenth of projected combined annual output across commercial products [25,000 tonnes]. It added that most planned production would still require additional sales arrangements beyond this initial agreement [offtake]. For lenders considering project finance, it highlighted customer creditworthiness, contract duration, pricing mechanisms and enforceability as critical factors.
Sensitivity results, market-price risk and environmental work
The updated assessment includes sensitivity calculations tied to revenue and product price changes affecting project value [NVP]. Under the base case scenario after-tax net present value is about €569 million [8% discount rate]. A 20% reduction in assumed concentrate prices would lower calculated value to roughly €404 million while holding other model variables constant [€404 million].
Boron One said the project would retain a positive preliminary valuation under that scenario but noted it underscores reliance on future selling prices [concentrate prices]. It also stated economics depend on maintaining planned underground production rates and processing performance [433,000 tonnes/year] . The company described boron markets as less transparent than exchange-traded metals.
Boron One said pricing assumptions therefore require careful validation through independent customer confirmation [product qualification] . For investors it said evidence of realised market prices, product qualification and binding sales contracts would carry substantial weight [binding contracts] . It added that high returns shown under selected assumptions can attract interest but financing requires confidence those assumptions can withstand market fluctuations and operational difficulties.
Balkan Gold holds the exploration licence for Piskanja as part of Boron One’s Serbian subsidiary structure [Balkan Gold] . The company commissioned the Mining Institute in Belgrade to prepare an environmental impact study completed in November 2025 [EIA documentation] . The study addresses environmental monitoring including groundwater, air quality, waste management and noise risks associated with underground operations.
The mining plan envisages mechanical excavation rather than conventional blasting partly aimed at minimising vibration risks affecting nearby residential structures [mechanical excavation] . It also includes backfilling excavated areas and measures intended to manage processing residues [backfilling] . Boron One said completing an environmental impact study does not itself establish that all necessary approvals have been granted.
The project must still proceed through Serbian licensing procedures while demonstrating compliance with environmental and mining requirements [Serbia licensing procedures] . For international investors it said independent verification of environmental performance, community impacts and permitting conditions would be important during due diligence [diligence] . Environmental approval remains one element among technical risks associated with underground mining plans.
Financing requirements beyond preliminary valuation
Boron One identified converting its favourable preliminary economic assessment into a project capable of attracting sufficient construction capital as its principal challenge . It said initial investment requirement is approximately €71 million relative to many large international mining developments . However it noted eventual financing may need to cover more than base construction estimates including working capital needs .
The company cited working capital requirements, financing costs, commissioning needs, additional technical studies and potential cost escalation as factors influencing total capital required before stable commercial production . In its published cash-flow model it assigned no separate working-capital requirement . Boron One indicated this issue would need clarification during detailed financial modelling.
Boron One said a financing package could combine equity investment with specialist mining finance, strategic industrial participation and debt but no completed funding arrangement has been announced . It stated 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 financing . For Serbia it expects potential industrial production export revenues and additional demand for domestic mining services but did not link those outcomes directly to approvals or bankability beyond preliminary valuation .
The October update placed emphasis on potential returns from limited initial capital commitment while noting next steps are more demanding: converting geological resources into commercially viable reserves; replicating processing performance at industrial scale; and securing sales arrangements capable of supporting a financeable operating business . Boron One highlighted the gap between estimated initial investment of €71 million and projected net present value near €569 million as central for lenders evaluating how much value remains once construction costs product prices permitting requirements and operating risks are established with greater certainty .
