St Barbara Limited Announces 15-Mile Processing Hub: Capital-Efficient 3 Mtpa Gold Plant with 1,084M A$ NPV & 76% IRR

Thursday, May 29, 2025
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8:19 am
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St Barbara Limited’s new Concept Study confirms a 3Mtpa processing hub integrating multiple projects for stable, robust gold production above 100,000 ounces annually. With a low initial capital cost of approximately C$251 million and strong project economics, the development delivers impressive growth potential and reduced environmental impact.

St Barbara Limited has released details on its 15-Mile Processing Hub Concept Study, outlining a development strategy that integrates the Cochrane Hill project with existing operations from 15-Mile and Beaver Dam. The study, classified as an AACE Class 5 assessment with an accuracy of approximately ±50%, endorses the construction of a 3 million tonnes per annum processing plant. This facility is designed to relocate the existing Touquoy plant while incorporating a larger 5.5MW ball mill and one additional leach tank, ensuring that mill feed from Beaver Dam and the redesigned Cochrane Hill deposit is trucked in via public roads. The technical review estimates a stable gold production profile averaging around 106,000 ounces per annum over an 11-year mine life, with a life-of-mine (LOM) total of approximately 1.2 million ounces. The project economics indicate an attractive capital-efficient outcome with an initial capital expenditure of roughly C$251 million and sustaining capital of C$365 million, supported by low all-in sustaining costs averaging around US$1,197 per ounce. In addition, sensitivity analyses reveal a post-tax net present value at a 5% discount rate of roughly A$1,084 million and an internal rate of return near 76%, based on a gold price of US$2,500 per ounce and favorable exchange rate assumptions. Environmental and community considerations are key features of this revised approach. The Cochrane Hill design has been fundamentally altered to reduce surface disturbance, for example, eliminating the need for tailings management and water extraction at that site. The project’s footprint at 15-Mile has been cut by about one-third, while Beaver Dam’s disturbance has fallen by over half, thereby reducing the construction of significant haul roads and lowering overall environmental impact. The design also integrates backfilling and improved water management practices that are anticipated to mitigate historic ground and surface water contamination while enhancing local fish habitat. The study further concludes that the reuse of equipment and infrastructure from the dormant Touquoy operation not only speeds up the payback period—with pre-tax and post-tax paybacks estimated at 1.0 and 1.2 years respectively—but also creates opportunities to lower overall capital costs. St Barbara Limited’s CEO, Andrew Strelein, emphasized that these integrated operations promise a smooth mining schedule with staged commencement for each deposit and secure environmental approvals. The permitting process in Nova Scotia has improved, with both federal and provincial governments streamlining approvals, while specialist teams have been established to handle environmental compliance for large projects. On the bullish side, the encouraging project economics—with a robust IRR and low initial capex estimates—combined with significant reductions in environmental impact and strong operational synergies lent by reusing existing assets, offer an attractive prospect for investors. The stable production profile, extended mine life, and strong sensitivity outcomes under varying gold price and cost scenarios add further credence to a positive outlook. Conversely, some bearish considerations remain. The Concept Study’s ±50% accuracy indicates that further technical and economic assessments are required before a definitive valuation can be secured. Investors should also be cautious about the uncertainties tied to funding these capital requirements, which could involve dilutive capital raises or debt. Additionally, while the environmental redesign increases community acceptance, any delays in regulatory approvals could impact project timelines and financial projections. Overall, the 15-Mile Processing Hub Concept Study presents an attractive opportunity as it marries technical innovation with cost efficiency and environmental stewardship, though the inherent risks at this early assessment stage remind investors to carefully weigh the potential rewards against the uncertainties ahead.

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