Silver Mines Elevates Bowdens Reserves to 93.5Moz with $1.04bn NPV in DFS

• Ore reserves increased 30% to 93.5Moz silver
• 26-year life of mine with staged development
• Pre-tax NPV5% of A$1.04 billion and IRR of 31.5%
• Strategic $12.5 million land acquisition enhances water security
• Exploration advances in California with high-grade silver assays

Bowdens Silver Project DFS Confirms Premier Status

Silver Mines Limited (ASX:SVL) has cemented its Bowdens Silver Project as one of the world’s leading undeveloped silver assets, announcing a Definitive Feasibility Study (DFS) that lifts ore reserves to 47.9 million tonnes at 60.8 g/t silver, equating to 93.5 million ounces of contained silver. The DFS outlines a robust 26-year life of mine (LOM) plan, split into two stages, with silver forecast to generate 91% of project revenue, up from 85% in the 2024 estimate.

The initial stage targets 29.9 million tonnes at 68 g/t silver for 65.4 million ounces over 16 years, benefiting from a low strip ratio of 1.47:1. Stage two, currently at pre-feasibility study level, aims to process the remaining 18.3 million tonnes, extending operations to 26 years with a slightly higher strip ratio of 1.69:1. The DFS’s financial metrics are compelling: a pre-tax net present value at 5% (NPV5%) of A$1.04 billion, an internal rate of return (IRR) of 31.5%, and a payback period of just three years post-production commencement.

Capital Costs and Operating Metrics

The DFS anticipates a total capital expenditure of A$455 million, a 37% increase from the 2024 study, primarily driven by the expanded process plant capacity and infrastructure. Operating costs have risen moderately, with mining costs at A$19.85 per tonne milled and all-in sustaining costs (AISC) at A$29.32 per ounce for Stage 1. Despite these increases, the project’s operating margin nearly doubles to A$1.81 billion, reflecting improved scale and resource quality.

Silver Mines has updated the process flowsheet to reduce overgrinding and simplified tailings filtration to a single-step pressure filtration, optimising metallurgical recoveries. Zinc and lead remain valuable by-products, with zinc contributing to approximately 4% of revenue alongside silver, both recognised as critical minerals by New South Wales authorities.

Progress on Regulatory Front and Strategic Land Acquisition

On the regulatory side, Silver Mines continues to advance the Bowdens Development Application (DA) redetermination with NSW’s Department of Planning Housing and Infrastructure (DPHI). Following legislative changes, the company refreshed ecological surveys and submitted an updated Biodiversity Development Assessment Report (BDAR), positioning the DA for assessment by the Independent Planning Commission of NSW. This careful approach aims to ensure a legally robust and low-risk pathway to project approval.

Complementing these efforts, Silver Mines secured a strategic 3,345-hectare freehold land parcel adjacent to Bowdens for $12.5 million in cash, enhancing water security, biodiversity opportunities, and infrastructure options including potential employee housing. This acquisition consolidates the company’s landholding around the project, providing a substantial buffer and operational flexibility.

Exploration Momentum in California and NSW

Exploration continues beyond Bowdens, with promising developments at the Calico North and Kramer Hills projects in California. A recent rock chip and field mapping program at Calico North yielded high-grade silver assays, including samples exceeding 1,900 g/t silver, alongside significant barite concentrations, another critical mineral. Preparations for phase one drilling are underway for both Californian projects.

In New South Wales, the Tuena Gold Project is being actively explored with soil sampling and mapping to develop new drill targets. The project area, historically known for gold rush activity, is being assessed for structurally controlled gold deposits analogous to nearby major discoveries.

Corporate and Financial Position

During the quarter, Silver Mines raised nearly A$8 million through the exercise of unlisted options, bolstered by a $7.56 million underwriting agreement with Petra Capital. The company ended the quarter with A$35.75 million in cash reserves, supporting ongoing exploration and project development activities. No mining or production activities were conducted during the period, consistent with the project’s development stage.

Silver Mines’ methodical advancement of Bowdens, combined with strategic land acquisition and exploration progress in both Australia and the US, positions the company for significant value creation. However, the second stage of Bowdens’ development remains at a pre-feasibility level, introducing a degree of uncertainty that investors should monitor closely as regulatory and technical milestones unfold.

Bottom Line?

Silver Mines’ DFS upgrade and strategic land purchase reinforce Bowdens as a top-tier silver project, but Stage 2’s pre-feasibility status warrants close attention ahead of regulatory decisions.

Questions in the middle?

• How will NSW planning authorities respond to the updated biodiversity assessment for Bowdens?
• What impact will Stage 2’s pre-feasibility status have on the project’s overall risk profile and financing?
• Can exploration successes in California translate into near-term resource upgrades or development plans?