Castle Minerals Secures $4M to Fast-Track Nielle Gold Project in Côte d’Ivoire
Key Takeaways
- Castle Minerals has raised $4 million via placement at $0.075 per share — a 4.7% premium to the 15-day VWAP — giving the company $5 million in gross cash before costs to advance the Nielle Gold Project.
- The Nielle project comes with a US$3 million historical exploration dataset covering a 4.5km mineralised gold corridor, allowing Castle to move directly to drill target generation rather than rebuilding baseline geology from scratch.
- The critical gating item is permit approval from the Côte d'Ivoire Ministry of Mines — without it, the Nielle acquisition cannot complete and drilling cannot commence.
- Castle's proposed Ghana divestment has fallen over after the exclusivity period expired in July 2026, though two new parties have since expressed interest in the Ghanaian assets.
- Castle has proposed rebranding to TerraNova Metals, subject to shareholder approval, signalling a strategic repositioning around its West African gold focus.
Castle Minerals has secured $4 million via placement to advance its flagship Nielle Gold Project in northern Côte d’Ivoire. The placement was priced at $0.075 per share, representing a 4.7% premium to the 15-day VWAP and a 2.6% discount to the last close. The raising was strongly supported by existing sophisticated and professional investors, with the Board committing to participate for a further $75,000 subject to shareholder approval. The placement provides Castle with $5 million in gross cash available before costs, positioning the company to progress priority exploration and corporate initiatives. Castle has proposed changing its name to TerraNova Metals, subject to shareholder approval.
Inside the $4 million placement
The placement will be issued in two tranches, raising $4 million through the issue of 53,333,334 new shares at $0.075 per share. The Directors have committed to participate on the same terms for a further $75,000 in aggregate, subject to shareholder approval under ASX Listing Rule 10.11.
Euroz Hartleys acted as Lead Manager to the placement. Castle has agreed to issue 12 million unlisted Broker Options to the Lead Manager (or its nominee), with an exercise price of $0.15 and expiry date of 31 October 2028, subject to shareholder approval.
| Tranche | Shares issued | Amount raised | Listing Rule / Approval | Expected timing |
|---|---|---|---|---|
| Tranche 1 | 38,200,000 | $2.865M | ASX LR 7.1 & 7.1A | Settlement: 4 Sep 2026 Trading: 7 Sep 2026 |
| Tranche 2 | 16,133,334 | $1.21M | Shareholder approval | Mid-Oct 2026 |
| Total | 53,333,334 | $4M | — | — |
Placement timetable key dates:
- 28 August 2026: Announcement of placement and recommencement of trading
- 4 September 2026: Settlement of Tranche 1 new shares
- 7 September 2026: Allotment and normal trading of Tranche 1 new shares
- Mid-October 2026: Shareholder approval for Tranche 2, Director participation and Broker Options
- Mid-October 2026: Settlement, allotment and trading of Tranche 2 new shares
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Why Nielle is Castle’s flagship near-term catalyst
Nielle represents the priority value driver for Castle. The company has received the complete historical exploration dataset, representing estimated historical exploration expenditure of more than US$3 million by previous exploration groups. The dataset provides a technical foundation for accelerating geological interpretation, target generation and drill planning.
The project covers a 4.5km mineralised corridor with multiple high-grade historical gold intersections and largely underexplored ground. Castle’s immediate focus this quarter is to complete the technical review and interpretation of the historical dataset, integrate the historical drilling, geochemistry and geological information, and define priority drill targets.
The planned exploration programme is expected to include infill and step-out drilling to test and extend known mineralisation, together with supplementary soil geochemistry and regional target generation where appropriate. The objective is to improve geological confidence and continuity across the known mineralised zones and, subject to exploration results, progress Nielle towards a maiden Mineral Resource estimate in accordance with the JORC Code.
Critical milestone: The Nielle permit application remains subject to approval by the Côte d’Ivoire Ministry of Mines, Petroleum and Energy. Grant of the exploration licence is a key condition to completion of the Nielle acquisition and commencement of the planned drilling programme. Castle will continue to work with the local vendor and relevant authorities to progress the grant.
Steve Zaninovich, Managing Director
“Most juniors spend their first two field seasons and their first few million dollars getting to where Nielle already sits. The historical dataset hands us more than US$3 million of exploration we don’t have to repeat, including drilling, geochemistry and geology across a 4.5km mineralised gold corridor. Our job now is to turn that work into drill targets. What makes this more than a data exercise is the people. Members of our team worked this ground previously and have waited years for the chance to get back onto it. We are not starting from scratch technically or on the ground, and that means we can move the moment the licence is granted. The support for this raising, including from the Board, means we arrive at that moment funded and ready. We are looking forward to discovering Nielle’s full potential.”
How historical datasets de-risk early-stage gold exploration
Acquiring an existing US$3+ million exploration dataset saves juniors the time and capital they would normally spend building baseline geology, geochemistry and early drilling from scratch. This dataset gives Castle a technical head start, compressing the timeline to drilling and potential value catalysts.
A mineralised corridor refers to a zone where gold mineralisation has been identified over a continuous strike length — in Nielle’s case, 4.5km. Infill drilling tests the continuity and grade of known mineralisation between existing drill holes, while step-out drilling extends the search into adjacent ground to test whether mineralisation continues beyond known boundaries.
A maiden JORC Resource is the first formal estimate of mineral inventory prepared under the Australasian Joint Ore Reserves Committee (JORC) Code. It classifies the quantity and quality of mineralisation into categories (Inferred, Indicated, Measured) based on geological confidence. For Castle, achieving a maiden JORC Resource at Nielle, subject to exploration results, would mark a critical milestone in demonstrating the project’s economic potential. The historical dataset positions Castle to move directly to drilling once the licence is granted, rather than spending years on foundational work.
A broader gold portfolio across two premier regions
Castle is a West African–focused gold explorer with tenure positions in Côte d’Ivoire and Western Australia. Beyond Nielle, the company holds interests in eight permits across Côte d’Ivoire (one granted, seven under application), with the remaining “CDI East” permits sitting along the Côte d’Ivoire–Ghana border.
The CDI East exploration pipeline is advancing, with regional soil sampling underway at the granted Ebony permit and two additional permits well advanced towards grant across Castle’s ~1,842km² project area. All are located on Birimian greenstone belts that host numerous multi-million-ounce gold deposits across West Africa.
In Western Australia, Castle holds the Meeka South Gold Project, a contiguous ~184km² landholding in the Murchison Gold District. The project incorporates Castle’s Polelle and Wanganui projects together with the 68km² Meekasan tenure acquired in May 2026. Meeka South is immediately adjacent to Westgold Resources’ Paddy’s Flat operation, which has historic production of more than 1.5Moz, and proximal to Great Boulder Resources’ Mulga Bill project.
The consolidated tenure covers more than 30km of prospective greenstone strike and has seen relatively limited historical drilling, providing substantial scope for systematic exploration.
High-grade historical RC intercepts at Wanganui (source: Castle ASX announcement dated 19 August 2020):
- 3m @ 18.66g/t Au from 62m
- 8m @ 4.10g/t Au from 66m
- 10m @ 3.34g/t Au from 56m
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Ghana portfolio optimisation and what comes next
The proposed divestment of Castle’s wholly owned Ghana subsidiary, Carlie Mining Limited, will not proceed. The transaction was subject to an indicative, non-binding terms sheet only. As the parties were unable to agree the terms of binding transaction documentation, the proposed sale will not proceed, and the exclusivity period granted to the proposed purchaser expired at the end of July 2026.
Castle is now free to engage with other parties regarding the Ghanaian assets. The company has received expressions of interest from two other parties so far and will continue to assess these opportunities as it seeks to realise value from the Ghana portfolio, while maintaining its strategic focus on its Côte d’Ivoire gold assets.
Use of funds:
- Settlement of the Nielle Gold Project acquisition (subject to permit grant and transaction conditions)
- Initial exploration and drilling at Nielle, including technical review, target generation, site establishment, community programmes, infill and step-out drilling and supplementary geochemistry
- Exploration across the Meekatharra portfolio, including target generation and priority drilling programmes
- General working capital and corporate purposes
Castle arrives at the licence grant milestone funded and ready to move. The company’s priority remains allocating capital to its highest conviction exploration opportunities while maintaining financial flexibility across its portfolio. With $5 million in gross cash available before costs, Castle is positioned to advance Nielle the moment the permit is granted, compress the timeline to drilling, and progress towards a maiden JORC Mineral Resource estimate, subject to exploration results.
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