Castle Minerals has made a transformative move in West Africa, finalising a binding agreement to acquire a 90% interest in the high-grade Niellé gold project located in northern Côte d’Ivoire. This strategic acquisition provides the explorer with a proven high-grade discovery in a premier gold district, immediately establishing Niellé as the company’s new flagship asset.
Project Scale and Location
The Niellé project covers a substantial 212 square kilometres within the richly mineralised Birimian greenstone belt. When combined with Castle’s existing 1,842-square-kilometre landholding and pending applications in Côte d’Ivoire, the company now holds significant district-scale exploration potential in one of West Africa’s most prolific gold corridors. A new exploration application has been submitted and is expected to be granted shortly. The asset attracted considerable interest from multiple parties, but Castle’s experienced local team secured the deal.
Regional Significance
Niellé is situated in a well-endowed regional corridor, just 50 kilometres north of the five-million-ounce Tongon gold mine. It lies along strike from major discoveries, including Pereus Mining’s Sissingué deposit (1.5 million ounces) and Endeavour Mining’s Wahgnion mine (3.2 million ounces). This geological setting underscores the project’s potential for significant gold mineralisation.
Historical Exploration Results
Previous exploration at Niellé has identified a compelling gold system extending over one kilometre of drilled strike within a broader 4.5-kilometre mineralised corridor that remains open along strike and at depth. Earlier work included extensive geochemical sampling and a 7,000-metre air-core drilling program that led to the discovery of a substantial gold anomaly. Historical reverse circulation drilling returned impressive shallow, high-grade results:
- 5 metres at 15.42 grams per tonne (g/t) gold from 7 metres, including 2 metres at 31.54 g/t gold from 8 metres.
- 13 metres at 5.07 g/t gold from 12 metres, including 3 metres at 16.33 g/t gold from 13 metres.
- 9 metres at 4.33 g/t gold from 86 metres, including 2 metres at 16.88 g/t gold from 88 metres.
Broad zones of consistent gold mineralisation further highlight the scale potential, with results including:
- 26 metres at 1.95 g/t gold from 32 metres, including 4 metres at 5.51 g/t from 42 metres.
- 26 metres at 1.79 g/t gold from 108 metres, including 2 metres at 6.07 g/t from 110 metres.
Strategic Advantages
Castle Resources managing director Steve Zaninovich commented: “Niellé represents a rare opportunity to secure a high-grade gold project with demonstrated scale and immediate upside in a tier one jurisdiction.” The shallow, high-grade nature of the deposit is expected to facilitate rapid resource definition, with significant upside remaining due to limited historical drilling relative to the system’s size. This leaves clear opportunities to expand the known mineral zone across the entire corridor.
Local Expertise
Castle is not new to Côte d’Ivoire. The company’s in-country project and business development manager, Mohamed Niaré, has over 25 years of experience operating in Mali and Côte d’Ivoire, providing valuable local networks and operational expertise. This regional knowledge gives Castle a competitive edge in West Africa, where trusted relationships are as important as geological potential.
Portfolio Optimisation
To focus on Niellé, Castle is divesting its Ghanaian gold assets. The company has signed an indicative terms sheet to sell its wholly owned Ghanaian subsidiary, Carlie Mining, for US$400,000 (A$552,000). An initial US$250,000 (A$345,000) will be received upon signing the share purchase agreement, with the balance due two months later. This quick exit allows Castle to recycle capital directly into its Côte d’Ivoire operations.
In Australia, Castle retains its dominant 184-square-kilometre Meeka South gold project in Western Australia’s Murchison gold district, strategically located near Westgold Resources’ Bluebird mill and surrounded by established gold operations.
Next Steps
Castle plans to fast-track Niellé towards a maiden mineral resource estimate. Management is in advanced discussions to acquire the historical data package for a detailed technical review, which will guide a targeted infill and step-out drilling campaign. With a proven high-grade discovery, a massive underexplored 4.5-kilometre corridor, and drill-ready upside, Niellé has the potential to become a company-making asset. If upcoming drilling successfully extends known zones and converts historical hits into a maiden resource, Niellé could quickly emerge as one of the most closely watched junior gold stories in West Africa.
