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Nielle Gold Project

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Castle Minerals has executed a binding agreement to acquire a 90% interest in the Nielle Gold Project, a highly prospective gold project located in northern Côte d’Ivoire within the prolific Senoufo greenstone belt.

Nielle represents a strategically significant addition to Castle’s West African portfolio, positioning the Company with a demonstrated high-grade gold system in one of the region’s most endowed and active gold provinces.

The Project is located approximately 50km north of the 5Moz Tongon Gold Mine and within a broader district hosting several major gold deposits including Sissingué (1.5Moz), Wahgnion (3.2Moz) and Syama (11.5Moz). The Project area covers approximately 212km² of highly prospective Birimian greenstone terrain.

Historical drilling at Nielle has defined a shallow, high-grade gold system over a drilled strike exceeding 1km within a broader 4.5km mineralised corridor that remains open along strike and at depth.

Significant historical drill intersections include:

5m @ 15.42g/t Au from 7m (incl. 2m @ 31.54g/t Au)

13m @ 5.07g/t Au from 12m (incl. 3m @ 16.33g/t Au)

9m @ 4.33g/t Au from 86m (incl. 2m @ 16.88g/t Au)

Gold mineralisation at Nielle is associated with strong alteration, sulphide mineralisation and quartz-carbonate veining consistent with a structurally controlled orogenic gold system.

Despite the strong historical drilling results, exploration at Nielle remains at a relatively early stage, with limited drilling completed across the broader mineralised corridor. Historical air core drilling defined a gold anomalous trend extending for more than 4.5km, much of which remains untested by follow-up drilling.

Castle believes the Nielle Gold Project has significant scope for:

extension of known mineralisation along strike and at depth;

definition of additional mineralised zones;

systematic infill and step-out drilling; and

advancement toward future Mineral Resource estimation.

The Company’s objective is to rapidly advance Nielle through systematic exploration and establish the Project as a flagship asset within Castle’s expanding Côte d’Ivoire portfolio.

Nielle strengthens Castle’s growing presence in Côte d’Ivoire, one of the world’s fastest growing gold exploration and mining jurisdictions. The Company’s in-country team, led by experienced West African mining professionals, provides a strong platform for rapid project advancement and execution.

The acquisition aligns with Castle’s broader strategy of building a focused portfolio of high-quality gold assets across Côte d’Ivoire and Western Australia.

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