Kpali Gold Project

Ghana’s Upper West Region and Castle’s key prospects. Also shown is the convergence on Castle’s Degbiwu and Gbiniyiri licences of the Wa-Lawra and Bole-Bolgatanga Birimian greenstone belts plus three regional-scale structures associated with several major gold deposits.
Kpali Gold Prospect: Notable intercepts from June 2025 RC drilling programme with selected historical drilling results.
North-south long-section through mineralised hangingwall and footwall lodes.
Cross-section (1029330mN) showing latest drill holes and multi-lode distribution of high-grade mineralisation.
Bundi Prospect: Plan of recent and historical drill results.
Key prospects on VTEM with structural interpretation highlighting controls of known mineralisation and numerous areas to be tested.
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Drilling at Kpali, August 2024
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Drilling at Kpali, August 2024
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Drilling at Kpali, August 2024

Background

The Kpali Gold Project comprises the Kpali prospect and the nearby Bundi prospect plus several satellite discoveries which lie ~30km west of regional town, Sawla. These prospects are situated within the 170km² Degbiwu prospecting licence (PL 10/26) which is surrounded by the 1,033km² Gbiniyiri retention licence (RL 8/27). The western border of each licence is the Black Volta River which also borders with Burkina Faso. Both licences are owned 100% by Castle through its wholly owned Ghanaian subsidiary, Carlie Mining Limited.

The main exploration driver, and original reason for investigating this area, is the extremely strong geological focal point provided by the convergence of two major greenstone belts (Bole-Bolgatanga and Wa-Lawra/Boromo) and three traversing regional-scale structures. These are individually associated with several major gold deposits and operating mines making Castle’s ground very compelling:

Castle is of the view that whilst very interesting in their own right, the Kpali Gold Project’s prospects, which also includes the Kpali East, Bundi, Wa South and Wa East prospects, may be indicative of a major gold “camp” hosting one or more large primary mineralised systems. These camps are typical of West African structurally-controlled orogenic gold environments and underpin the region’s status as one of the world’s most well-endowed gold regions.

Gold anomalism and near-surface mineralisation, such as that already discovered at the Kpali Gold Project, provides a means to vector into and chase down-plunge major ore shoots which can extend to several hundred metres depth.

Recent Drilling

Kpali Prospect

Kpali was a virgin discovery in 2013 arising from systematic wide-spaced RAB drilling and power-auger geochemical sampling beneath a veneer of transported soil cover. Some 2,711 RAB holes have been drilled in the Kpali-Bundi area.

The geology at Kpali is dominated by low-grade metamorphosed sediments and volcaniclastics, with a lesser amount of mafic volcaniclastics. This sequence is intruded by a coarse-grained felsic circular body that demarcates the eastern boundary of the mineralisation.

Mineralisation runs north-south, is generally steeply dipping and occurs as a number of distinct, individual, more or less planar-lodes, that vary between 2m to 20m in thickness. These lodes are mostly continuous and were consistently intersected in drilling along an established central trend of some ~500m that remains open to the south and possibly also to the north.

Kpali East Prospect

The Kpali East prospect, 500m east of Kpali, was identified by soil sampling and regional RAB drilling undertaken in 2013 and 2014 to follow-up the Kpali discovery and to test a de-magnetised zone delineated by interpretation of historical aeromagnetic data acquired by Castle.

The RAB intercepts overlie the east side of the Kpali granite and are aligned with the de-magnetised corridor which trends east-southeast across the southern portion of Castle’s licence area. Initial follow-up with RC drilling in mid-2014 produced some encouraging anomalous intersections. Further work is required.

Bundi Prospect

The Bundi prospect, situated 4km north-northwest of Kpali, was discovered in 2013 by Castle following reconnaissance soil sampling, auger drilling and RAB drilling. RC drilling was undertaken later in 2013 and 2014 with 16 of 20 RC drillholes reporting mineralisation and a best intercept of 51g/t Au over 1m.

Interestingly, there also appears to be an association of zinc sulphides with the gold mineralisation (refer ASX release 23 May 2013) suggesting that Bundi may represent the distal expression of a volcanogenic massive sulphide horizon. This is not unsurprising as the Perkoa zinc mine lies on the same Wa-Lawra / Boromo greenstone belt where it extends to the north into Burkina Faso. Further exploration and study work is required to verify this hypothesis but is not a priority at present.

The Bundi prospect comprises linear, continuous vertically dipping mineralisation over a strike of ~1,400m and to at least 100m depth. It remains open in both directions.

It is hosted within altered Birimian shales and sediments. Gold mineralisation is associated with quartz-sericite schist (metamorphosed felsic volcanic) with sericite alteration and 1-3% disseminated sulphides (incl. sphalerite).

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