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Castle eyes new Ghana targets to fuel resource upgrade

Updated: 4 days ago

Drilling at Castle Minerals’ Kambale graphite project in Ghana. Credit: File

Castle Minerals has identified 13 new high-priority, potentially-graphitic targets at its Kambale project in Ghana and will now work on them in a bid to lift its current resource estimates ahead of a scoping study this year.

The company’s latest targets are distributed broadly across a 275-line-kilometre Loupe electromagnetic (EM) survey area that covers less than half of the total project licence area, leaving significant ground yet to be surveyed for additional resource potential. Three of the new targets lie within the boundaries of a smaller and more focussed horizontal loop EM (HLEM) survey that was undertaken last year across the defined mineral resource estimate of 15.6 million tonnes at 9 per cent total graphitic carbon (TGC), containing 1.41 million tonnes of graphite. The company believes the overlap can be considered mutually supportive.

The remaining 10 targets are less than 8km from the resource centre and Castle says they appear to be closely associated with three pronounced district-scale linear geophysical trends.

With previous EM targets now known to be graphitic and primarily associated with graphitic schists, including those defined by combined HLEM and drilling over the company’s main resource area, it believes it may be inferred that the latest targets also have a high potential to be graphitic.

Knowing that a previous EM survey was successful in identifying additional graphitic schists at Kambale, we are naturally very keen to test this latest series of 13 priority-one targets identified by the recent Loupe EM survey. Kambale already hosts a sizable 15.6Mt Mineral Resource grading 9.0% TGC containing 1.41Mt of graphite and we are hopeful of materially increasing this when we process the results of the just completed 43-hole, 5,335m infill RC drilling programme. Any additional material located on the broader licence area using the Loupe EM data will improve options for optimising a mining and on-site processing operation. Castle Minerals managing director Stephen Stone

Results from a 43-hole reverse-circulation (RC) drill program that put 5355m of extensional drilling into the HLEM geophysics area over the current mineral resource, are expected to deliver an upgrade to the resource numbers. A revision is expected later this month.

Metallurgical testwork is also underway to evaluate the Kambale graphitic material to produce an optimal fine flake graphite bulk concentrate of commercially-acceptable specifications. Management expects it will be completed this month.

Castle says it will fast-track its exploration programs at Kambale to process results from the extensional RC drilling in a bid to upgrade its maiden mineral resource estimate. It also plans to undertake additional work aimed at establishing a scoping study and identifying possible project development areas and offtake partners.

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