Copper 360 intersects mineralisation early at Rietberg

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JSE-listed Copper 360 advises that the incline at the Rietberg underground mine, in the Northern Cape, has intersected copper sulphide mineralisation about 16 m before reaching the planned 300 Level (300L) elevation.

This is earlier than expected from the company's geological model and could represent a new mineralised body, it highlights.

Assays from bulk sampling of the intersection have returned representative grades ranging between 0.48% and 1.50% total copper.

The intersection was made on October 6, and management immediately followed up with geological mapping and sampling.

The mineralisation is hosted in the mafic rocks of the Koperberg Suite, with visible bornite and chalcopyrite.

The planned 400 to 300 Level incline has progressed through this intersection, exposing about 6 m of mineralised mafic rocks.

To obtain representative samples, two composite samples were collected from the stockpile of the mineralised material.

The samples were crushed to –10 mm, homogenised by coning and quartering and subsequently submitted for assay.

Samples were assayed at QLS Laboratory (unaccredited) in Springbok for total sulphide copper.

No acid-soluble analysis was done since no oxide copper minerals were observed and the intersection is far below the known oxide and transition zones, Copper 360 points out.

Quality control samples were included, and all returned results fell within acceptable industry limits.