This target can be classified as iron oxide copper gold (IOCG) type. Several mineral deposits of this type have recently been recognised in Zambia, genetically and spatially related to the major sediment-hosted deposits of the nearby Copperbelt. They are generally underexplored compared to the Copperbelt deposits. The Kajevu Project has not previously been systematically explored and no historic drilling is known which might have tested its’ extension to depth or along strike.
Historic records report trenching results of 2.86% Cu over a width of 36m, indicating potential for wide copper intervals within the Kajevu zone. A small open pit trial mine approximately 150 metres long and 15 metres deep was developed by Matrix Mining Co. over a steeply dipping, hydrothermally altered copper-gold bearing quartz vein zone. Mining recovered high-grade hand-picked copper, as well as alluvial gold nuggets. Bulk sample material from the open pit was stockpiled at surface for possible future ore processing – this includes considerable stacks of partially sorted high-grade copper ore.
At one end of the pit a breccia zone of iron-rich quartz is exposed within siltstone host rock over a width of 3-5 metres, with strong visible copper mineralisation in the form of malachite and chalcocite throughout the matrix and on fractures. Selective composite grab samples taken by Xtract from this mineralisation returned assay values ranging 3.99-7.28% Cu, 1.0-3.42g/t Au.
The vein system can be traced continuously within the Licence for at least 800 metres from the eastern end of the open pit to the western margin of the Licence. The system continues to be strongly altered and brecciated, with iron-rich matrix as seen at the mineralised pit exposure, however there is no visible copper mineralisation at surface outside the pit, perhaps due to near-surface leaching. To the east the vein is generally less altered and brecciated, but strong copper mineralisation is exposed in a trial digging within the southeast corner of the license, more than 2 kilometres from the open pit. A selective grab sample taken from mineralised material at this locality returned assay values of 4.49% Cu, 2.94g/t Au.
Soil sampling by Xtract has shown a coherent iron-potassium geochemical anomaly extending due eastwards for over 2.5 kilometres from the open pit. This might represent the signature from an intrusive body and/or a widespread hydrothermal alteration system related to the source of the copper mineralisation.