Lunga (Kujima AfricanEagle) - Zambian Copperbelt (sitios de interés)

HISTORY
The Rhodesian Congo Border Concession investigated the area during the 1920s and 1930s, where they claimed the Chifumba and Jumbo copper prospects. Primary copper mineralisation was defined by diamond drilling and shaft sinking at Chifumbo, wheras at Jumbo, a reported 10,000 t of ore with a mean grade of 3.5% Cu was produced from 300m of underground development. The company concluded the mineralisation terminated against a fault and so stopped work.

Between 1958 and 1961, Chartered Exploration defined a number of geochemical anomalies including the Kaungashi, Buffalo and Wambo Prospects.At Kaungashi, the exploration outlined lead-zinc and copper-zinc soil anomalies over a substantial strike length. Pitting and wagon drilling revealed that the mineralisation was most likely associated with a series of syenite intrusions, with hydrothermal alteration and mineralisation of surrounding
breccias in phyllites and limestones. Two prospecting shafts were sunk and a limited number of diamond drill holes completed which confirmed that zinc mineralisation was associated with syenite contacts.

At the Buffalo copper prospect, follow-up work to the Chartered Exploration regional prospecting was undertaken by Zamex, who drilled four diamond drillholes in 1961, yielding a number of significant drill intercepts, including one of 28.0m which averaged 1.1% Cu.

At the Wambo Prospect, Chartered Exploration outlined base metal mineralisation (Cu, Pb, Zn) and follow-up work culminated in the drilling of three diamond drillholes by Zamanglo in 1970. These holes intersected significant zinc mineralisation associated with graphitic dolomite breccias, including one intersection of 119.0m which averaged 1.2% Zn. Between 1994 and 1996, Phelps Dodge undertook soil sampling, mapping and chip sampling over the Buffalo, Jumbo and Kaungashi prospects. This work was preliminary, unsystematic and inconclusive,although high grades of copper and zinc were found in the initial rock sampling.

In 2000, Avmin repeated some of the earlier work through a combination of geochemical and geophysical surveys, geological mapping, surface sampling and trenching. One trench at the Kuanhashi prospect yielded a 9m intersection with mean grades of 1.9% Cu and 2.2% Zn. This work was followed up by 4,750m of air core drilling to identify the host lithologies. Two main anomalous zones were identified from the drilling; a southern zone principally developed over a diamictite (Grand Conglomerat) and a northern mineralised zone, possibly structurally controlled, cross cutting the lithologies. Better intersections included 3.6% Zn over 12m and 1.4% Cu over 4m.

In 2001, a 5 hole diamond drill programme, comprising 1,194m, was completed at both the Kuangashi and Buffalo prospects. Although no economic intersections were obtained, stratabound mineralisation associated with the Grand Conglomerat showed the entire horizon to be highly anomalous for both Cu and Zn. One of the holes yielded an uncorrected 90m intersection with average grades of 0.7% Zn and 0.3% Cu. Higher grade intersections include 1.72m at 2.3% Cu. The mineralisation comprised chalcopyrite associated with veins, veinlets, stockworks and small breccia zones filled by carbonate, heamatite and quartz demonstrating an epigenetic component to the mineralisation.

http://www.africaneagle.co.uk/downloads/AER-Prospectus-June-03.pdf - page 40

 

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