The Kolwezi Tailings Project is situated in the province of Katanga in the Democratic Republic of Congo (DRC), 25 km outside the town of Kolwezi.
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Kolwezi Tailings is a world-class cobalt and copper project that ranks amongst the world's largest resources of primary cobalt and a substantial resource of copper.
The Kolwezi cobalt-copper tailings project is based on the reclamation and treatment of stockpiled flotation tailings, which were produced by the mineral concentrator facility in Kolwezi, which processed high-grade ore from the Kov and other nearby mines from 1952 onwards. Due to the poor recoveries obtained from conventional concentrating techniques, valuable amounts of copper and cobalt were discharged into two tailings dams, referred to as Kingamyambo and Musonoi.
MineNet Consulting Mining Engineers of South Africa ("MineNet") were commissioned by Adastra to carry out geological and mining studies and provided supervision and quality assurance for the site investigation program. A drilling and sampling campaign was carried out between May and August 1997 and a sample library was established. A second campaign of density measurements was conducted during October 1997.
The resource estimate as calculated by MineNet in the preliminary work on the Kolwezi Tailings and as audited by Dr. Isobel Clark of Geostokos Limited, is 112.8 million tonnes of ore at an average grade of 0.32% cobalt and 1.49% copper. The cut off grade for these estimates was zero. Some 97% of these resources are in the measured category, the balance being in the indicated resource category. This geological resource has been estimated in accordance with the Canadian Institute of Mining and Metallurgy guidelines, which are different from the guidelines set forth in Guide 7 under Item 802 of Regulations S-K. Dr. Clark is a qualified person within the meaning of Canadian National Instrument 43-101.
Kingamyambo is a conventional dam that contains some 42.3 million tonnes of tailings and towers 20 metres high.
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