Description
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Mineral and Chemical Composition: The Tenke-Fungurume deposits are sedimentary copper deposits located in the Lufilian arc, an 800 km fold belt formed between the Angolan Plate to the southeast and Congo Plate to the northwest during the late Neoproterozic approximately 650 to 600 million years before present (Ma). Copper mineralization at Tenke-Fungurume is stratabound and generally restricted to two dolomitic shale horizons (RSF and SDB respectively) each ranging in thickness from 5 to 15 m, separated by 20 m of cellular silicified dolomite (RSC).
The main economic minerals present at Tenke and Fungurume are malachite, chrysocolla, bornite, and hetrogenite; the primary copper and cobalt mineralogy is predominately chalcocite (Cu2S), digenite (Cu9S5) bornite (Cu5FeS4), and carrollite (CuCo2S4); however oxidation has resulted in widespread alteration producing malachite (Cu2CO3(OH)2), pseudomalachite (Cu5(PO4)2(OH)4), chrysocolla (hydrated copper silicate) and heterogenite (Co3+O(OH)).
The primary copper-cobalt mineral associations are homogeneous in both mineralized zones and anyvariations are due to the effect of oxidation and supergene enrichment. Consequently the mineral assemblages can be grouped into three main categories dependent upon the degree of alteration – oxide, mixed and sulfide zone. Dolomite and quartz are the main gangue minerals present. Dolomite or dolomitic rocks make up the bulk of the host strata. Weathering of the host rocks is normally depth related, intensity decreasing with increasing depth, producing hydrated iron oxides and silica at the expense of dolomite, which is leached and removed.
For a detailed description please refer to the Technical Report prepared for Tenke Mining Corp by GRD Minproc Limited available at:
http://www.lundinmining.com/i/pdf/TenkeFungurumeFeasibilityStudy.pdf
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Co F 2126 ± 136 ppm
Co M/ICP 2132 ± 132 ppm
Co P 2095 ± 140 ppm
Cu F 1.151 ± 0.072 %
Cu M/ICP 1.151 ± 0.049 %
Cu P 1.141 ± 0.032 %
Specific Gravity 2.73 ± 0.06
