Description
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AMIS0417 Cu 3.845% Co 5344ppm Oxide Tenke DRC
Origin of Material: AMIS0417 is a commissioned CRM made out of Cobalt-Copper oxide ore from the Tenke Fungurume (Tenke) mine operated by Freeport- McMoRan Copper & Gold Inc. The mine is situated in Katanga Province of the Democratic Republic of Congo 175km northwest of the regional capital Lubumbashi.
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 any variations 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 Fus 5344 ± 275 ppm
Co M/ICP 5242 ± 416 ppm
Co P 5203 ± 321 ppm
Cu Fus 3.845 ± 0.204 %
Cu M/ICP 3.820 ± 0.178 %
Cu P 3.770 ± 0.186 %
Cu 3 Acid ppm 3.711 ± 0.240 %
Specific Gravity 2.83 ± 0.08
