Mimbula 1 Pit (KCM Vedanta) - Zambian Copperbelt (sitios de interés)
Descripción del sitio
RESOURCE BASE
Inferred 25.30Mt at 1.16% Cu, 0.70% AsCu
January 2010 - Investorupdate
Opening of Mimbula Open Pit projected for FY2010
GEOLOGY
Deposit type: Footwall Quartzite Hosted Mineralisation (Type 1b)
Copper mineralisation is hosted by quartzite in the footwall of the OS1 Member at the Chingola ‘B’, Mwambashi ‘B’ (Mwambashi Copper Project), Chibuluma, Fitula and Mimbula mines. The host units are located in fault bounded sub-basins to which the overlying shale has acted as an impermeable barrier and reductant for mineralised fluids. It has been postulated that hydrocarbons trapped in the arenaceous footwall sediments may also have acted as reductants that have controlled precipitation of sulphide minerals from mineralised fluids. Whilst having smaller resources than the ore shale deposits, typically several tens of millions tonnes, the grades are generally higher at 2.5% to 4% Cu, with varying Co grades.
Copper mineralisation is hosted by quartzite in the footwall of the OS1 Member at the Chingola ‘B’, Mwambashi ‘B’ (Mwambashi Copper Project), Chibuluma, Fitula and Mimbula mines. The host units are located in fault bounded sub-basins to which the overlying shale has acted as an impermeable barrier and reductant for mineralised fluids. It has been postulated that hydrocarbons trapped in the arenaceous footwall sediments may also have acted as reductants that have controlled precipitation of sulphide minerals from mineralised fluids. Whilst having smaller resources than the ore shale deposits, typically several tens of millions tonnes, the grades are generally higher at 2.5% to 4% Cu, with varying Co grades.