Mwambashi 'B' (Vale/ARM) - Zambian Copperbelt (sitios de interés)
Descripción del sitio
AREA
RESOURCE BASE
Measured 6.80Mt at 2.84% Cu, 1.3% AsCu & 0.05% Co
Indicated 1.90Mt at 2.35% Cu, 0.7% AsCu & 0.03% Co
Accessible by Open pit: 3Mt at 2.82%, 2.06% AsCu
Total at 1% Total Cu Cutoff: 8.70Mt at 2.73% Cu, 1.17% AsCu & 0.05% Co
Total at 0.5% Total Cu Cutoff: 11Mt at 2.03% Cu
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.
HISTORICAL RESOURCE BASE
Samba 14Mt at 1.10% Cu (1988)
Mwambashi A 0.4Mt at 1.68% Cu (1988)
Mwambashi A 0.7Mt at 1.70% Cu (1991)
Mwambashi A 7.06Mt at 1.58% Cu (1997)
Mwambashi ‘B’ O/P 3.00Mt at 2.82% Cu (2001)
Mwambashi ‘B’ U/G 4.46Mt at 2.67% Cu (2001)
Pitanda 15Mt at 1.70% Cu (1988)
Mwambashi A 0.4Mt at 1.68% Cu (1988)
Mwambashi A 0.7Mt at 1.70% Cu (1991)
Mwambashi A 7.06Mt at 1.58% Cu (1997)
Mwambashi ‘B’ O/P 3.00Mt at 2.82% Cu (2001)
Mwambashi ‘B’ U/G 4.46Mt at 2.67% Cu (2001)
Pitanda 15Mt at 1.70% Cu (1988)
Technical Report on Sedar dated October 21, 2005 (2216K)