Australia - Manindi Zinc
Figure 1 - Location of the Western Australian base metals projects
The Manindi zinc project is a significant base metal resource located in the Murchison District of Western Australia, 20 km southwest of the defunct Youanmi gold mine.
The project is located around 500 km northeast of Perth and is being explored with a view to expanding the existing resource and examining the project's copper potential.
The project has the potential to yield new copper and nickel mineralisation in addition to the existing zinc-copper resources at the project.
Work to date indicates the potential to locate Cu-Ni mineralisation in the ultramafic and gabbroic rocks contained in the Manindi sequence.
Metals has identified several untested geophysical anomalies adjacent to the known mineralisation at Manindi which constitute a number of attractive new drill targets for copper-zinc and copper-nickel mineralisation. Copper-rich VMS deposit discoveries such as Sandfire’s Doolgunna Project and Cu-Ni discoveries such as Sirius’ Nova deposit have been found utilising similar geophysical techniques in the recent past. Manindi is located within a known mineralised terrane with significant upside potential for further base metals discovery.
Recently the Geological database and mineral resource estimates were brought up to JORC 2012 standard. The new estimate is 1.08Mt at 6.52% Zn, 0.26% Cu and 3.19g/t Ag reported at a 2% Zn cut-off.
Manindi is considered to be an Archaean VMS (volcanogenic massive sulphide) deposit within the Murchison Province of the Yilgarn Craton. The deposit comprising a series of lenses of zinc-dominated mineralisation that have been folded, sheared, faulted, and possibly intruded by later dolerite and gabbro. The style of mineralisation is similar to other base metal sulphide deposits in the Yilgarn Craton, particularly Golden Grove near Yalgoo to the west of Manindi, and Teutonic Bore-Jaguar in the Eastern Goldfields.
Updates to and interrogation of the geological database, reinterpretation of 3D geological models, and a review of the deposit geostatistics have allowed the upgrading of the mineral resource estimate for Manindi to JORC 2012 standard. The new resource model is a significant improvement on the JORC 2004 resource model.
JORC 2012 mineral resource estimate 1.08Mt at 6.52% Zn, 0.26% Cu and 3.19g/t Ag reported at a 2% Zn cut-off.
Figure 2 – Long section view of the Warabi (left) and Mulgara (right) mineral resource block models looking south west
Figure 3 – Long section view of the Kowari (left) and Kultarr (right) mineral resource block models looking south west
Figure 4 - Drillholes by type over mapped geology and structure at Manindi
SIGNIFICANT HISTORIC DRILLING INTERSECTIONS
Drilling at Manindi to date has identified four zones of high grade zinc mineralisation. The four main zones from north to south are Kultarr, Kowari, Mulgara and Warabi.
A number of factors are believed to control the mineralisation at Manindi:
- The mineralisation occurs within multiple stratigraphic horizons, which extend discontinuously over a strike length of 4 km.
- The gabbro footwall does not appear to intrude and remove the mineralisation, but rather forms a ‘marker’ unit within the stratigraphy above which is potentially prospective for mineralisation.
The high tenor and significant thickness of the zinc mineralisation are important positive attributes of Manindi. The presence of intersections such as 52m* at 5.96% Zn and 0.25% Cu in FWD0053 from 137.60m and 10m* at 12.61% Zn and 0.42%Cu from 172.36m in MND005 in the northern Kultarr zone can be compared to intersections in the southern Warabi zone of 24m* at 11.41% and 0.33% Cu from 43m* in MNRC014 and 13.97m* at 11.61% Zn and 0.39% Cu from 38.70m in MND007. These mineralised areas are separated by 1.7km of strike which is poorly tested by drilling.
*Not indicative of true width due to holes being drilled at a low angle to the mineralised structure