West Pilbara Project
The portfolio of tenements comprising the West Pilbara Project cover an area of more than 450km2. The project is prospective for gold, base metal, and iron mineralisation, and is in close proximity to Karratha, the economic hub of the West Pilbara.
Artemis is continuing to work to identify priority targets on this West Pilbara ground which hosts various under explored gold, base metal, and iron assets. These target areas include:
Munni Munni JV (PGE)
During 2015 Artemis acquired a 70% interest in the Munni Munni PGE Project. The Munni Munni project is located 55 kilometres south of Karratha, and comprises four granted mining leases.
The Munni Munni project contains a JORC(2004) total resource of 24 Mt @ 2.9 g/t (Pt+Pd+Au) for total contained metal of 0.83 Moz Pt, 1.14 Moz Pd, 152,000oz Au, and 76,000oz Rh (Table 1).
Table 1: Munni Munni Mineral Resource Estimate
Figure 1: Munni Munni Mineral Resource Estimate
The Munni Munni project is situated within the Archaean Pilbara Craton, and is hosted within the Munni Munni Igneous Complex (MMIC), a layered mafic-ultramafic package of predominantly gabbroic rock. Mineralisation is located within the Ferguson Reef, which occurs at the contact between the lower ultramafic rocks and the upper gabbroic rocks. The Ferguson Reef averages 2.6 metres in thickness, has a strike length of approximately 2 kilometres, and extends from surface to a depth of more than 1 kilometre.
Figure 2: Munni Munni Representative Cross Section
The eastern side of the Munni Munni intrusion remains unexplored, with potential for extensions to the Ferguson Reef to be found to add to the current resource.
Carlow Castle (Au-Cu)
The Carlow Castle Project is located 10 kilometres south-west of Roebourne, and hosts a JORC(2012) Inferred Mineral Resource of 418,000 tonnes at 3.0 g/t Au and 0.6% Cu, for total contained metal of 40,000 ounces of Au and 2,500 tonnes of Cu. Gold and copper mineralisation is hosted by a series of stacked steeply dipping quartz veins within a broader shear zone.
A number of other mineralised structures are present within the Carlow Castle Project area, including the Little Fortune and Good Luck prospects located immediately south of Carlow Castle. Artemis completed initial drill testing of these structures, which was successful in identifying mineralised sulphide zones containing chalcopyrite and pyrrhotite. Best intersections from this drilling were:
- 9m @ 2.7% Cu & 16.3 g/t Ag (LFRC002; 67-76m)
- 3m @ 2.16% Cu, 1.22 g/t Au, and 16.1 g/t Ag (LFRC001; 160-163m)
- 4m @ 0.42% Cu (GLRC001; 103-107m)
The positive results from the completed drilling indicate the potential to add to the current Carlow Castle Mineral Resource through further exploration, including downhole electromagnetics (EM) to assist with designing further exploration drilling.
Figure 3: Little Fortune Drillholes and Best Intersections – 2015 RC Drilling
During 2014 Artemis acquired the Weerianna Gold Project, located 5 kilometres west of Roebourne, and within 7 kilometres of the Carlow Castle Project.
The Weerianna Gold Project hosts a JORC(2012) compliant Inferred Mineral Resource of 1Mt at 2.2 g/t Au for total contained metal of 70,000 ounces of Au. The current resource remains open at depth and along strike.
Gold mineralisation at Weerianna is associated with quartz veining within chlorite-serpentinite schists, with variable degrees of silicification and carbonate alteration.
Figure 4: Weerianna Cross Section
Nickol River (Au)
The Nickol River Project has reported historical gold production from four main areas comprising Tozer’s, Boiler, Nickol South and Lydia. These prospects are located between 15 and 20 kilometres south-east of Karratha. Gold mineralisation occurs over a strike length of 5 kilometres, associated with quartz and quartz stockwork within ultramafic schists. Historic drilling at Nickol River identified intersections of up to 4m @ 9.70 g/t Au (NR16), and 3m @ 34.5 g/t Au (MRC13). There remains considerable potential for discovery of additional gold mineralisation both at depth and along strike of the shallow workings in the Nickol River area.
Artemis have completed compilation of available historic data and currently have Programme of Work approval to complete a series of trenches throughout the area to better define gold mineralisation to guide drillhole planning.
Figure 5: Nickol River – Lode Zones and Geochemical Compilation
Silica Hills (Au)
The Silica Hills Project is located 25 kilometres south-east of Karratha, and has historically been an area of alluvial gold production. Historic exploration in the area has reported gold in rock chip samples of up to 175 g/t Au. Only limited historic drilling has been completed, with a best intersection of 1m @ 5.3 g/t Au.
Recent costeaning completed by Artemis at Silica Hills was successful in exposing significant free gold within multiple stockwork systems within Archaean felsic and mafic rocks. Recent samples taken from this area returned up to 29.8 g/t Au. Extensive rock chip and channel sampling is underway to better define this gold mineralisation, and allow further exploration drilling to be designed.
Similar host units have been identified over a strike length of approximately 2.8 kilometres. Artemis has recently expanded its interest in this area, by acquiring all shares in Shear Zone Mining Pty Ltd, a company that holds 34 of 100 shares in mining leases covering a portion of this strike length contiguous with the area held by Artemis.
Figure 6: Silica Hills Geochemistry
Purdy’s Reward (Au)
Recent exploration by Artemis at the Purdy’s Reward prospect, 35 kilometres southeast of Karratha has identified significant free gold hosted in mafic rock. Free gold has been confirmed over an 800m strike length, over widths of up to 100m. Recent assay results from this area returned up to 35.6 g/t Au.
Only limited historic exploration has been completed in the area, with Westfield Minerals NL completing RC drilling immediately west of the identified gold mineralisation during 1971. These drillholes were not analysed for gold, but returned up to 1260ppm Ni associated with chloritized and mafic basalt.
A Programme of Work application has been lodged to gain approval for a programme of trenching and RAB drilling designed to better delineate the size and tenor of the identified gold mineralisation.
Figure 7: Coarse Gold Nuggets from Purdy’s Reward