Our newest gold discoveries are Monarch and Conqueror, as discovered using geochem and awaiting a drilling program.
The main non-conglomerate gold exploration targets in Artemis’ West Pilbara tenements are at Monarch and Conqueror, identified as significant soil geochemical gold anomalies during a regional geochemical survey carried out by Artemis in 2018. A regional HeliSAM survey is planned covering most of the tenements including these main targets.
Location of Monarch and Conqueror prospects, relative to the Radio Hill plant
Monarch is an entirely new area of gold in soil anomalism (to 68 ppb Au) and mineralisation. The soil geochemistry shows a continuous anomaly >95th percentile over 4.5 km with an additional 1.7 km to the west after a discontinuity.
Geological mapping shows the area to be within a wide zone of sheared talcose and cherty schists with multiple strike parallel quartz veins. Rock chip sampling returned values up to 11.4 g/t Au. A discontinuous traverse of 20 rock chip samples over a width of 250m showed 9 samples with responses >1g/t Au to a maximum of 9.89 g/t Au.
Most samples were from quartz veins, but three samples were within gossanous chert, cherty gossan or chert with gossanous lenses which contained 1.41 g/t, 1.32 g/t and 2.41 g/t Au respectively. Of note is that many samples show a silver to gold ratio >10:1 possibly indicative of sulphide mineralisation.
Monarch Central Target with gold in soil and rock chip values over 4.5km strike
The Monarch target is just less than 7km long with rock chip sample grades up to 11 g/t Au. The soil geochemistry suggests the system could be significantly longer. Initial aircore drilling will be used to precisely locate mineralization at depth to be followed by RC drilling to delimit any resources. Statutory Program of Works (POW) approval for the proposed aircore drilling has been granted but a heritage survey and its approval is required before proceeding.
Monarch exploration targets
Conqueror is located to the north of the Ruth Well Ni-Cu mineralisation. A discontinuous gold in soil anomaly to a maximum 146ppb Au is traceable for 14 km, apparently relating to a prominent chert ridge and outcrop. To date geological mapping and sampling has had limited success with only one significant sample of silicified laminated sediment containing 5.04g/t Au.
Historic Rotary Air blast (RAB) drilling 5.5km to the east of the main anomalous area along the siliceous laminated chert horizon returned one sample of 0.5 g/t Au over 1 m.
Conqueror Central target with gold in soil values and significant rock chips
Soil sampling and rock chip sampling have defined a shear zone system containing anomalous gold up to 5 g/t Au at Conqueror. Artemis geologists interpret that this system could be over 40 km long.
An extensive aircore drilling program is planned in the central area of Ruth Well where geochemical anomalism appears strongest with coincident anomalous Ag and Cu soil responses. This drilling will be followed by RC drilling to test any mineralisation located by the Aircore drilling. POW approval for the proposed aircore drilling has been granted but a heritage survey and its approval is required before proceeding.
Conqueror exploration targets
Other gold projects
Besides exploring for conglomerate hosted gold at Purdy’s Reward – Comet Well under the Novo JV, Artemis is exploring for other styles of gold in its other West Pilbara tenements. The West Pilbara has a long history of small-scale gold production predominantly from quartz vein related systems.
Artemis noted the presence of shear zone hosted gold at Nickol River feeding the alluvial/eluvial systems in the area and the axial plane quartz-gold-arsenopyrite mineralisation at the Weerianna Au Project along with the multiple other known gold sources within the greenstones. After consideration of this information, geochemical exploration was initiated in the Carlow Castle area where Artemis has confirmed with drilling a Au-Cu-Ni JORC Code (2012) resource.
Based on the Carlow Castle success, sampling was subsequently expanded to cover virtually all Artemis’ tenure.
Artemis took soil samples 100 m apart along 400 m spaced lines aligned north-south. A total of 12,247 samples have been collected and analysed for a suite of elements.
All data presented below has been domained based on the GSWA 1:100,000 geological mapping, then ratioed using the 25th percentiles of the data. Data was contoured using Surfer software using Inverse distance squared (ID2) and the search ellipse long axis orientated to 80° east of north, contouring/plotting colours are then based on the 99th, 97.5th, 95th, 90th and 75th percentiles of the ratioed values.
The specific purpose of this processing was to highlight the anomalous samples and to minimise the lithological effects/contents of the differing underlying geological sequences.
All the main areas identified in the geochemistry show multi-element responses as summarized below:
- Carlow Castle - Au, Ag, Co, Cu, Ni, Hg, Mo, Se, Te, Pd, Zn
- Monarch - Au, Ag, As, Mo, Ni, Sb, Se, Te, W
- Conqueror Au, Ag, Hg, Mo, Sb, W
- Pipeline - Au, Ag, As, Co, Mo, Se, Tl
- Silica Hills - Au, Ag, Bi, Mo, Sb
- Nickol River - Au, Ag, Hg, Mo, Se, Tl
Soil sampling location and areas with Au related targets identified
Targets identified or highlighted by regional gold geochemistry
The Pipeline prospect is located to the south east of Radio Hill. Soil geochemistry and metal detected nuggets with a Minelab GPZ 7000 identified two parallel trends approximately 1km apart coincident with aeromagnetic trends. The aeromagnetic trends are interpreted to represent shear zones along the southern contact of the small Yannery Granite intrusion.
Outcrop in the area is subdued with metal detected nuggets being small angular fragments near quartz vein outcrops or scree, and are interpreted to represent the shear zones.