RECONNAISSANCE exploration at King River Copper’s Speewah Dome project in Western Australia has identified a different style of mineralization near the intersection of the Pentecost and Todhunter fault systems. Surface assays have returned very high copper values of up to 35% and high silver of up to 10 ounces per tonne.
This work was undertaken during phase one and two drill programs within Speewah Dome, including Calamondah, Greys-Catto, Eiffler East, Todhunter, Todhunter South, Pentecost River and Rogers Valley. It identified more quartz veins and breccias with malachite and chalcopyrite mineralization in outcrops and colluvium.
At Todhunter North near Pentecost River localized gossanous material was identified within a fault zone near the base of a northwest trending ridge. Samples have returned high copper and silver assays, with the best results up to 35% copper and 320 grams/tonne silver.
The phase two drilling indicated this fault zone was 10 to 15 metres thick and parallel to the Transform Fault corridor inferred to cross the Speewah Dome in this area. In addition, these surface samples contain high copper and silver, associated with significant iron. This combination has not been recorded elsewhere at Speewah without the association of significant lead and antimony. King River believes the intersection of this northwest fault zone with the north-south Todhunter fault to the east is a priority target for drilling.
A new outcropping gold mineralized vein has been identified 1.5km north of Greys and 2.5km south of Chapman. This discovery and phase two intersections of quartz veins support the potential for continuation of the Chapman and Greys north-south trending mineralized structures over a 5km strike mostly under the colluvial and alluvial cover that dominates the Greys-Chapman valley.
Also new copper mineralization has been found along the eastern flank of Speewah Dome south of Chapman. At the base of a high cliff strongly folded shale is found amongst extensive scree from the cliff, which suggests another north-south shear zone has shaped the eastern edge of the dome. The entire upper sequence of the dome would therefore be preserved to the east below the cliff and is a new exploration target.
Samples collected on slopes up to 500 metres north of the Calamondah outcrop and in outcrops 150 metres south show there is an 800 metre strike length of potential mineralized structures. Drilling has tested the thickness of this structure 150 metres north of the original outcrop. In addition, mineralization has been discovered 500 metres to the west of Calamondah as well as 1km to the northeast.
In the Sunset Flats area mineralization in brecciated veining has been identified close to the vanadium prospect.