Redstone Resources Limited (ASX: RDS) has established new areas of copper prospectivity at its West Musgrave Project in Western Australia.
The promising targets were identified by a recently completed project scale geological mapping programme at West Musgrave with final assay results from surface rock chip samples returning up to 0.71% copper.
Combined with the recent 95m downhole thick zone of anomalous copper sulphide mineralisation intersected in reverse circulation (RC) drill hole TLC170 at the EM5 target area, the recently completed field programme has brought attention to the potential for significant additionalcopper mineralisation outside of the known Tollu copper vein system.
The geological mapping field programme was undertaken in late 2019 and covered an area of approximately 135 square kilometres. The mapping focused on a region that encompassed the major Tollu Fault from the southern to northern property boundaries, west to cover the EM1 target area and northeast through EM5 to the EM6 target area.
Where basement geology or quartz veins were found outcropping at the surface representative rock chip samples were collected for examination and analysis back in Perth. A limited number of these rock chip samples were sent to the laboratory for whole rock geochemical analysis.
The company has identified four new target areas:
At Target 1 a copper concentration of 0.71% was found in a sample collected from a large quartz outcrop some 15m long and 2m wide approximately 2.3km northeast of Tollu. The quartz vein was striking N‐W and contained visible enclaves of secondary copper mineralisation (malachite) and sulphides.
At Target 2 Copper a concentration of 0.12% was found in a sample of opaline quartz lag, 3.6km north of Tollu and coincident with the Tollu Fault. The opaline quartz lag was found over an area aligned E‐W and extended for approximately 1km. It tended to follow, enveloping a continuously outcropping quartz vein which extended for some 700m, along an E‐W strike. In the east the opaline lag could be found over a N‐S ‘width’ of some 1.3m.
At Target 3 samples in a gabbro outcrop with 0.044% copper and a nearby outcropping quartz vein striking N‐W with 0.037% copper highlight the prospectivity of the South Tollu target area for further copper mineralisation.
At Target 4 visible secondary copper (malachite) was identified in large NW trending quartz veins in an exposed hill within the EM6 target area, some 10km N‐E of Tollu.
As a result of the 2019 drilling two other EM5 ‘look‐a‐like’ magnetic anomalies have been upgraded to targets for future exploration.