Location And Overview
The Yerrida South project comprises the Yerrida tenements that Great Western retained 100% ownership after the Sandfire Farm-In Agreement. The tenements are in the southern area of the Yerrida Basin where the Company believes the area is prospective for sedimentary hosted copper-cobalt-lead-zinc and VMS copper. The area includes the Chisel and Frustration Well prospects.
The Chisel Anomaly
This anomaly is located at the intersection of the Perseverance and Chisel faults. The Perseverance fault is a major discontinuity within the Yilgarn block that hosts many of WA’s largest nickel and gold deposits.
Geophysical modelling of GTE’s own regional gravity data anomaly identified an anomaly at the Chisel prospect that the Company believes favourable for either VMS, sedimentary hosted copper-cobalt, Sedimentary lead-zinc or intrusion related base and/or previous metals.
Great Western has reason to believe the Chisel gravity anomaly is an exciting base metal VMS prospect after identifying the following favourable signs:
- A discreet, gravity anomaly within favourable stratigraphy for massive sulphide base metal mineralisation.
- Located at the intersection of the primary Perseverance fault and the secondary Chisel fault (fig 1). The Perseverance fault may also be the primary control of the Degrussa and Monty deposits and it also hosts some of WA’s largest nickel and gold mines.
- Base metal anomalism in historical drilling along strike to the north and south (fig 3).
- Similar rock types to Degrussa and Monty.
- Pathfinder elements in RC drilling located along strike indicate four possible VMS horizons.
There is highly anomalous base metal mineralisation in historical drilling located to the north (2m @ 3.12% copper) and south (2m @ 85 g/t silver at EOH) of the target (fig 7).
More importantly, RC drilling completed by Great Western along strike to the northwest to test the anomalous historical copper RC result intersected strongly altered geological sequences similar to Degrussa.