West Wyalong

GCR's West Wyalong property is located over the township of the same name in central NSW some 430 kilometres west of Sydney. GCR owns the property 100%, subject to a 2.5% net smelter return royalty to Barrick.

A joint venture agreement has been negotiated with Argent Minerals Limited (AM) whereby they can earn 70% interest in the West Wyalong project by spending $1,030,000 by 2013. AM are planning to list on the ASX in early 2008.

Late in 2007 AM drilled three vertical RC holes in a wheatfield to test anomalous gold and copper geochemical anomalies and intersected what may be a previously umapped gold reef. The drilling was planned around an interpreted intrusive centre within a large (21 milligal) gravity anomaly. One hole, APG003, intersected 2m at 19.1 g/t gold from 106m downhole. Holes were also drilled under old workings on five gold reefs, looking for possible depth extensions. This strategy was successful at the Mallee Vale reef in the north of the property, with an intersection of 4m at 6.11 g/t gold from 28m. The Pine Ridge reef, in the west of the property, was also intersected, returning 2m at 1.48 g/t gold from 36m.

 

The West Wyalong gold field is hosted by the Ungarie Granite. Historic production of high grade gold was recorded at more than 440,000 ounces prior to 1920. In the period of peak mining activity from 1894 to 1907, 371,000 ounces of gold was produced with an average grade of 44 g/t. GCR focused its early work in this area and delineated a number of new zones, notably the Ken Glasson Zone immediately south of Wyalong.

The discoveries of the Cowal Deposit (in excess of 2.5 million ounces) 30 km to the north and Marsden (115 million tonnes at 0.4% copper and 0.15g/t gold) 20 kilometres to the northeast provided encouragement that large intrusion/volcanic-related hydrothermal systems existed in the area. This, in addition to the discoveries at Cadia, near Orange, and Northparkes, near Parkes showed that the Ordovician age magmatic arc complexes in NSW were highly prospective for copper and gold. Within the GCR tenement Geopeko had already delineated a sulphide-rich hydrothermal system at Narragudgil (mid 1980s) by testing magnetic anomalies beneath alluvial cover and further to the south Gold Mines Australia had also discovered the Mandamah porphyry complex in the mid-1990s.

The potential for the discovery of very large resources of copper and gold led GCR into a variety of geophysical and geochemical exploration programs which involved extensive aircore drilling to bedrock through transported cover which is commonly up to 40m thick.

GCR originally earned its 100% interest in the project by spending $1 million under an agreement with Lac Minerals. Barrick, through its various acquisitions now hold a 2.5% NSR royalty over the ground.

In 1999 Newcrest became involved in exploration on the eastern side of the tenement and undertook extensive drilling. At the Yiddah North Prospect Newcrest intersected copper and gold-bearing quartz-magnetite stockwork typical of porphyry systems. Mineralisation was weak and highly dismembered by late shearing and was encompassed and overprinted by broad zones of sericite-pyrite alteration thought to be of late metamorphic origin. No continuity could be established and Newcrest withdrew.

In 2002, MIM Exploration conducted extensive geophysical surveys using a proprietary system called MIMDAS. After drilling a number of holes, MIM was acquired by XStrata and the joint venture was terminated.

The exploration licence is host to a magnetic, magmatic complex of Ordovician age located at a major bend or buttressed zone on the Gilmore Suture. Geological and geophysical interpretations indicate three domains. These include the Gidginbung Volcanic domain comprising highly sheared andesitic rocks, the Gidginbung intrusive domain comprising a variety of dioritic intrusions with Gidginbung volcanic screens and the Bland Diorite domain where diorite bodies intrude basaltic volcanic rocks.

A recent review of geophysical and geological data has been completed. This entailed a review of geophysical data, especially the gravity data which showed a 21 mgal anomaly in the area of the Pines prospect on the western side of the tenement, and its relationship to elevated magnetics in the same area. This work was important because this is an area of poor outcrop and deep alluvial and saprolite cover. Geophysical modeling indicated the gravity anomaly was caused by a deep seated, dense, nonmagnetic body, probably a gabbro. This body is about 600m to the top. The magnetic features observed are shallow, near-surface responses and are located in rocks above the dense (gabbro) body and within the diorites and basalts of the Bland Domain.

Residual gravity shows a distinctive hole in the gravity high south east of the Pines, which is interpreted to be a body of less dense rock cross cutting the gabbro. This area is roughly circular and 3 km in diameter, named the "Intrusive centre". Interpreted together with all the compiled drill hole and bedrock geochemistry, a broadly concentric pattern is formed at the " Intrusive centre".

One of GCR's best gold intersections in aircore holes lies on the margin of this centre and returned 3m at 0.6g/t gold (WWAC239) near the bottom of the hole in highly altered kaolinitic material. A hole more than one kilometre east of this, which lies within the “centre” and on the flank of a small magnetic high, returned anomalous copper to 500ppm.

GCR conducted a programme of exploration to follow-up WWAC239 and other anomalous drilling. Four air core holes completed in September around the 1997 drill hole WWAC239 did not improve the original anomaly. Best result was 3m @ 0.32 g/ t Au from 22m in WWAC257 , located 100m due south of WWAC 239. Weakly elevated Cu (to 625ppmCu) was also noted.
January, 2008
 
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