Yagahong Project
Syn-tectonic (epigenetic) Cu-Au mineralisation
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Yagahong is located 35km southeast of Meekatharra and approximately 20km north-east of Quinns. The tenement area comprises 160km2 and contains part of the Gabanintha shear system, a zone that is about 1km in width and hosts at least two zones of copper-gold mineralisation.
In the Yagahong project, Silver Swan has concentrated most of its activities at Copper Hills, a prospect that lies within the southeastern portion of the project area and incorporates a number of small historical workings. Only limited historic reverse circulation and diamond drilling has been carried out along this zone of workings.
The company has mapped the geology of Copper Hills in detail. A recent phase of drilling in 2010 has concluded the presence of multiple zones of shear-hosted copper-gold mineralization, including Lady Alma which lies to the east of Copper Hills. The shear zones occur within an ultramafic-mafic layered igneous complex within peridotite, pyroxenites and gabbroic host rocks.
The style of mineralisation is syn-tectonic and is potentially similar to deposits in the Chibougamau area (Canada) where 14 deposits have produced more than 39.5 million tonnes at an average grade of 1.57% Cu and 1.95 g/t Au.
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Copper Hills / Lady Alma
SWN has completed a total of 13 reverse circulation and 3 diamond drillholes into the Copper Hills and Lady Alma prospects at Yagahong. This represents the first phase of drilling in the Yagahong Project area. Most drillholes contain elevated copper-gold mineralisation signifying extensive alteration and metal in the area.
Mineralisation at Copper Hills is quartz vein-hosted copper-gold within a northwest-trending, 3km long zone of sheared dolerite and gabbro. At Lady Alma copper-gold mineralisation comprises sulphides hosted in sheared dolerites.
Latest results show significant copper and gold intersections in the Copper Hills/Lady Alma areas. There are also several VTEM (airborne electromagnetic) conductors, potentially related to magmatic sulphides in the Lady Alma area that will require testing.
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Geological map of the Copper Hills / Lady Alma area showing the location of recent drilling and a summary of results.
Photomicrographs of copper mineralization at Copper Hills / Lady Alma
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Chalcocite and covellite replacing chalcopyrite (copper mineralisation)
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Chrome spinel rimming and replacing magnetite