Project Descrption

Trundle (EL8222) is located 25km west of the Northparkes copper-gold mine (Rio Tinto). It has many similarities to Northparkes and is separated from the Northparkes district by a north-south trending Devonian rift basin. Interpretation of geophysical data suggests that Trundle may have originally been part of the Northparkes complex, which was subsequently dismembered during development of the rift. Recent work focussed at the Trundle Park and Mordialloc prospects.

At Trundle Park, a 3D IP survey was completed and several diamond holes drilled by previous explorers were re-logged which defined several shallow gold-copper skarn drill targets. Previous intercepts from the prospect include:

  • 11m @ 1.2g/t Au & 0.36% Cu from 3m;
  • 25.45m @ 0.71g/t Au from 14.85m; and
  • 35m @ 0.59g/t Au & 0.25% Cu from 12m.

The skarn is magnetite-rich, so it forms a prominent magnetic anomaly and the skarn horizon can be traced on ground magnetic imagery over a 2.2km strike length and is poorly drill tested. The style of mineralisation is similar to the Big Cadia skarn that is associated with the giant Cadia Valley porphyry deposits. The skarn at Cadia produced about 140,000 tonnes of copper at a grade of 5-7% Cu and over 1.5Mt of iron ore before the discovery of the massive Cadia Valley porphyry deposits. The Big Cadia skarn is the distal part of the Cadia hydrothermal system and forms part of the current resource and it was mined for decades before the porphyry deposits were discovered.

Drilling by Clancy confirmed the presence of shallow gold and copper skarn mineralisation. Ten RC holes (1239m) were drilled to test the gold-copper targets at Trundle Park in January 2011, returning:

  • TPRC003: 56m @ 0.88g/t Au, 0.35% Cu, 3.74g/t Ag from 34m, including
    • 2m @ 20g/t Au, 6.97% Cu, 81g/t Ag from 64m
  • TPRC005: 58m @ 0.44g/t Au, 0.17% Cu from 22m, including
    • 4m @ 1.19g/t Au, 0.41% Cu from 28m
    • 58m @ 0.44g/t Au, 0.17% Cu from 22m,
    • 4m @ 1.06g/t Au, 0.36% Cu from 70m
  • TPRC009: 52m @ 0.45g/t Au from 32m, including
    • 6m@ 0.99g/t Au from 52m
    • 2m @ 0.99g/t Au from 64m

The high grade gold, copper and silver mineralisation in TPRC003 is associated with quartz veining and native copper. The high grade interval is 75m south of historic workings last operated in the 1930’s (production unknown) and is interpreted to be representative of what was mined previously, the implication being that this mineralisation is consistent for at least 75m along strike and is open to the north, south and at depth.
Hole TPRC009 is 50m north of the previously reported intersection in CHEP-1 of 25.45m @ 0.71g/t Au from 14.85m. The mineralisation is not skarn related and the trace element geochemistry suggests the gold is epithermal in style and strong sericite and pyrite alteration supports this interpretation.

Drilling in early 2012 testing for iron content in the skarn did not return significant results. However, TPRC022 at the Trundle Park prospect intersected significant silver and base metal mineralisation consisting of 1m @ 284 g/t Ag, 2.54% Pb and 0.68% Zn from 30m. Further drilling is planned for Trundle Park to follow up the anomalous results mentioned above.

At Trundle Park previous drilling has shown that there is also potential for porphyry copper-gold mineralisation at depth. 

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