Postive metallurgical results at Lennons Find

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THE DRILL SERGEANT: Perth-based exploration company Laconia has announced that it has returned positive results from preliminary metallurgical test work at its Lennons Find base and precious metals project in the eastern Pilbara region of Western Australia. 


The results come from a recently completed program of metallurgical leach testing on the oxide component of mineral resource at Lennons Find.

The results indicate that the oxide ore from the project is amenable to acid leaching for the extraction of copper and zinc, followed by cyanidation for extraction of Gold and Silver.

The leach recovery results to date suggest a potential two-stage heap leach treatment route for the oxide ore:

Stage 1 – Acid leach recovering the bulk of the copper and zinc,
Stage 2 – Cyanide leach to recover the bulk of the precious metals.

Results included;

  • Sulphuric Acid leach recovered 75 per cent of the copper and 87 per cent of the zinc
  • Subsequent cyanide leach recovered 87 per cent of the gold and 94 per cent of the silver
  • Oxide mineral resource is 197,000 tonnes at 89 grams per tonne silver, 0.37grams per tonne gold, 0.2 per cent copper, 1.2 per cent lead and 1.4 percent zinc in Indicated category.
  • Sulphide mineral resource is 1.65 million tonnes at  81g/t silver, 0.25g/t gold, 0.2 per cent copper, 1.5 per cent lead and 5.6 per cent zinc in Inferred category
  • Total mineral resource is 1.85Mt at 82g/t silver, 0.26g/t gold, 0.2 per cent copper, 1.4 per cent lead and 5.1 per cent zinc in combined indicated and inferred categories

 

 

Lennons Find project location map. Source: Company announcement

Future work will focus on column leach testing at coarser crush sizes, which will more closely represent the conditions expected in a small scale/low capital cost heap leach operation.

Laconia acquired a 95 per cent interest in the Lennons Find project from Jabiru Metals in March 2011.

Further drilling is planned at the Lennons Find project to test for additional resources at depth, at the Hammerhead deposit, and to target further oxide resources within the project area.