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Sep 2009 - Catalpa Resources

Catalpa Resources Limited (CAH) –Bringing Edna May into Production at ~100,000ozpa from June 2010

  • Catalpa Resources (CAH) has started construction of their refurbished ~3mtpa ex-Big Bell plant that is expected to start production from June 2010 and ramp up to ~100,000ozpa production at cash costs of ~A$640/oz. The expected production is based on an initial throughput rate of 2.8mtpa that increases after ~2 years to 3.2mtpa, processing ore at a grade of ~1.2g/t with a ~92% recovery.
  • The host rock is the Edna May Gneiss which contains broad low grade gold mineralisation reminiscent of Kidston, Mt Leyshon or Mt Rawdon, except that it is enhanced by higher grades within the gneiss itself and by arcuate, high grade, generally laminated quartz veins, often containing visible gold and ranging at average values of up to ~1oz/t (30g/t) or so.
  • The production forecast does appear to be conservative as historical grade reconciliations were up to ~20% or so higher (due to the extensive often higher grade mineralisation) and historical recoveries appear to have been mostly in the 93% to 95% region in the harder sulphide rock. Catalpa are using a gravity circuit which increased recoveries in the 1980s, but was not used in the 1910’s or 1940’s.
  • Most of the previous production periods stopped producing at about the 1090m RL or 245m Level below surface due to a combination of water inflow and an extensive pegmatite unit, despite drilling showing that the mineralisation does continue with grade below this zone. Catalpa’s open-cut shell goes down to the ~1150m RL, with underground stoping a possibility at depth (not yet modelled).
  • CAH is in the process of undergoing a merger with its major shareholder Lion Selection Ltd (LST, 47% of CAH) that is expected to be completed in Nov/Dec 2009 and results in Catalpa owning 30% of the Cracow gold mine in QLD, and no major shareholder. The other Lion assets go into a separate Lion vehicle, with CAH receiving gold (less costs and capex) from Cracow from August 2009.
  • Written by: Keith Goode
  • Friday, 25 September 2009

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