Sepon Copper POXII Project

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Copper plant expansion

The Sepon Copper plant uses a patented copper leaching process comprised of crushing, acid grinding, acid flotation, pressure oxidation and a solvent extraction electrowinning circuit designed to produce 60 000 t/y of cathode copper. The POXII project scope included provision of a duplicate pressure oxidation facility, which formed part of an overall expansion of the plant to increase throughput to 80 000 t/y.

Ausenco’s scope was for the full EPCM of the project. This included EPCM US$40m for a duplicate autoclave facility; 1000m3 of concrete; 700t of structural steel fabricated in Thailand; 160t refractory lined steel autoclave fabricated in Finland and transported through Thailand and Laos to the mine site; complex titanium, monel and super duplex piping and valves; and peak construction workforce of 300 from diverse cultural backgrounds.

  • Project completed on time in a heated market in which human and material resources were in short supply
  • Commissioning and ramp up to full production achieved in two weeks
  • One month performance verification successfully completed following commissioning and ramp up.

Project details

Commodity
Copper
Location
Laos
Client
OZ Minerals (formerly Oxiana Ltd)
Timeframe
2005 - 2008
Solution phase
Create (EPCM)
Service
Program management