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porgera gold processing autoclaves

The autoclaves operate at 1,725kPa pressure and 197C to oxidize the pyrite iron sulphide into hematite iron oxide producing feed for the CIL circuits which recovers up to 95 per cent of the contained gold. Lime used to neutralize the acid generated in the autoclaves is produced from limestone quarried from a quarry 15km from the mine.

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