today i rang 08 9321 6600, page-34

4. To satisfy Xstrata?s back-in criteria and to realise 80,000 tonnes of copper metal per year for 8 years, as an example (assuming a typical Carajas copper run-ofmine
head grade of 0.75%Cu and metallurgical process recovery of 90%) around 100 million tonnes of ore would need to be available for extraction. Of this 100million tonnes, ownership of a minimum of 30 million tonnes of ore (or 24,000tpa of copper metal production) would be retained by Avanco.

50MT @ 1% is a lot! Would give over around $1 Billion NPV.