This report details our economic, social and environmental performance since becoming OZ Minerals (1 July 2008 to 31 December 2008). It also details the performance of Oxiana (1 January 2008 to 30 June 2008) and Zinifex (1 July 2007 to 30 June 2008) since each last published a sustainability report prior to the merger.

The report includes operations and exploration activities wholly owned and/or operated by OZ Minerals, Oxiana and Zinifex during this period. Our Group Office in Melbourne and support offices in Australia, Asia and other exploration locations are included in relation to employee data only. Information on the sustainability performance of our joint venture partners, companies in which we have equity interests, suppliers or contractors is not included.

Unless otherwise stated, all group and operational data includes:

• 18 months data for the Century and Rosebery operations
  
• 12 months data for the Golden Grove, Prominent Hill and Sepon operations, the Martabe and Canadian projects and exploration activities, and
  
• 6 months data for the Avebury operation.

For information prior to the scope of this report please see the Oxiana Sustainability Report 2007 (published March 2008), the Zinifex Sustainable Development Report 2006/07 (published November 2007) available at www.ozminerals.com.

Data collection, collation and presentation

Data collection, collation and presentation for this report was coordinated by the Group Office Sustainability team. Data was collected using a combination of interviews and workbooks based largely on the Global Reporting Initiative (GRI) G3 Indicator Protocols.

Data measurement techniques and the basis of calculations (including assumptions and estimation techniques) are aligned with the GRI G3 Indicator Protocols.

All financial data is for the calendar year 2008 and is reported in Australian dollars, based on an average exchange rate of A$1 = US$0.83 for 2008.

Where data collation or presentation does not align with the procedures identified above, this is stated.