ore reserves and mineral resources 2011 report - Anglo American ...

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SECURING OUR FUTURE ORE RESERVES AND MINERAL RESOURCES Platreef (open-pit operations) Together with the application of modifying factors, the pit design determines the economic pit shell. Scheduling within the economic pit shell according to the relevant mines’ production requirements defines the Scheduled Reserves. The Scheduled Reserves are peer-reviewed and signed off by the competent person(s). The 2011 Ore Reserve has been estimated using pit designs derived from the 2010 Mineral Resource. Mining studies are in progress to identify the optimal pit design. Rock dumps (surface sources) Bulk samples taken on historical surface rock dumps have demonstrated the intermittent presence of low-grade reef material. This stems from historical haulage development on PGM-bearing markers such as the Pseudo Reef 1, and from suboptimal orehandling processes used in the past. Owing to the difficulty of effectively evaluating large-scale rock dumps, surface rock dumps across operations are not reported under the Ore Reserve and Mineral Resource estimates. Instead, they are considered as Mineral Deposits. However, rock dumps that have indicated potential are further sampled and evaluated on a localised basis for processing as a part of surface sources material where concentrator capacity is available. During 2011, this occurred at Union, Tumela, Khomanani and Siphumelele mines. A register of all competent persons has been lodged with the Company secretary. The head of Mineral Resource Management confirms that the Mineral Resources and Ore Reserves information in this report is published in the form and context in which it was intended. EXTERNAL REVIEWS In compliance with an internal three-year external review-and-audit schedule, Snowden Mining Industry Consultants (SMIC) were contracted to conduct the following: A detailed process review of the Mineral Resource and Reserve generations at the Khomanani, Tumela and Union mines. An assessment of the remedial actions put in place as a consequence of the 2010 process review at the Bathopele, Siphumelele, Thembelani, Dishaba and Mogalakwena mines. A detailed numerical audit of data gathering, evaluation and of the reporting of Mineral Resources and Ore Reserves at the Tumela, Union and Mogalakwena mines. Snowden states in their evaluation summary: “In Snowden’s opinion APL has estimated Resources and Reserves for the Union, Tumela, Mogalakwena and Khomanani operations in accordance with the definitions and guidelines contained in the SAMREC Code. The processes employed by APL for Mineral Resource and Mineral Reserve estimation are well aligned with industry practice. Snowden did not identify any material errors during the numbers audit of the Union, Tumela and Mogalakwena operations.” COMPETENCE AND RESPONSIBILITY In accordance with the Listings Requirements of the JSE Limited, Amplats prepared its Mineral Resource and Ore Reserve statements for all operations with reference to the 2007 guidelines and definitions of the South African Mineral Resource Committee (SAMREC). Competent persons have been appointed and assume responsibility for the Mineral Resource and Ore Reserve statements for all our operations and projects, as required. Gordon Smith (Pr Eng, PhD, MBA, MSc (Eng), BSc (Eng)) Engineering Council of SA (930124) Head: Mineral Resource Management Anglo American Platinum Limited Johannesburg 9 February 2012 12 ANGLO AMERICAN PLATINUM LIMITED 2011
Securing our future ANGLO AMERICAN PLATINUM LIMITED 2011 13
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ore reserves and mineral resources 2011 report - Anglo American ...

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