Alcoa Active Bauxite Interests1As reported December 31, 2012
Qualifying statements relating to the table above:
Australia—Darling Range Mines: Huntly and Willowdale are the two active mines in the Darling Range of Western Australia. The mineral lease issued by the State of Western Australia to Alcoa is known as ML1SA and its term extends to 2045. The lease can be renewed beyond 2045. The declared reserves have been estimated to the end of December 2012. The amount of reserves reflect the total AWAC share. Additional resources are routinely upgraded by additional exploration and development drilling to reserve status. The Huntly and Willowdale mines supply bauxite to three local AWAC alumina refineries.
Brazil—Poços de Caldas: Declared reserves are as of the end of October 2012. Tonnage is total Alcoa share. Additional resources are being upgraded to reserves as needed.
Brazil—Juruti RN102, RN103, RN104: Declared reserves are as of November 1, 2012. Declared reserves are total AWAC share. Declared reserve tonnages and the annual production tonnage (estimate to the end of 2012) are washed product tonnages. The Juruti mine’s operating license is periodically renewed and the next renewal is in 2014.
Jamaica—Jamalco: Declared reserves are as of October 2012. The declared reserve and annual production tonnages are AWAC share only (55%). Declared reserves are in the following areas: Harmon’s Valley, South Manchester, North Manchester and Porus/Victoria. Current ore mining is in Harmon’s Valley and South Manchester with a small amount of ore from a test stockpile in North Manchester. The location has scheduled probable reserves from North Manchester and Porus/Victoria within the 2013-2016 period. Additional resources are in the process of being upgraded to reserves.
Suriname—Suralco—Caramacca: Caramacca has been removed from the reserves due to the expiration of the mining permits for this area. Some ore remains at Caramacca and the permit is awaiting renewal by the Government of Suriname so that the last ore can be recovered.
Suriname—Suralco—Coermotibo and Onverdacht: Declared reserves are as of October 1, 2012. AWAC owns 100%. Additional resources are being evaluated for upgrading to reserves.
Kingdom of Saudi Arabia—Al Ba’itha: Declared reserves are as of March 2011 and are for the South Zone of the Az Zabirah Bauxite Deposit. The reserve tonnage in this declaration is AWAC share only (25.1%). The Al Ba’itha Mine is due to begin production during 2014.
Brazil—Trombetas-MRN: Declared reserves are as of May 31, 2012. Declared and annual production tonnages reflect the total for Aluminío and AWAC shares (18.2%). Declared tonnages are washed product tonnages.
Guinea—Boké-CBG: Declared reserves are as of January 1, 2012. The declared reserves are based on export quality bauxite reserves. The AWAC share of CBG equates to 22.95%. Declared reserve tonnages are based on the AWAC share of CBG’s reserves. Annual production tonnage reported is based on AWAC’s 22.95% share. Declared reserves quality is reported based on total alumina (TAl2O3) and total silica (TSiO2) because CBG export bauxite is sold on this basis. Additional resources are being routinely drilled and modeled to upgrade to reserves as needed.