AngloGold Ashanti Córrego do Sítio Mineração
(AGA Mineração), which is wholly owned, comprises two operational units located in the state of Minas Gerais, close to the city of Belo Horizonte:
- The Cuiabá complex includes the Cuiabá and Lamego mines and the Cuiabá and Queiroz plant complexes. Cuiabá has been in operation for over 30 years while Lamego, an underground mine, has been in operation for seven years. The Cuiabá complex has changed from cut-and-fill to sub-level stoping, increasing the contribution from narrow vein ore bodies from 15% to 40% of the mine’s total production and improving rock engineering controls (support, design and monitoring). Ore from the Cuiabá and Lamego mines is processed at the Cuiabá gold plant. The concentrate produced is transported 15km by aerial ropeway to the Queiroz plant for processing and refining. Total annual capacity of the complete Cuiabá circuit is 1.75Mt. The Queiroz hydrometallurgical plant also produces around 200,000t of sulphuric acid as a by-product, which is sold commercially in local Brazilian markets.
- Córrego do Sítio, in operation since 1989, consists of one open-pit mine and one underground mine. The oxide ore mined is treated by heap leach and a pressure leaching plant treats sulphide ore. The sub-level stoping mining method is used underground. The distance from the main underground mine (Mina I) to the metallurgical plant is around 15km. Combined annual plant capacity is 1.6Mt.
Serra Grande, which is wholly owned, is located in central Brazil, in the state of Goiás, about 5km from the city of Crixás. It comprises three mechanised underground mines: Mina III, Mina Nova and Mina Palmeiras, and an open pit. One dedicated metallurgical plant, with an annual capacity of 1.5Mt, treats all ore mined.