AGA Mineração comprises two operational units, namely the Cuiabá and the Córrego do Sítio complexes. The Cuiabá complex includes the Cuiabá and Lamego mines and the Cuiabá and Queiroz plants. In operation for 26 years, the Cuiabá mine is principally a cut-and-fill mine accessed by ramp and shaft. Lamego is a new underground mine that exploits sulphide ore. Ore from the Cuiabá and Lamego mines is processed in the gold plant at the Cuiabá complex. The concentrate produced here is then transported 15km by aerial ropeway to the Queiroz plant where milling, flotation, roasting, leaching, precipitation and refining occur. Total capacity of the complete circuit is 1.65Mt/year and recoveries of 93% are achieved.
The Córrego do Sítio operation comprises one surface (oxide) and two underground (sulphide) mines, as well as a heap leach pad and sulphide plant. The latter, originally acquired from Eldorado late in 2008, has been refurbished.
Serra Grande is located in central Brazil, in the state of Goiás, about 5km from the city of Crixás. Serra Grande comprises three mechanised underground mines: Mina III, Mina Nova (which includes the Pequizão orebody) and Palmeiras – and an open pit on the outcrop of the Mina III orebody. One dedicated metallurgical plant treats all ore mined here. Annual capacity of the processing circuit, which has grinding, leaching, filtration, precipitation and smelting facilities, is 1.15Mt.
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