The Serra Grande gold deposits are hosted in a typical greenstone belt sequence. The mineralisation is hosted by metasedimentary and metavolcanoclastic rocks, with quartz veins and massive or disseminated sulphides that have economic potential when controlled by geological structures. Two main deformational events control the mineralisation and have been identified in the region: - The first, a thrusting event (D1 from west to east), developed with irregular thrust ramp geometry. This event was responsible for stacking and inverting the stratigraphic sequences. - The second event (D2), was the thrusting of the Santa Terezinha sequence over the Crixás Greenstone Belt, folding the rocks (F2) and generating the structural controls for gold mineralisation, generally parallel to the fold axis. Deposit type The Serra Grande gold deposit is an orogenic mesothermal deposit, associated with the development of shear zones that belong to the Upper Archaean Crixás Group. Gold mineralisation is associated with metasediments and metavolcanics from the Ribeirão das Antas and Rio Vermelho Formations respectively. The Crixás Greenstone Belt is surrounded by granitic gneiss terrains from the Ribeirão das Antas and Caiamar complexes and metasedimentary rocks from the Santa Terezinha Group, which is part of the Goiás magmatic arc. Mineralisation style The mine is in the Crixás Greenstone Belt sequence, in the central portion of Brazil, and the main host rocks are metasedimentary sequences as ........

The Serra Grande operation comprises three underground mines, namely Mina III (including orebody IV, V, and Ingá), Mina Nova (including Pequizão orebody) and Mina Palmeiras. The open pits mine the outcrop of Mina III Inferior and Structure IV zones, and Pequizão. Three mining methods are used underground: sub- level stoping (bottom-up and top-down), cut and fill, and room and pillar. The open pits use standard drill and blast, followed by truck load and haul.

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