Geology Lamego Lamego mine is located in the Iron Quadrangle, which is a geotectonic unit on the southern edge of the São Francisco Craton, comprising Archaean and Proterozoic terrains, and bordered by Neoproterozoic mobile belts. From a regional viewpoint, Lamego mine is located in the eastern extension of the Serra do Curral inverted homocline, located on the northern edge of the Iron Quadrangle. The mine lithostratigraphy consists of an intermediate metamafic sequence of the greenstone belt type and is hosted in the Nova Lima Group, which is part of the Rio das Velhas Supergroup. This sequence is characterised by lower metabasaltic rocks at the base, overlain by Algoma-type BIF metasediments, a quartz layer (known locally as metachert), carbonaceous schist, graphite schist and a further sequence of sediments consisting of alternating metapelites and metapsammitic rocks with a volcanoclastic contribution. The upper sequence of the Rio das Velhas Supergroup is the metasedimentary Maquiné Group. Cuiabá Cuiabá mine is located in the Iron Quadrangle, which is a geotectonic unit on the southern edge of the São Francisco Craton, comprising Archaean and Proterozoic terrains, and bordered by Neoproterozoic mobile belts. From a regional viewpoint, Cuiabá mine is located in the eastern extension of the Serra do Curral inverted homocline, located on the northeastern edge of the Iron Quadrangle. The mine lithostratigraphy consists of an intermediate metavolcanic sedimentary sequence ........

AGA Mineração encompasses mining operations at Cuiabá, Lamego and Corrego do Sitio (CdS).

Corrego do Sitio
Corrego do Sitio has been in operation since 1989 and consists of open pit and underground mines.

The underground mining method for CdS is sub-level stoping. Each panel consists of three levels with secondary development drives varying from 100m to 600m along strike. The stopes are around 15m high and the mining sequence method varies between top-down and bottom-up, which is only used in specific areas. Geotechnical parameters require that sill pillars are 4 to 7m high, and rib pillars 5m wide. The access into CdS I underground is by decline and into CdS II underground is by shaft.

The open pit operation uses conventional bench mining, with 8m individual benches and 3.2m berms. The material transport (ore and waste) is done by trucks and the excavation by a back hole. The rock breaking method varies according to the rock strength, using either explosives or mechanical excavation.

Cuiabá
Cuiabá mine is an underground gold mine. The mine currently operates using two main mining methods: sub- level long hole open stoping, and a variant of this method, locally called triple stoping. The cut and fill mining method is occasionally applied as a third mining method in areas where dip and grades of the mineralisation are lower. All underground production is hoisted to surface through a vertical shaft.

Cuiabá mine ........

Crushing:
There is a primary crushing inside the mine and after that the ore is sent to the surface crushing. Crushing is just a process to reduce size of ore rocks so that it can feed the Mill with a smaller size.

Milling:
Milling process is responsible to reduce ore size so that it assumes a powder size. After that the ore goes through gravimetric concentrators, so the free gold can be taken of the gold. However, approximately 85% of the gold is included in sulfur molecule and is necessary additional processes to recovery it. There is no cyanide solution adding at the milling process.

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