The gold mineralisation at Lamego is characterised by orebodies associated with two horizons of chemical sedimentary rocks: BIF and metachert (MCH), and also with shear zones containing abundant quartz veinlets. The proportions of these lithotypes vary substantially from one deposit to another. In the BIF, sulphide mineralisation is associated with gold, while in the MCH and quartz veins, the gold occurs either as native gold or in sulphides. Lamego shows similar rock assemblage, but with higher structural complexity than Cuiabá. The BIF which contains the mineralisation is more structurally deformed and is sometimes described as a ‘metachert’.

The mineralisation is characterised by sulphidation in the form of disseminated sulphide bands or as fracture filling and, more rarely, as massive sulphide hosted in BIF/MCH. Sulphide bands are rare in MCH. The plunge of the mineralised zones coincides with both the fold axis of the first two structural events and the mineral stretching.

The Arco da Velha deposit is located on the eastern side of a large fold and extends for 250m along the strike. In the north-eastern portion, the mineralisation is concentrated in the MCH, while in the south-western portion it is concentrated in the BIF. Carbonaceous phyllite and chlorite-sericite schists occur in the hangingwall contact, while hydrothermally-altered meta-andesite occurs in the footwall. The Cabeça de Pedra deposit is located in the hinge region of the large Lameg ........

The Lamego Mine is an underground operation located to the east of Belo Horizonte, in the southeast of Brazil.

Lamego started operating as a cut and fill mine and migrated to long hole stoping, nowadays all ore extracted from sub-level stopes. The ore extracted is transported to surface by diesel trucks and undergoes primary crushing at site. Crushed material is then transported by road trucks to the Cuiabá plant facilities to be treated. Waste mined is disposed at waste dumps and is also used to backfill stopes.

Lamego operates as a satellite mine to Cuiabá Mine. Ore is transported to surface via ramps where it is crushed, stockpiled and transported daily to Cuiabá Plant, where it is blended with Cuiabá ore on the ROM pad.

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