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Brazil
Lamego Mine (AGA Mineracao Operation)

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 Location:
15 km E from Belo Horizonte, Brazil

  Regional Office:
Faz. São Bento S/Nº
Santa Barbara
Brazil
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Fax(31)-3837-7188
WebsiteWeb
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  • Overview
  • Owners
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Cut & Fill
  • Longhole open stoping
Processing
  • Gravity separation
  • Calcining
  • Flotation
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Merrill–Crowe
  • Cyanide (reagent)
  • Roasting


Owners & OPERATOR

 
CompanyInterestOwnership
AngloGold Ashanti Ltd. 100 % Indirect
Anglogold Ashanti Corrego Do Sítio Mineracao SA. (operator) 100 % Direct

Deposit Type

  • Vein / narrow vein
  • Banded iron formation


Summary:

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 Lamego structure. The area which has shown the best economic potential contains BIF and MCH (80% of the area consists of BIF and the remaining 20% is MCH). The presence of faulting makes the stratigraphy complex in some areas. The carbonaceous phillite and clorite/sericite schists normally occur in the hangingwall and meta-andesites in the footwall.


Mining Methods

  • Cut & Fill
  • Longhole open stoping


Summary:

The mining methods are cut-and-fill and longhole open stope. Cut-and-fill is typically used for the larger mining areas, when the orebodies exceed 20m spans. While this method allows for selectivity, it has constraints in terms of productivity. Longhole open stope on the other hand is less selective, but allows higher productivity.


Crushing and Grinding


Processing

  • Gravity separation
  • Calcining
  • Flotation
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Merrill–Crowe
  • Cyanide (reagent)
  • Roasting

Source: Subscription required

Summary:

Cuiabá and Lamego mines feed the Cuiabá gold plant (flotation) and Queiroz (roaster, carbon circuit and refinery) plants, currently at 1.7Mtpa for a metallurgical recovery of 93.3%. At the Cuiabá gold plant, crushing and milling of the ore is followed by flotation and filtration in order to produce a concentrate, which is transported by aerial ropeway to Queiroz for further treatment. Approximately 25% to 30% of gold is recovered through a gravity circuit at the Cuiabá plant. The backfill plant is also located at Cuiabá. The Queiroz plant is located in Nova Lima, it was built with two different metallurgical routes to treat refractory ore and non-refractory ore. The concentrate is burned, and the calcine proceeds to a carbon circuit for further refining. The sulphide gas is captured for processing through the acid plant; approximately 230ktpa of sulphuric acid are produced as a by-product.

Gold production process starts at Cuiabá plant where the Mechanical Treatment is situa ........


Combined production numbers are reported under AGA Mineracao Operation


Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 1.69 Mt Gold 2.95 g/t 0.16 M oz
Proven & Probable 1.69 Mt Sulphur 2.5 % 92 M lbs
Total Resource 12.13 Mt Gold 3.08 g/t 1.2 M oz
Total Resource 12.13 Mt Sulphur 4 % 1,068 M lbs


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Year-end Mineral Reserves 2018
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2016
Other 2015
Year-end Mineral Reserves 2015
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Aerial view:

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