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Brazil
Serra Grande Mine

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 Location:
3 km S from Crixas, Brazil

  Address:
Rodovia GO 336, s/nº - Km 97 Zona Rural
Crixas
Brazil
76510-000
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Cut & Fill
  • Sub-level stoping
  • Room-and-pillar
Production Start...
Serra Grande comprises three mechanised underground mines, Mina III, Mina Nova and Mina Palmeiras, and two open pit mines.


Owners

Source: p. 68
CompanyInterestOwnership
AngloGold Ashanti Ltd. 100 % Indirect
Mineracao Serra Grande S.A. (operator) 100 % Direct

Contractors

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Deposit Type

  • Vein / narrow vein
  • Orogenic
  • Mesothermal


Summary:

The gold deposit is orogenic mesothermal, associated with the development of shear zones. The host rocks belong to the Upper Archaean Crixás Group. Gold mineralisation is associated with meta-sediments and meta-volcanics rocks from the Ribeirão das Antas and Rio Vermelho formations respectively. The Crixás Greenstone Belt is surrounded by granitic gneiss terrains from the Anta and Caiamar complexes and meta-sedimentary rocks from the Santa Terezinha Group, which is part of the Goiás magmatic arc.

The mine complex is located in the Crixás Greenstone Belt sequence, in the central portion of Brazil, and the main host rocks are the meta- sedimentary sequences with association with meta- volcanic meta-basic rocks. The mineralisation at MSG is associated with quartz veins and massive to disseminated sulphides in meta-sedimentary, meta- volcaniclastic and meta-basalt rocks, with differing degrees of hydrothermal alteration developed over orogenical stacked thrust layers (duplexes).

Two main deformation events are responsible by mineralisation style. The first event is the principal thrust event (east over west, called D1) and develops an irregular thrust ramp geometry. This event stacked and inverted the stratigraphic sequence. The second event (D2) was the Santa Terezinha sequence (Magmatic Arc) thrusting over Crixás Greenstone Belt, folding the rocks (F2) and generating the structures that control the gold mineralisation, generally parallel to the fold axis ........


Mining Methods

  • Truck & Shovel / Loader
  • Cut & Fill
  • Sub-level stoping
  • Room-and-pillar


Summary:

Serra Grande comprises three mechanised underground mines, Mina III, Mina Nova and Mina Palmeiras, and an open pit as well as a dedicated metallurgical plant.

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.

Serra Grande operates a single TSF, which will support the LOM production.


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2021202020192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required130133132132
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Daily milling capacity  ......  Subscription required  ......  Subscription required
Plant annual capacity  ......  Subscription required  ......  Subscription required1.5 Mt1.5 Mt1.5 Mt1.3 Mt
Tonnes processed  ......  Subscription required  ......  Subscription required1.3 Mt1.1 Mt1.4 Mt1.3 Mt
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Reserves at December 31, 2021:
Resersves cut-off grades are 2.00 g/t Au for underground and 0.41 g/t Au for open-pit.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 6.37 Mt Gold 2.7 g/t 0.55 M oz
Total Resource 42.18 Mt Gold 2.81 g/t 3.82 M oz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 660 / oz   764 / oz   634 / oz  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (sold) Gold USD 945 / oz   1,103 / oz   1,020 / oz  
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Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 35   38   43  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 27, 2022
....................... Subscription required ....................... Subscription required Subscription required May 27, 2022
....................... Subscription required ....................... Subscription required Subscription required May 27, 2022
....................... Subscription required ....................... Subscription required Subscription required May 27, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015
Subscription required Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Fact Sheet 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Corporate Presentation 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Fact Sheet 2015
Year-end Mineral Reserves 2015
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Subscription required - Subscription is required.

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