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Brazil
Barro Alto Mine

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 Location:
11 km SW from Barro Alto, Brazil

  Regional Office:
Century Tower Building Rua Maria Luiza Santiago, 200 – 8th floor – Santa Lúcia
Belo Horizonte
Brazil
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Nickel
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life20 years (as of Jan 1, 2021)


Owners

Source: p. 29,86,230
CompanyInterestOwnership
Anglo American plc. 100 % Indirect

Contractors

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Deposit Type

  • Saprolite
  • Laterite


Summary:

The Barro Alto mineral resource is primarily saprolite overlain by laterites and extends for 35 km in an arc from southwest to northeast. The deposit is in the Barro Alto mafic-ultramafic complex, which is part of the Pre-Cambrian shield in the state of Goiás. The complex is composed of a sequence of serpentinised dunites and pyroxenites, enveloped by gabbros.

The mineralisation corresponds to the surficial weathered portions of the serpentinites. There are three types of saprolitic ore. The West type ore tends to have higher nickel grades and silica/magnesia ratios than the East type and Plain type ores.

The Barro Alto complex is bounded by metamorphic volcanic-sedimentary sequences (Ferreirafilho et al., 1992) and is a major mafic-ultramafic layered intrusion that was subjected to granulite facies metamorphism. It is composed mainly of gabbronorite, with minor dunite, peridotite, norite, gabbro, anorthosite and banded clinopyroxene-garnet amphibolite (Moraes and Fuck, 2000). In the complexes of Niquelandia and Barro Alto, lateritic weathering has formed important reserves of extractable Ni ore, representing around 2 million tons of metallic Ni (Raous et al., 2010). Ultramafic areas are characterized by a natural enrichment in heavy metals. In the case of the Barro Alto complex, this enrichment is mainly in Ni, however the Cr content has been reported as high as 6030 mg kg-1 (Ratié et al., 2015) and 46800 mg kg-1 (Raous et al., 2010), which is not high ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

No blasting is required to access the relatively soft laterite/saprolite ore, which is loaded by a backhoe hydraulic excavators with a maximum working bench height of 2.5 m. These load a fleet of trucks, which transport the material to a ROM stockpile.


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2021202020192018201720162015
Nickel t  ......  Subscription required  ......  Subscription required  ......  Subscription required33,50034,90035,50021,300
All production numbers are expressed as metal in alloy.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required4,075,600 t4,667,200 t6,272,800 t2,630,700 t
Tonnes processed  ......  Subscription required  ......  Subscription required2,265,700 t2,264,200 t2,309,300 t2,357,100 t
Annual production capacity  ......  Subscription required  ......  Subscription required36,000 t of nickel metal in alloy
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Reserves at December 31, 2021:
Mineral Resources are quoted above a 0.90 %Ni cut-off.
A stockpile of ~184 kt Ni (14.1 Mt at 1.30 %Ni) Probable Reserves is excluded from the table.
A stockpile of ~54 kt Ni (4.3 Mt at 1.25 %Ni) Indicated Resources is excluded from the table.

CategoryTonnage CommodityGradeContained Metal
Proven 12.7 Mt Nickel 1.4 % 178 kt
Probable 35.5 Mt Nickel 1.26 % 448 kt
Proven & Probable 48.2 Mt Nickel 1.3 % 626 kt
Measured 2.5 Mt Nickel 1.15 % 29 kt
Indicated 16.9 Mt Nickel 1.15 % 195 kt
Measured & Indicated 19.4 Mt Nickel 1.15 % 224 kt
Inferred 5.5 Mt Nickel 1.33 % 73 kt

Financials:

Units2016
Revenue M USD 344  
Earnings M USD -48  
EBITDA M USD 54  



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2012

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Other 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Year-end Mineral Reserves 2015
Corporate Presentation 2014
Other 2012
Other 2012
Press Release 2012
Other 2007
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