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Brazil
Mineração Rio do Norte (MRN) Mine

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 Location:
24 km SW from Porto Trombetas, Brazil

  Address:
Porto Trombetas, Oriximiná, PARA
Porto Trombetas
Brazil
68275-000
Phone  ...  Subscription required
Fax55-93-3549-1482
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Bauxite
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life1.3 years (as of Jan 1, 2021)


Owners

Source: p. 1
CompanyInterestOwnershipInvestor's Info
Norsk Hydro ASA 5 % Indirect
Companhia Brasileira de Alumínio (CBA) 10 % Indirect
Rio Tinto plc 12 % Indirect
South32 Limited 33 % Indirect
Vale S.A. 40 % Indirect
Mineração Rio do Norte S.A. (MRN) (operator) 100 % Direct
On May 2, 2022, South32 Ltd. completed the acquisition an additional 18.2 per cent interest in the Mineração Rio do Norte (MRN) bauxite mine in northern Brazil from Alcoa Corporation. The acquisition takes its ownership of the mine to 33 per cent.

Mineração Rio do Norte S.A. (MRN) is a joint venture between affiliates of Rio Tinto (12%), Companhia Brasileira de Alumínio (10%), Vale S.A. (Vale) (40%), South32 (33%), and Norsk Hydro (5%) for the operation of a bauxite mine in Porto Trombetas in the state of Pará in Brazil.

Contractors

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Deposit Type

  • Sedimentary
  • Bauxite


Summary:

The bauxites of Trombetas operate the mines of Saracá V, Saracá W and Bela Cruz, where the ore lies at an average depth of 8 meters and is covered with dense vegetation and a layer of overburden made up by organic soil, clay, nodular bauxite and ferruginous laterite.

The bauxites of Trombetas are associated with the plateaus, high areas with relatively plan ridges and elevations between 200 and 160 meters, which were formed from lateritization processes acting on sedimentary rocks (which contained aluminous minerals) from the Paleogene period (about 40 million years).

The mineralization of bauxite occurs at the top of the plateau and is normally covered by a layer of clay, 4 to 10 meters thick. However, near the edges of the plateaus, bauxite might even be outcropping in the soil.

Bauxite is a rock made up of different minerals (gibbsite, kaolinite and quartz), the first being the source of aluminum.

A typical bauxitic profile consists of the following horizons:

- 4 - organic soil with a maximum thickness of 0.5m;
- 3 - yellow clay covering most bauxitic profiles, consisting of kaolinite (80%) and quartz, with a maximum thickness at the center of the plateau, decreasing to its edges;
- 2 - bauxitic layer with an average thickness of 4 m, subdivided into three subhorizons:
- 2c – nodular bauxite;
- 2b – ferruginous laterite;
- 2a – massive to granular bauxite;
- 1 - variegated clay.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The MRN mine is an open-cut strip mining operation that has an 18Mtpa installed bauxite capacity.

For bauxite to be mined out, first it has to be stripped off. This operation is done in a sequential manner in regular strips, where the overburden is excavated and dumped into the adjacent strip in which the ore was previously mined out.

After being mined out, the ore is loaded on trucks and transported to the crushing plant, where it is reduced to a particle size of up to three inches. From the crushers, the ore is transported on conveyor belts to the washing, cycling and filtering facilities.

As a result from this beneficiation process, approximately 25% of solid mass, known as bauxite tailings, is generated. The tailings are dumped into reservoirs built in mined-out areas on the Saracá plateau.

Once beneficiated, the ore is transported from the mine to the port along a 28-km-long railway. In this operation, trains with 46 rail cars each are used.


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityUnits202120202019201820172016
Bauxite kt  ......  Subscription required  ......  Subscription required  ......  Subscription required13,13414,69816,462
All production numbers are expressed as fines.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20212020201920182016
Annual production capacity  ......  Subscription required  ......  Subscription required18 Mt of bauxite fines18 Mt of bauxite fines18 Mt of bauxite fines
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Reserves at December 31, 2021:
Reserves of bauxite is shown as recoverable Reserves of marketable product after accounting for all mining and processing losses.

CategoryOreTypeTonnage CommodityGradeRecoverable Metal
Proven Bauxite M dmt Al2O3 48.7 % 43 M dmt
Probable Bauxite M dmt Al2O3 48.9 % 12 M dmt
Proven & Probable Bauxite M dmt Al2O3 48.8 % 55 M dmt
Measured Bauxite 251 M dmt Al2O3 49.6 %
Indicated Bauxite 31 M dmt Al2O3 48.5 %
Measured & Indicated Bauxite 282 M dmt Al2O3 49.5 %
Inferred Bauxite 134 M dmt Al2O3 49.9 %
Total Resource Bauxite 416 M dmt Al2O3 49.6 %

Financials:

Units202120202019201820172016
Revenue M BRL  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,723   1,310   1,498  
Pre-tax Income M BRL  ......  Subscription required  ......  Subscription required  ......  Subscription required 23.6   124.9   508.8  
After-tax Income M BRL  ......  Subscription required  ......  Subscription required  ......  Subscription required 15.9   106.3   429.6  
EBITDA M BRL  ......  Subscription required  ......  Subscription required  ......  Subscription required 464.3   328.1   586.6  
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Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of June 30, 2016:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Shovel (hydraulic) ....................... Subscription required 90 t ....................... Subscription required
Tipper truck ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 27, 2022
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....................... Subscription required ....................... Subscription required Subscription required Apr 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 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 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Review 2018
Annual Report 2017
Annual Report 2016
Annual Report 2016
Annual Report 2016
Annual Review 2016
Annual Review 2015
Annual Report 2014
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