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Carajas Iron Ore Mine, Brazil

Carajas_Iron

For Q2 2008 Carajas produced 23.2 million tons of iron ore, a 9.4% increase on the previous corresponding period.

The Carajás Mine is the world's largest iron ore mine and is located in the state of Para in Northern Brazil. Fully owned by Brazilian miner Vale (CVRD), the mine holds 7.2 billion metric tons of iron ore in proven and probable reserves.

The Carajas region boasts the richest reserves and concentrations of iron ore anywhere in the world and was discovered entirely by accident in the late 60s when a US Steel Helicopter was forced to land on a hill in the area to refuel. Surveyors on board noted the baron state of the hill and subsequently discovered that the iron content was as high as 66%.

Other mineral deposits were discovered later; Carajás is rich not only in iron ore but also ores for manganese, copper, tin, aluminium and even gold.
 
Carajás iron deposit and mine development

US Steel wanted to develop the Carajás iron deposit but the Brazilian Government was unwilling to hand control over to a foreign company. Brazil is currently the world's largest exporter of iron ore with annual production of over 200Mt.

 
"The Carajas ores are found within Archaean iron formations."

In 1970 the Brazilian government opted instead to create a joint venture company, Amazonias Mineração SA (AMZA), of which 51% was owned by Vale and 49% was owned by US Steel.

US Steel subsequently withdrew from the joint venture in 1977 by selling its share to CVRD for $55m. Vale produced 237.9Mt of iron ore at the Carajas Mine for 2009, against 301.7Mt in 2008.

 
Carajas iron ore mine expansion
Carajas_iron_ore_mine_expansion

A truck in operation at the Carajas Mine.

 
In 2007, Vale approved an expansion project of the Carajas mine. The $2.48bn project, Carajas 130, currently under way, is expected to add 30 million tons a year to the current capacity of 100m tons a year. In 2009, $798m was diverted towards the project. The project will oversee the construction of a new plant including primary crushing, processing and classification units.

Significant investments in logistics will also be made. Originally scheduled for completion in the second half of 2009, the project was postponed. Commissioning was re-scheduled for the first half of 2012 based on the concession of environmental issues.
 

"Vale produced a record 296 million metric tons of iron ore at the Carajas Mine for 2007, a 12% rise on 2006."

To compensate for the delay in the completion of Carajas 130 project, another 10Mt/y brownfield project was constructed in the northern range of Carajas. The project, completed in the first half of 2010, increased the capacity of the iron ore beneficiation plant by 10Mt/y.

 
Carajás geology and iron ore reserves
Carajas_geology

The volcanic sequence has been weathered to a depth of between 100m and 150m.

The Carajás ores are found within Archaean iron formations. The volcanic sequence has been weathered to a depth of between 100m and 150m, while oxidation is observed to a depth of up to 500m in the BIFs of the ore zone.

 

The upper 80% of the reserve comprises a soft, friable enriched limonite near surface passing down into hematite to a vertical depth of around 300m. Hematite rich, but harder and more siliceous pods occur within the soft hematite, but also as a transition to the un-enriched BIF at depth.

The Carajás District contains known reserves of the order of 18 billion tons with an average grade of 65.4% Fe.

The reserves are distributed in a number of deposit groups, the largest of which is the North Range with - 6,200Mt @ 65.8% Fe, 0.038% P, 1.0% SiO2, 1.05% Al2O3, 0.45% Mn, 0.01% S, 0.02% KO, 0.03% Na2O and 1.88% LOI. The other reserves include: South Range, 35km to the south – 10,400Mt @ 66.3% Fe; East Ridge – 400Mt @ 65.9% Fe; and South Felix Ridge – 600Mt @ 62.8% Fe. The current production contains < 1% Al2O3, < 1% SiO2, < 0.03% P2O5 and < 0.3Mn, with about 10% lump and 90% fines.

The Carajás District contains 7.2 billion metric tons of proven and probable reserves as of 2009 estimates.

 
Open pit mining at Carajas

The operation utilises an open pit mining complex with an initial capacity of 35 million tons a year (tpy) – soon to be extended – a deep-water port near the city of Sao Luis, in the Northeastern State of Maranhao, with a handling capacity of vessels of up to 280,000dwt, and a single track 1.6m gauge railway line of approximately 890km interconnecting the mine to the port.

 
Iron ore production at Carajas

Vale's iron ore production for 2011 at Carajas was 322.6 million metric tons, an increase of 4.8% from 2010.
Accounting for 34% in Vale's total production in 2011 in contrast to 30.2% in 2007, Carajas continues to be the largest source of quality iron ore for Vale.

In January 2012, Vale also obtained the operation license for the N5 Sul pit, which will allow accessing the new ore body in the N5 mine of Carajas. The new ore body is believed to have the highest ferrous content within Vale's portfolio.

 
Future development plans for Carajas iron mine

A major project called Carajás Serra Sul S11D Iron project for the expansion of mining and processing at the Carajás Mining Complex is in the pipeline. It involves a total investment of $19.5bn, including $8.1bn for installing the new mine and processing plant, and around $1.4bn for the logistics infrastructure. The project is planned to be implemented from 2013 and is expected to generate up to 30,000 direct jobs.

In a positive development for the S11D Iron project, Vale received the installation license for the expansion of the Carajás railroad (EFC) that links the company's mining operations in the state of Pará with the Ponta da Madeira maritime terminal in the state of Maranhão, Brazil. It will include 786km of rail works and the duplication of 559.7km of railway.

Upon its expected completion in 2017, the Carajás S11D Iron project will produce and supply more than 90 million metric tons of iron ore per year. It will help to further consolidate the position of Vale in the global iron ore market.

Courtesy www.mining-technology.com

 
 
 
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