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Jambreiro project Pre-Feasibility Study gets underway

Published by
Global Mining Review,


Centaurus Metals has announced that a new Pre-Feasibility Study (PFS) of its advanced, development-ready Jambreiro Iron Ore Project in central Brazil is underway targeting a potential 1 million tpy domestic iron operation that would be ideally placed to capitalise on the new opportunities which have emerged in the domestic and international iron ore market in the past six months. The decision to undertake a new PFS follows the completion of a strategic review of the 2013 Jambreiro iron ore project feasibility study work, an ongoing assessment of the significant changes and marked improvement in the Brazilian domestic and global iron ore market in recent months, and the limited scope changes required to allow for the timely development of the Project to proceed.  

The PFS will build on the extensive Feasibility Study completed in late 2013, which demonstrated robust economics. The company will leverage off the vast amount of detailed technical work that was completed on the Project in the period of 2011 - 2013, as well as the advanced nature of the licences and approvals it already holds in an environment where the supply of high-grade, low-impurity ore in Brazil is now more difficult to access by potential customers. The main activity for the PFS will be an update of the capital and operating costs, as the current design operating parameters and process flowsheet are not expected to change materially – with the exception of a small filtration or centrifuge circuit to treat the slimes portion of the tailings stream to facilitate the dry- stacking of this material.

The company has already commenced work to upgrade the previous JORC Proven and Probable Ore Reserve up to 2012 standard using 2019 operating costs, underpinned by a new pit optimisation and detailed mine plan. Due to the conservative nature of the pit optimisation assumptions used in the 2013 Feasibility Study and the fact that the Ore Reserve only considered the friable Measured and Indicated Resources, the Company does not expect any material change in the Ore Reserve and still anticipates a mine life in the order of 18 years at the planned 1 million tpy production rate. No further drilling of the Project is required. Extensive process testwork completed at the time of the original 2013 Feasibility Study shows that a high- grade iron product (65% Fe) with very low impurities (4.8% SiO2, 0.8% Al2O3 & 0.01% P) can be produced from the friable mineralisation at Jambreiro. This high-grade product attracts a significant premium in the iron ore market compared to the traditional 62% Fe CFR China Index and is a highly sought-after product in the Brazilian domestic market. With tailings management being such a strong focus point for all stakeholders in Brazil at the present time, the company has proactively made the decision that it will dry-stack all tailings produced from its operations at the Project, even though it is already licensed to build a Tails Dam. Due to the nature of the mineralisation at Jambreiro, dry-stacking should not result in any significant capital cost increase for tails management in the mine as any additional plant and equipment required should be offset by the removal of the tailings dam cost.   

The removal of the tails dam will also significantly reduce the overall footprint of the project design and provide the added benefit of allowing for an easier expansion of the Project in the future. The company has recently collected a new bulk (10 t) sample from Jambreiro and is currently having it tested at Fundação Gorceix to determine the optimal solution for the slimes component of the tails and also to produce new product for delivery to potential customers if needed. Importantly, should the Jambreiro project be brought to production, it would be the only processing plant in the region capable of beneficiating itabirite ores. With licensing expected to be increasingly difficult to achieve in Minas Gerais, it is reasonable to expect that Jambreiro could become a strategic processing hub for other miners in the region with significant itabirite resources but which still require approvals to construct a suitable plant to process them.  

Centaurus’ Managing Director, Darren Gordon, said: “The recently completed strategic review has reinforced the quality of the Jambreiro project and the strategic opportunities which now present themselves in the domestic market for a licensed and development-ready asset located in Minas Gerais.   

“Historically the project had strong technical fundamentals and was expected to deliver sound financial returns from an initial 18 year mine life based only on the friable mineralisation contained in the Project Ore Reserve,” Gordon said.  

“Due to recent supply disruptions from the State of Minas Gerais, Brazil coupled with the current positive structural changes in the global iron ore market pricing dynamic which have pushed benchmark 62% Fe CFR China prices above US$100 per tonne, we have commenced a Pre-Feasibility Study leveraging off the extensive amount of work already completed at the Project.  

“Local consensus is that the disruption to supply we are seeing presently in Minas Gerais will not be solved quickly, and this is driving domestic consumers to find alternative, consistent high-quality supply options similar to that which Jambreiro would provide. “We have seen recently other smaller producers in close proximity to Jambreiro achieving mine gate prices in the R$130 - 150/t range for 62% Fe products and this bodes well for a 65% Fe product from Jambreiro given this 62% Fe pricing is over 50% higher than the life-of-mine average mine gate price used in the 2013 Feasibility Study.

“We expect the new PFS – which will pave the way for us to crystallise the significant inherent value in this project – to be delivered by the end of June”.  

Key operating conditions

From a licensing perspective the Jambreiro project is in a unique position. Mining Leases and key environmental licences are in place for the project, which will provide for the timely construction of the project once any development decision is made. This advanced stage of licensing is a huge positive for the Project in the current operating environment in Brazil.   

An amendment to the previously granted Installation Licence will be sought to reflect the company’s decision to dry-stack all tails and to incorporate the reduced footprint arising from the removal of the tails dam from the project design. The company is currently in the process of re-applying for water licences that were historically cancelled to save unnecessary holding costs. Given the licences were previously granted, the company expects to be able to move rapidly to secure the amended approvals once the necessary applications have been made. This will occur in parallel with the ongoing PFS work. A land access agreement is already in place with the land owner, Cenibra. This land access arrangement is effective until 2022, and can be renewed by the company at that time. The land is predominantly a eucalypt plantation and is therefore considered to be a disturbed farming/industrial area. Having only one landowner to deal with is a rarity in Brazil and represents a significant benefit for the planned operation of the Project. Furthermore, Cenibra, as the original project vendor, holds a production royalty and is motivated to see the Project developed.   

Project revenue assumptions

Centaurus has already completed significant analysis of the current pricing regime in the domestic market – both selling to integrated steel mills and also to mining/trading groups with ready access to export logistics. A number of the domestic steel mills have tested the Jambreiro product at their own facilities and have indicated that they are impressed by the high-grade, low impurity product that can be produced from the Jambreiro ore and the ability of Centaurus to deliver this product on a long-term consistent basis.  The company is advancing multiple positive discussions around product sales and off-take agreements that will progress in parallel with the PFS. Historically, domestic steel mill pricing has been a function of the prevailing international export markets less logistic charges back to the mill’s location. Consequently, an analysis of the domestic market pricing is in essence an analysis of the international iron ore pricing environment. Because of this, it appears that a number of the potential domestic customers simply view the price of domestic iron ore as a percentage of an international benchmark for ease of negotiations. Given the recent supply disruptions within the very region that the Jambreiro Project would supply, the domestic price is very attractive. Initial analysis, obtained from discussions with existing domestic iron ore producers in close proximity to Jambreiro, indicates that iron ore grading 62% Fe is currently selling in the domestic market for R$130 - R$150 per tonne on a mine gate basis. This bodes well for a 65% Fe product from Jambreiro, given that this 62% Fe pricing is more than 50% higher than the life-of-mine average mine gate price used in the 2013 Feasibility Study. The higher-grade nature of the Jambreiro product, and its very low impurity levels, is expected to attract a premium in the domestic market, consistent with international markets. Since the 1 million tpy Feasibility Study was completed in 2013, international pricing has changed markedly with respect to premiums for high grade ore and discounts for low grade ore. Based on current published indices, a 65% Fe product would currently attract a premium in the order of US$15/t over a 62% Fe Product. Concurrently with analysing supply opportunities in the domestic market for the high-grade Jambreiro product, the company is also analysing opportunities to sell the high quality Jambreiro product to international export markets.  

Capital costs

The 2013 Feasibility Study was based on Northern Ireland-based CDE Global providing a modularised, fixed- price turnkey proposal for the construction of the Jambreiro beneficiation circuit. The company has re-engaged with CDE Global for them to provide an update on their pricing based on the previously designed and engineered flowsheet. The plant footprint and associated earthworks for the Project are expected to be similar to 2013 given the plant design is not expected to materially change.    

The company has also sought new prices for all of the major equipment used in the processing circuit from the preferred supplier groups assessed at the time of the 2013 Feasibility Study. The 2013 Feasibility Study had a pre-production capital cost of AUS$53 million for a 1 million tpy plant.

Operating costs 

The mine operating costs are expected to be low, in a similar vein to the 2013 Feasibility Study, due to the friable nature of the ore, which does not require drill and blast for the first 10 years of production and the short haulage distances to the ROM and waste dumps arising from enhanced mine planning and design put together in conjunction with CDE Global.  

At the time of the 2013 Feasibility Study, the life-of-mine strip ratio was 0.97:1 with the first five years of operation having a strip ratio of 0.55:1. Multiple mining contractor groups recently completed site visits ahead of providing new pricing on the mining activities of the Project.     

In respect to the labour workforce, the overall manning schedule will be reviewed as well as the current labour rates and conditions prevailing in the labour market in Brazil. Access to skilled mining workers in the local market is good. The process plant is planned to be run on diesel-generated power for the first three years while approvals for a power line to access the grid are obtained. The company will investigate the use of solar power solutions where applicable as favourable development bank funding may be available to the project with the use of a renewable energy solution. The 2013 Feasibility Study forecast an operating cost (including royalties) of AUS$22/t for the initial 1 million tpy project. A full summary of the economic outcomes from the 2013 1 million tpy Feasibility Study were released to the market on 20 December 2013 and 13 January 2014.

Read the article online at: https://www.globalminingreview.com/exploration-development/30052019/jambreiro-pre-feasibility-study-gets-underway/

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