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Brazil
Jambreiro Project

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 Location:
186 km NE from Belo Horizonte, Brazil

  Project Contacts:
Avenida Barao Homem de Melo, 4391 Salas 606 e 607 - Estoril
Belo Horizonte
Brazil
30.494.275
Phone  ...  Subscription required
Fax+55-31-9301-1938
EmailEmail
WebsiteWeb
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  • Overview
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  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
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  • Filings & News

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Overview

StagePre-Feasibility
Mine TypeOpen Pit
Commodities
  • Iron Ore
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Spiral concentrator / separator
  • Magnetic separation
Mine Life18 years (as of Jan 1, 2019)


Owners

Source: p. 6
CompanyInterestOwnership
Centaurus Metals Ltd. 100 % Indirect
Centaurus Brasil Mineração Ltda. 100 % Direct
The Jambreiro Iron Ore Project comprises three granted Mining Leases (ML’s). All of these ML’s are 100%-owned by Centaurus Brasil Mineração Ltda, a wholly-owned Brazilian subsidiary of Centaurus.

Deposit Type

  • Iron formation hosted


Summary:

The Jambreiro Project is part of a sequence of Archean to lower Proterozoic iron formations (locally known as “itabirite”) and described as the Guanhães Group in the Guanhães region. Mineralisation is hosted in a metavolcanic-sedimentary sequence of rocks including itabirites, quartz-mica schist, amphibolite and gneiss. The friable itabirite extends to a vertical depth of 120m before becoming more compact. The principal ore zone, known as the Tigre Deposit, has a strike extent of 1.8km with true widths varying between 40-80m.

There are three satellite prospects in the immediate project area within 500m of the Tigre Deposit, being: the Cruzeiro, Galo and Coelho (North and South) Deposits. The friable iron mineralisation is continuous along strike, homogenous, medium to coarse grained and composed of mainly hematite and quartz with small amounts of magnetite.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The proposed mining method for the Jambreiro Project is an open pit mine. There are minimal pre-strip requirements and site access preparations are minimal and will be carried out by a local mining contractor.

The ore will feed a conventional beneficiation plant and the waste will be stored in appropriate waste dump locations. Filtered tailings are to be filtered and blended with mine waste.

A mining dilution factor of 2% has been applied for the deposit. The ore contacts are sharp and visual and the small mining equipment will allow for selective mining.

A mining recovery factor of 98% has been utilised. Similarly to mine dilution, the configuration of the deposit and the selected mining equipment will allow good mining recoveries to be achieved.

The mine parameters were set to accommodate the selected 40t trucks and are set out below. Free digging is expected in all friable itabirite and waste and as such the mining will be performed on nominal 5 metres benches, with final bench heights of 10 metres.

The friable Ore Reserve will provide the Company with approximately 17.9Mt of high-grade product, at an average life-of-mine recovery of 41%, underpinning the initial 18-year mine life at Jambreiro. The average strip ratio for the first four years of the operation is 0.56:1, with a total life-of-mine strip ratio of only 0.68:1 based on a total material movement of 72.9Mt.

The nature of the Jambreiro ore bodies allows for low strip ratios and shorter haulage routes for the first five years, which has a positive impact on both operating and deferred capital costs. The ore and waste are predominantly free-dig from surface over the life of the current mine design, with blasting only expected for 5% of the total material movement for the project. Pit exit ramps have been designed to allow easy access to the ROM-pad area, primary crusher and the main waste storage areas while maintaining a minimum haulage distance.

Where possible, ramp development has been restricted to the footwall side of the pit to minimise the strip ratio.

The mine will be operated by a local mining contractor using 40-tonne off-road trucks that are commonly used in Brazil and readily available in the region.


Crushing and Grinding


Processing

  • Gravity separation
  • Spiral concentrator / separator
  • Magnetic separation

Flow Sheet: Subscription required

Summary:

The Jambreiro Project ROM ore is friable in nature and composed mostly of iron oxides (hematite with minor magnetite) and silica. The grain size distribution test on the ROM ore showed that the top size of the friable material is 44.5 mm with 80% passing at 2.4 mm, demonstrating the sand-like nature of the ore.

The ore characteristics and the desired concentrate specifications lead to the choice of jigging, spirals and Wet High Intensity Magnetic Separation (WHIMS) as the core Jambreiro beneficiation route.

The feed to the WHIMS circuits is also pre-treated in a Low Intensity Magnetic Separation (LIMS) circuit to recover (to concentrate) the small amount of magnetite in the ore.

The process plant consists of the following major elements:
• Primary Screening
• Primary Crushing and Secondary Crushing and Screening (from year 11, introduction of semi-compact ore)
• Tertiary Crushing and Screening
• Jigging
• Scavenger Ball Mill

Recoveries & Grades:

CommodityParameterAvg. LOM
Iron Ore Recovery Rate, %  ......  Subscription required
Iron Ore Head Grade, % 29.1
Iron Ore Concentrate Grade, %  ......  Subscription required
Subscription required - Subscription is required.

Projected Production:

CommodityUnitsAvg. AnnualLOM
Iron Ore M dmt 118
All production numbers are expressed as concentrate.

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

Reserves at June 1, 2019:

CategoryTonnage CommodityGrade
Proven 30.6 Mt Iron Ore 29.4 %
Probable 12.7 Mt Iron Ore 28.4 %
Proven & Probable 43.3 Mt Iron Ore 29.1 %
Measured 44.3 Mt Iron Ore 29.2 %
Indicated 37.7 Mt Iron Ore 27.5 %
Measured & Indicated 82.1 Mt Iron Ore 28.4 %
Inferred 45.1 Mt Iron Ore 27.3 %
Total Resource 127.2 Mt Iron Ore 28 %

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Iron Ore AUD  ......  Subscription required *
C1 cash costs Iron Ore AUD  ......  Subscription required *
Assumed price Iron Ore AUD  ......  Subscription required *
* According to 2019 study / presentation.
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2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscription required
Gross revenue (LOM) $M AUD  ......  Subscription required
EBITDA (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
After-tax NPV @ 8% $M AUD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Heavy Mobile Equipment:

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 29, 2019
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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