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Brazil
CentroGold Project

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 Location:
46 km SW from Maracaçumé, Brazil

  Project Contacts:
Rua Da Alegria, 508, Lote 3 Quadra12 Farol
Centro Novo Do Maranhao
Brazil
65299-000
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  • Overview
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  • Geology
  • Mining
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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life7 years (as of Jan 1, 2019)
The CentroGold Project is considered to be one of the largest undeveloped gold projects in Brazil.


Owners

Source: p. 11
CompanyInterestOwnership
OZ Minerals Ltd. 100 % Indirect

Contractors

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Deposit Type

  • Vein / narrow vein
  • Mesothermal


Summary:

Gold mineralisation within the CentroGold project is considered to be typical of mesothermal veinstyle, or orogenic-style gold mineralisation.

The host of the primary mineralisation at the CentroGold deposits is a coarse, equigranular intrusive of tonalitic composition, close to the contact with a fine-grained arenite. Rocks in the deposit have been significantly affected by hydrothermal alteration. Gold mineralisation is closely associated with sulphide content within zones of quartz-sericite-pyrite alteration.

Mineralisation at the Contact deposit is typically sub-vertical, with flatter lying high-grade zones hosted in rafts of sediment within the tonalite intrusion host rock. The Mineral Resource has been completed using two individual grade domains using a nominal 0.4 g/t gold cut-off grade for wireframing.

The Blanket deposit is a shallow dipping (approximately 20-30 degrees), tabular body of medium grade gold mineralisation. The Mineral Resource has been completed using five individual grade domains constructed using a nominal 0.5 g/t gold cut-off grade for wireframing.

Blanket Deposit
The reported Blanket Mineral Resource is contained within a volume defined by the following coordinates:
• 9,750,170 mN to 9,751,020 mN
• 364,240 mE to 364,820 mE
• 60 mRL to –180 mRL.

Mineralisation has a strike length of 850 metres, an across-strike length of 656 metres and runs from surface down to 240 metres be ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The pit optimisation was performed using NPVS. Before the block model was uploaded into NPVS, new attributes were created to apply costs and recoveries. A traditional drill and blast, excavator and truck operation was modelled.

A NPVS pit shell (revenue factor 1) was chosen as the basis of the design from the optimisation. The cutoff grade used was selected in the preceding Hill of Value study. This cut-off was higher than the economic breakeven cut-off determined by NPVS. Thus, all material with a grade above the economic breakeven cut-off and below the Hill of Value cut-off (0.9 g/t), was treated as low-grade ore, stockpiled and later reclaimed for processing at the end of the LOM.

The two orebodies, Blanket and Contact, are proposed to be mined simultaneously in a 24 hour per day operation. The optimisation indicated a preference to mine the higher-grade Contact deposit first, as well as the need to undertake a moderate pre-strip to enable reasonable volumes to be mined in the following two years.

To accommodate the volume of waste, three different waste dumps were designed, based on material type and previous licensing locations. A small dump was strategically positioned in front of the tailings dam, with all dumps a minimum of 200 m from the pit crest.

A decision was made to use a contract mining scenario – responsible for drilling, loading, hauling, waste dump and stockpile construction, reclaiming of ore to the crusher, drain ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 1451,100
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Stripping / waste ratio 3.9 *
Total tonnes mined, LOM 116 Mt *
Annual processing rate 2.5 Mt *
* According to 2019 study.

Reserves at June 24, 2019:
CentroGold Project Combined ‘Blanket’ & ‘Contact’ 0.4 g/t Au cut-off.

CategoryTonnage CommodityGradeContained Metal
Probable 20 Mt Gold 1.7 g/t 1,100 koz

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2019 study / presentation.

Operating Costs:

Units2019
OP mining costs ($/t mined) USD 15.3 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t mined) USD  ......  Subscription required
* According to 2019 study.
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2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 2, 2022
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Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Preliminary Economic Assessment 2018
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