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Brazil
Carajás East Operation (Antas (Antas North) Mine, Pedra Branca Mine)

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 Location:
62 km S from Parauapebas, Brazil

  Regional Office:
Alameda Oscar Niemeyer, 119 – 7th Floor (Office 703) – Vila da Serra
Nova Lima
Brazil
34006-056
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Copper
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Sub-level stoping
  • Bench stoping
  • Backfill
Production Start...
Mine Life8 years (as of Jan 1, 2021)
The Carajás hub consists of the Antas mine and the Pedra Branca underground mine. Mining of the Antas North open pit was completed in June 2021.
Company will continue to reclaim and process the remaining Antas surface stockpiles into 2022 as the ramp-up and transition to full Pedra Branca feed occurs.


Owners

Source: p. 8
CompanyInterestOwnership
OZ Minerals Ltd. 100 % Indirect
OZ Minerals operates the Carajás East hub in Brazil.

Contractors

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Deposit Type

  • IOCG


Summary:

The Carajás East hub includes the Antas Open Pit (completed in June 2021) and the Pedra Branca underground mine.

Pedra Branca
The area to the south of the deposit is dominated by a sequence of meta-gabbro-diorite interspersed with foliated pegmatites of granitic composition while the northern area is covered by a sequence of gneisses of granitic composition. The contact between the two rock units is represented by a shear zone which generally controls the distribution of the mineralisation with the Pedra Branca deposit comprising two zones of mineralisation, namely the “West” and the “East”.

The copper mineralisation is strong and pervasive, with various types of mineralisation (semi massive to
disseminated) being distinguished in the drill core.

Pedra Branca East (PBE) is an Iron Oxide Copper Gold (IOCG) type deposit located within the Carajás Basement, and is hosted predominantly by diorite and sheared granite. Country rocks are mostly biotitegneisses (ortho-gneisses), while pegmatite dykes are abundant in proximity to the ore zones.

This deposit occurs along an E-W striking regional shear zone, which is represented by metres wide mylonitic zones marked by intense silicification. This shear zone is regionally crosscut by north-south, northeast and northwest striking faults.

PBE consists of a single continuous orebody, which strikes east-west and has a >600m strike extension. It is a sub-vertical to steeply ........


Mining Methods

  • Truck & Shovel / Loader
  • Sub-level stoping
  • Bench stoping
  • Backfill


Summary:

The Company achieved a significant milestone with the start of mining ore from stopes at Pedra Branca, the first of the satellite mines to be realised under the Hub Strategy. In 2021 Pedra Branca’s successful transition from a concept study to being permitted, built and into successful commissioning and production within three years is proof of the Brazil team’s ability to deliver our Strategy.

The box cut, portal and initial few metres of decline was completed in 2016 and much of the infrastructure to resume its initial excavation is in place.

Sublevel stoping was selected as the mining method and has been deemed suitable for the orebody, based on orebody geometry and rock mass qualities.

Detailed infrastructure design was completed upon the mine design to address the required mine ventilation, mine dewatering, power supply, controls, and communication requirements.

The mine plan targets a ~1 Mtpa10 production rate, achieved in Q1 2022 with a total mine life of 8 years. Sublevel stoping with rock backfill will be applied in a bottom up bench stoping configuration. Stopes will be mined via long hole open stoping.

The pre-concentration and development waste will be utilised as backfill.

Mining of the Antas North open pit was completed in June 2021. The Company will continue to reclaim and process the remaining surface stockpiles into 2022 as the ramp-up and transition to full Pedra Branca feed occurs. ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits2022202120202019
Copper Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2022202120202019
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required468,732 t
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required4,849,538 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required773,602 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at November 15, 2019:
The Mineral Resources and Reserves as at 16th November 2021 at Pedra Branca are unchanged from November 15, 2019.

Mineral Resources do not include Antas Resources.

CategoryTonnage CommodityGradeContained Metal
Proven 1.1 Mt Copper 1.9 % 21 kt
Proven 1.1 Mt Gold 0.6 g/t 20 koz
Probable 3.9 Mt Copper 2.1 % 83 kt
Probable 3.9 Mt Gold 0.5 g/t 69 koz
Proven & Probable 5 Mt Copper 2.1 % 104 kt
Proven & Probable 5 Mt Gold 0.5 g/t 89 koz
Measured 2.3 Mt Copper 1.6 % 37 kt
Measured 2.3 Mt Gold 0.5 g/t 35 koz
Indicated 11 Mt Copper 1.6 % 190 kt
Indicated 11 Mt Gold 0.4 g/t 160 koz
Inferred 4.8 Mt Copper 1.5 % 72 kt
Inferred 4.8 Mt Gold 0.4 g/t 69 koz
Total Resource 19 Mt Copper 1.6 % 300 kt
Total Resource 19 Mt Gold 0.4 g/t 270 koz

Commodity Production Costs:

CommodityUnits2022202120202019
Credits (by-product) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs Copper USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Copper USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
C1 cash costs Copper USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2022202120202019
Capital expenditures (planned) M AUD  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 14, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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