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Brazil
Pedra Branca Mine (Carajás East Operation)

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 Location:
62 km SW 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
  • Owners
  • Geology
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
Mining Method
  • Sub-level stoping
  • Bench stoping
  • Backfill
Production Start...
Mine Life8 years (as of Jan 1, 2021)
The Pedra Branca mine is an underground copper mine that is part of the Carajás East Hub in Brazil.

Pedra Branca commenced production from stopes in August 2021.


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 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 dipping (south) plunging shoot, with a thicker higher grade central core which follows the plunge. The orebody begins to shallow out in dip at depth ........


Mining Methods

  • Sub-level stoping
  • Bench stoping
  • Backfill


Summary:

2021: OZ Minerals 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. Pedra Branca’s successful transition from a concept study to being permitted, built and into successful commissioning and production.

Status 2021: Construction complete, delivering processing production ore to Antas.

Mine rate: Ore production of 1.0 Mtpa.

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.

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.


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnitsAvg. Annual (Projected)
Copper kt 18
Gold koz  ......  Subscription required
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics2021
Total tonnes mined  ......  Subscription required
Ore tonnes mined  ......  Subscription required
Waste  ......  Subscription required
Subscription required - Subscription is required.

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

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



Heavy Mobile Equipment as of July 16, 2021:
HME TypeModelSizeQuantity
Truck (dump) ....................... Subscription required 45 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Press Release 2018
Press Release 2017
Press Release 2016
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