Overview
| Status | Closing / Closed |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
Mining at the Antas open pit was completed in June 2021 and it is transitioning into the first hub at Carajás East. Its existing processing plant will continue to be used to process ore from new satellite mines, including Pedra Branca.
Activities focussed on decommissioning the Antas facility through transferring existing tailings to the exhausted mine pit. |
Source:
p. 6
OZ Minerals operate the Pedra Branca underground copper mine in the state of Para, within the Carajás East Hub in Brazil.
Contractors
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Summary:
In the Carajás Hub, tailings are now deposited in the depleted Antas open pit.
The Antas North iron oxide copper gold deposit is hosted within the Carajás Mineral Province which is located in the southern part of the Amazon Craton. Locally the craton is overlain by metavolcanic–sedimentary units of the Rio Novo Group and the 2.76 Ga Itacaiúnas Supergroup. The Itacaiúnas Supergroup hosts all the known Carajás iron oxide copper gold deposits and is thought to have been deposited in a marine rift environment. The Carajás Mineral Province represents one of the best endowed mineral districts in the world and contains the world’s largest known concentration of iron oxide copper gold deposits including the, Salobo, Igarapé Bahia, Alemão, Cristalino, Gameleira, Furnas, Alvo 118, Antas, Pedra Branca and Pantera deposits.
The Antas North deposit is a structurally controlled iron oxide copper gold deposit which is spatially related to (WNW-ESE) regional shear zones, specifically the Carajás fault and the Cinzento shear system. Mineralisation is hosted within hydrothermal brecciated and altered felsic and mafic volcanic units. Mineralised fluids have been sourced from nearby large granitoid bodies and have been focussed along structural conduits resulting in the deposition of high grade (greater than 10 per cent copper) massive sulfide zones immediately adjacent to or within the interpreted main structural zone. These high-grade massive sulfide zones are commonly 2 ........
Summary:
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. The re-purposing of the Antas North open pit void as a tailings storage facility to support the future Carajás East hub operations has commenced. It will be available for use in 2022.
Source:
Summary:
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Production:
| Commodity | Product | Units | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Copper
|
Metal in concentrate
|
M lbs
| ...... | ...... | 26 | 31 | 25 |
|
Copper
|
Concentrate
|
kt
| ...... | ...... | 44 | 51 | 40 |
|
Gold
|
Metal in concentrate
|
oz
| ...... | ...... | ...... | ...... | ...... |
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Operational Metrics:
| Metrics | 2021 | 2020 | 2019 | 2017 | 2016 |
|
Total tonnes mined
| ...... | | | 7,027,085 t | 6,497,037 t |
|
Ore tonnes mined
| ...... | ...... | 468,732 t | 642,366 t | 629,026 t |
|
Waste
| ...... | ...... | 4,849,538 t | | |
|
Tonnes processed
| ...... | ...... | 773,602 t | 708,113 t | 510,830 t |
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Reserves at June 30, 2022:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Indicated
|
0.4 Mt
|
Copper
|
0.8 %
|
|
|
Indicated
|
0.4 Mt
|
Gold
|
0.2 g/t
|
|
|
Inferred
|
1 Mt
|
Copper
|
0.4 %
|
|
|
Inferred
|
1 Mt
|
Gold
|
0.1 g/t
|
|
|
Total Resource
|
1.3 Mt
|
Copper
|
0.5 %
|
6.2 kt
|
|
Total Resource
|
1.3 Mt
|
Gold
|
0.1 g/t
|
6 koz
|
Corporate Filings & Presentations:
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