Brazil

Deepening Inferred (Extension) Project

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Categories

Overview

Mine TypeUnderground
StageConstruction
Commodities
  • Copper
Mining Method
  • Blast Hole Stoping
  • Transverse open stoping
  • Longitudinal open stoping
Backfill type ... Lock
Production Start... Lock
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SnapshotThe Caraíba Operations plans to create a two-mine system at the Pilar Mine (known as Pilar 3.0) whereby the upper levels of the mine, currently in operation, will be serviced by the existing shaft, while the Deepening Extension Zone will utilize a new, larger external shaft, expected to result in significant growth in total ore production from the mine, ramping from current levels of approximately 1.3 million tonnes per annum to approximately 3.0 million tonnes by 2026. Construction of the new external shaft began in the third quarter of 2021.
Related Asset

Owners

SourceSource
CompanyInterestOwnership
Ero Copper Corp. 99.6 % Indirect
Mineração Caraíba S.A. (operator) 100 % Direct
Ero Copper Corp. has 99.6% interest in Mineração Caraíba S.A.

MCSA holds a 100% interest in each of the Caraíba Operations.

Contractors

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Deposit type

  • Magmatic

Summary:

The Pilar Mine is located in the southern part of the MCSA Mining Complex within the Curaçá Valley. The geology of the mine consists of a high-grade metamorphic terrain, composed of gneiss and migmatite of the Caraíba Complex that were intruded by mafic, ultramafic and late granitic rocks. The mafic and ultramafic intrusions are mainly composed of pyroxenite, norite, and gabbro. The melanorite is a term used for logging purpose to describe a host rock, either a gneiss, a gabbro or a norite, that is intruded by several mafic-ultramafic dykes that are too small individually to be logged separately. The gneissic country rocks have gone through 3 phases of deformation and show fold-interference patterns. The ultramafic units as well as the late granitic and pegmatite intrusions were emplaced after the 3 phases of deformation in the gneiss and generally dip steeply to the west and strike northerly. Recent underground mapping indicates that some of the pegmatite dykes were emplaced along faults (MCSA, 2020). The NWstriking diabase dykes and quartz veins crosscut the metamorphic and intrusive units. A series of shear zones, oriented NNE and NNW with moderate westerly dip, represent a late deformation event but their relative displacement is not well documented (D’El Rey Silva, 1984, Frugis, 2017). Finally, a series of late faults, oriented NE to ENE and NW, are also reported by D’El Rey Silva (1984) but with unclear sense and amount of displacement. The gneiss and migmatites, together with some intrusive bodies are affected by various alteration assemblages including potassic (phlogopite and K-feldspar), sodic (albite), calcsilicate (diopside), carbonate, as well as epidote and lesser garnet. The alteration variably overprints the original texture of the rock units and it obliterates the gneissic foliation where the alteration is more intense. The phlogopite was generally developed later than the k-feldspar and the diopside alteration and is frequently associated with the copper mineralization. Mineralization at the Pilar UG Mine is composed of copper sulphides in the form of chalcopyrite, bornite and rarely chalcocite that occur in four different styles: disseminated, veins, massive, and brecciated. Other sulphide minerals include millerite, pyrite and pyrrhotite. Magnetite is the dominant oxide mineral and occurs intergranular together with chalcopyrite and bornite (Tappert, 2020). The sulphides are heterogeneously distributed in the pyroxenite units in the form of lenses that trend N-S, dip steeply to the west and range from less than 1 meter to 20 meters thick. The known copper mineralization at Pilar extends for 1.2 km N-S, up to 170 m E-W, and has been drilled to a depth of more than 1.6 km along its steep northerly plunge. The mineralized bodies occur in sharp contact with migmatites and at variable angle to the main foliation of the host-rock. In the P1P2 sector of the mine, located in the upper levels of the Pilar UG Mine, mineralization is distributed around an interpreted steeply west dipping tight syncline plunging shallowly to the south. The fold hinge is interpreted as a structural trap for high-grade copper mineralization. Strongly foliated sub-vertical anastomosing shears as well as brittle faults crosscut and locally displace the mineralization.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

Combined production numbers are reported under

Operational metrics

Metrics
Annual mining capacity  ....  Subscribe
Ore tonnes mined, LOM  ....  Subscribe
* According to 2022 study.

Production Costs

Commodity production costs have not been reported.

Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ........... Subscription required Subscription required Jul 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 18, 2023

Aerial view:

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