Sustainability

Tailings Management

The Company currently manages seven tailings facilities at its operations in Brazil (four at the MCSA Mining Complex and three at the NX Gold Mine). Each of these facilities is routinely inspected by the Company's internal technical teams, third-party engineering firms and applicable regulatory agencies. Due to the flat lying topography, non-existence of down-stream communities and limited elevation of each of the facilities, all of the dams monitored by the Company are all classified as low risk[1]

At the MCSA Mining Complex, the Company's largest operation, a conventional tailings dam is no longer in use due to the implementation of co-disposal. The co-disposal method entails utilizing the inherent void space within surface waste rock stockpiles by allowing tailings to permeate the piles. The method has produced excellent results since 2011, allowing increased process water recycling, significantly reduced pumping costs, creating substrate for revegetation of the waste rock stockpiles and, since implementation, has eliminated the need for conventional tailings storage. The historic tailings facility is currently being reclaimed as part of the Company's revegetation program. 

At the NX Gold Mine, non-inert tails from the Company's CIL process are stored in a HDPE lined excavated pit. Inert tails are stored in a single-lift rockfill dam of segmented ring-dyke design, with only one cell operational at any given time until the taiils are de-watered. De-watered inert tails are transported periodically from the tailings storage facility to legacy areas disturbed by artisanal mining activity prior to construction of the mine. Once filled, these areas are revegetated and reclaimed as part of the Company's ongoing environmental sustainability efforts. 

A comprehensive guide to the Company's tailings facilities can be found here:

 2019
Ero Copper Tailings Management TableView PDF

Please refer to the technical reports for both the MCSA Mining Complex and NX Gold Mine for additional scientific and technical information regarding the Company's tailings management practices, available on the Company's website and SEDAR (www.sedar.com).

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