An updated resource estimate for the Vale do Curaçá property, part of Ero Copper Corp.'s MCSA Mining Complex in Brazil, increased reserves by 108%, while measured and indicated resources increased by 107%.
The company, which holds 99.6% of property owner Mineração Caraíba SA, also updated the Vale do Curaçá mine plan to incorporate the new analysis.
Vale do Curaçá, which comprises the Pilar, Vermelhos and Surubim mines, hosts proven and probable reserves of 18.4 million tonnes grading 1.86% copper, representing 342,800 tonnes of copper.
Reserves are included within measured and indicated resources of 42.4 million tonnes grading 1.71% copper, with 724,400 tonnes of contained copper. Inferred resources were estimated at 6.3 million tonnes grading 1.29% copper for 81,400 tonnes of copper.
The resource estimate used cutoffs of 0.68% copper for underground ore and 0.18% copper for open pit ore.
Ero Copper's updated production plan outlined annual production averaging 41,000 tonnes of copper in concentrate over an initial five-year period.
The company said the new plan provides more flexibility to use the Caraíba mill at the site, which has a processing capacity of 3.2 million tonnes per year, and to evaluate potential expansions in a bid to return the mill to its original capacity of 5.5 Mt/y.
Ero Copper also recently completed an airborne geophysical area and is prioritizing drill targets for further infill and exploration drilling.