Ero Copper Corp.

Copper discovery in Bahia

Caraíba Metais is founded (mining and smelting operations)

BNDES assumes control of Caraíba Metais

Open pit mining operations commence

Underground mining operations commence

Caraíba Metais is divided into Mineração Caraíba S.A. ("MCSA"), the mining arm, and Caraíba Metais, the smelting arm, which was later privatized and eventually renamed Paranapanema

MCSA is privatized under Brazil’s National Privatization Program

MCSA acquires the mining rights of NX Gold in June, today known as the Xavantina Operations

MCSA acquires the mining rights for the Boa Esperança Project, today known as the Tucumã Operation

Construction of the Xavantina Mine commences in the second half of the year

Construction of the Xavantina mine successfully completed with first bullion sold in May

MCSA and NX Gold enter judicial reorganization in February

Ero Copper acquires MCSA and NX Gold in December

Construction of the Vermelhos underground mine commences at the MCSA Mining Complex, today known as the Caraíba Operations, in April

Ero Copper IPOs on the TSX in October

Vermelhos underground mining operations commence at the Caraíba Operations in September

Ero Copper begins trading on the NYSE in June

Construction of the external shaft at the Caraíba Operations commences in the first quarter

Ero Copper successfully completes inaugural US$400M Senior Note issuance with Goldman Sachs in January

Construction of the Tucumã Project commences in February

Construction of the Tucumã Project successfully completed with first copper concentrate produced in July

Ero Copper enters into a partnership with Vale Base Metals on the Furnas Copper-Gold Project in the Carajás Mineral Province in July

The Phase 1 Drill Program at the Furnas Copper-Gold Project commences in October

The Phase 2 Drill Program at the Furnas Copper-Gold Project is conducted between July and October, and the Phase 3 Drill Program began immediately thereafter

Ero announces result of a year-long value-creation initiative at Xavantina to capture value from stockpiled gold concentrates produced in small but high-grade quantities since processing operations began in 2012. This work culminates in the commencement of gold concentrate sales in Q4 2025

The Phase 1 Drill Program at the Furnas Copper-Gold Project is completed in July

Tucumã achieves commercial production effective July 1, 2025