Ms. Courtney Lynn reports

ERO COPPER ANNOUNCES VOTING RESULTS OF ANNUAL GENERAL MEETING OF SHAREHOLDERS

Ero Copper Corp. has released voting results from its annual general meeting of shareholders held today in Vancouver, B.C. A total of 88,486,748 common shares were represented at the meeting, being 85.44 per cent of the issued and outstanding common shares of the company as at the March 5, 2025, record date. Shareholders voted in favour of all items of business before the meeting, including the re-election of management's nominees as directors for the ensuing year and the advisory vote on executive compensation. Detailed results of the votes are presented below.

Each item of business voted upon at the meeting is described in detail in the company's management information circular dated March 6, 2025, which is available on the company's website, on SEDAR+ and on EDGAR.

Set the number of directors at 10

Shareholders approved the proposal to set the number of directors at 10 with 99.68 per cent of votes cast in favour.

Election of directors

Shareholders re-elected 10 directors as shown in the attached table.

Appointment of auditor

Shareholders reappointed KPMG LLP, chartered professional accountants, as the auditor of the company and authorized the directors of the company to fix the remuneration to be paid to the auditor with 99.71 per cent of votes cast in favour.

Advisory vote on executive compensation

Shareholders approved the non-binding advisory "say on pay" resolution accepting the company's approach to executive compensation as described in the circular with 98.19 per cent of votes cast in favour.

About Ero Copper Corp.

Ero Copper is a high-margin, high-growth copper producer with operations in Brazil and corporate headquarters in Vancouver, B.C. The company's primary asset is a 99.6-per-cent interest in the Brazilian copper mining company, Mineracao Caraiba S.A. (MCSA), 100-per-cent owner of the company's Caraiba operations, which are located in the Curaca Valley, Bahia state, Brazil, and the Tucuma operation, an open pit copper mine located in Para state, Brazil. The company also owns 97.6 per cent of NX Gold S.A., which owns the Xavantina operations, an operating gold and silver mine located in Mato Grosso state, Brazil. In July, 2024, the company signed a definitive earn-in agreement with Vale Base Metals for a 60-per-cent interest in the Furnas copper-gold project, located in the Carajas mineral province in Para state, Brazil. For more information on the earn-in agreement, please see the company's press releases dated Oct. 30, 2023, and July 22, 2024.