Ero Copper Corp. (TSX: ERO) (NYSE: ERO) is pleased to announce the closing of its offering, on a bought deal basis, of 9,010,000 common shares, including 500,000 common shares issued pursuant to the partial exercise of the Underwriters’ (as defined below) over-allotment option at a price of US$12.35 per Common Share for gross proceeds of approximately US$111 million. The Offering, announced on November 6, 2023, was conducted by a syndicate of underwriters led by BMO Capital Markets, as sole bookrunner and lead underwriter, and including Canaccord Genuity Corp., CIBC World Markets Inc., Scotia Capital Inc., TD Securities Inc., Cormark Securities Inc., National Bank Financial Inc., Paradigm Capital Inc., PI Financial Corp., Raymond James Ltd. and Stifel Canada.

The net proceeds of the Offering will be used to advance growth initiatives at the Company’s Tucumã Project and Caraiba Operations, advance regional exploration in Brazil, and for working capital and other general corporate purposes, as further described in the Prospectus Supplements (as defined below).

The Common Shares were offered in all of the provinces and territories of Canada, other than Quebec, by way of a Canadian prospectus supplement dated November 8, 2023 to the Company’s Canadian short form base shelf prospectus dated August 18, 2023 and were offered in the United States by way of a U.S. prospectus supplement forming part of the Company’s effective registration statement on Form F-10 filed under the Canada/U.S. multi-jurisdictional disclosure system.

Copies of the Prospectus Supplements, the Base Shelf Prospectus and the Registration Statement may be obtained upon request in Canada by contacting BMO Nesbitt Burns Inc., Brampton Distribution Centre C/O The Data Group of Companies, 9195 Torbram Road, Brampton, Ontario, L6S 6H2 by telephone at 905-791-3151 Ext 4312 or by email at torbramwarehouse@datagroup.ca, and in the United States by contacting BMO Capital Markets Corp., Attn: Equity Syndicate Department, 151 W 42nd Street, 32nd Floor, New York, NY 10036, or by telephone at (800) 414-3627 or by email at bmoprospectus@bmo.com. Copies of the applicable offering documents can be obtained free of charge under the Company’s profile on SEDAR+ at www.sedarplus.ca/landingpage/ and EDGAR at www.sec.gov.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy the Common Shares, nor shall there be any sale of the Common Shares in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

ABOUT ERO COPPER CORP

Ero is a high-margin, high-growth, low carbon-intensity copper producer with operations in Brazil and corporate headquarters in Vancouver, B.C. The Company’s primary asset is a 99.6% interest in the Brazilian copper mining company, Mineração Caraíba S.A. 100% owner of the Company’s Caraíba Operations (formerly known as the MCSA Mining Complex), which are located in the Curaçá Valley, Bahia State, Brazil and include the Pilar and Vermelhos underground mines and the Surubim open pit mine, and the Tucumã Project (formerly known as Boa Esperança), an IOCG-type copper project located in Pará, Brazil. The Company also owns 97.6% of NX Gold S.A. (“NX Gold”) which owns the Xavantina Operations (formerly known as the NX Gold Mine), comprised of an operating gold and silver mine located in Mato Grosso, Brazil. Additional information on the Company and its operations, including technical reports on the Caraíba Operations, Xavantina Operations and Tucumã Project, can be found on SEDAR+ at www.sedarplus.ca/landingpage/ and on EDGAR (www.sec.gov). The Company’s shares are publicly traded on the Toronto Stock Exchange and the New York Stock Exchange under the symbol “ERO”.