Exhibit 99.18

CONSENT OF ERIN L. PATTERSON

The undersigned hereby consents to the use of and references to her name in connection with the Technical Report Summary (TRS) listed below, and the information derived, summarized, quoted or referenced from the TRS, or portions thereof, that the undersigned prepared, supervised the preparation of and/or that was reviewed and approved by the undersigned, and that is incorporated by reference in Registration Statement No. 333-274097 on Form F-10 and in the Annual Report on Form 40-F of Ero Copper Corp., including in the Annual Information Form filed as an exhibit thereto, being filed with the United States Securities and Exchange Commission.

1.Technical Report on the Tucumã Project (formerly known as the Boa Esperança Project) entitled “Boa Esperança Project NI 43-101 Technical Report on Feasibility Study Update”, datedNovember 12, 2021 with an effective date of August 31, 2021 (TRS)

Yours truly,

/s/ Erin L. Patterson            

Erin L. Patterson, P.E.

Ausenco Engineering USA South Inc.

Dated: March 7, 2024