Ero Copper Corp.

MATERIAL CONTRACTS

Except for material contracts entered into in the ordinary course of business, set out below are material contracts to which the Company or any of its subsidiaries are a party, entered into prior to or since the date of incorporation of the Company and which still remain in effect and material to the Company. Copies of such material contracts are available for review under the Company’s profile on SEDAR+ at www.sedarplus.ca/landingpage/ or EDGAR at www.sec.gov.

•The Note Indenture referred to under the heading “Description of Capital Structure – Senior Unsecured Notes”.

•The 2023 Senior Credit Facility Agreement, as amended on November 2, 2023 and December 13, 2024, referred to under the heading “General Development and Business of the Company – Three Year History”.

•The Non-Priced Copper Prepayment Facility Agreement referred to under the heading “General Development and Business of the Company – Three Year History”.

•On June 29, 2021, the Company entered into a Precious Metals Purchase Agreement (the “NX Gold Stream Agreement”) with RGLD Gold AG (“RG AG”), a wholly owned subsidiary of Royal Gold, Inc., wherein the Company received total upfront cash consideration of US$100 million from RG AG in exchange for an amount equivalent to 25% of gold produced from the Xavantina Operations until 93,000 ounces of gold have been delivered, decreasing to 10% of gold produced over the remaining life of mine. RG AG will make ongoing payments equal to 20% of the prevailing spot gold price for each ounce of gold delivered until 49,000 ounces of gold have been received, after which it will pay 40% of the prevailing spot gold price for each ounce of gold delivered. An additional amount of up to US$10 million will be payable to the Company subject to certain performance conditions related to planned exploration drilling and increases to the Measured and Indicated Mineral Resources of the Xavantina Operations. RG AG shall also commit US$5 per ounce of gold delivered under the NX Gold Stream Agreement to support the Company’s environmental, social and governance commitments for the Xavantina Operations and surrounding communities.