Ero Copper Publicizes Preliminary NI 43-101 Mineral Useful resource Estimate for the Furnas Copper-Gold Venture

Ero Copper Corp. (TSX: ERO, NYSE: ERO) (“Ero” or the “Firm”) is happy to announce an preliminary Nationwide Instrument 43-101 (“NI 43-101”) compliant mineral useful resource estimate for the Furnas Copper-Gold Venture (“Furnas” or the “Venture”), situated within the Carajás Mineral Province (“Carajás”) in Pará State, Brazil.

The preliminary mineral useful resource estimate highlights vital potential for the Venture. At a 1.00% copper equal (“CuEq”) cut-off grade, the mineral useful resource estimate, efficient June 30, 2024, totals:

• Indicated Mineral Useful resource: 35.2 million tonnes grading 1.04% copper and 0.69 grams per tonne (“gpt”) gold (1.36% CuEq ¹ ), containing an estimated 364,700 tonnes of copper and 775,300 ounces of gold
• Inferred Mineral Useful resource: 61.3 million tonnes grading 1.06% copper and 0.63 gpt gold (1.36% CuEq ¹ ), containing an estimated 647,400 tonnes of copper and 1,235,600 ounces of gold

This estimate is supported by greater than 90,000 meters of historic drilling on the Venture, performed by Vale S.A. and Anglo American plc, in addition to a resampling and database validation program undertaken by the Firm.

“We’re extraordinarily happy with this preliminary mineral useful resource estimate for Furnas. It supplies a stable basis upon which we are able to focus, over the approaching months, on unlocking additional potential,” stated David Strang, Chief Govt Officer. “Our Part 1 drill program will goal two key aims: bettering the definition of high-grade zones by infill drilling and increasing identified mineralization inside these zones past the traditionally drilled depth of roughly 300 vertical meters from floor.

“Furnas presents an amazing alternative to outline a serious copper-gold mineral useful resource able to supporting a large-scale underground mine. Our expertise in underground   mining in Brazil, coupled with the profitable development of our new Tucumã mine and processing plant within the Carajás, positions us properly to advance this Venture.

“Along with our companions at Vale Base Metals, we’re dedicated to progressing Furnas in   a fashion that delivers sustainable advantages for all stakeholders and reinforces Brazil’s   place as a worldwide chief within the accountable, low-carbon manufacturing of important minerals.”

^{1. CuEq grade calculated as Cu grade + (Au grade x 0.03215 x ($1,900 gold worth x 61.50% gold metallurgical restoration / (0.01 x $9,259/tonne copper worth x 85.00% copper metallurgical restoration)).}

MINERAL RESOURCE ESTIMATE AND CUT-OFF GRADE   SENSITIVITY

<sup>Word: The Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Definition Requirements (2014) had been used for reporting Mineral Assets, that are efficient as at June 30, 2024 and offered on a 100% possession foundation. All figures have been rounded to mirror the relative accuracy of the estimates. Summed quantities might not add resulting from rounding. Mineral sources that aren’t mineral reserves should not have a demonstrated financial viability. See “Notes on Mineral Assets” under for added technical and scientific info.
1. CuEq grade calculated as Cu grade + (Au grade x 0.03215 x ($1,900 gold worth x 61.50% gold metallurgical restoration / (0.01 x $9,259/tonne copper worth x 85.00% copper metallurgical restoration)).</sup>

In September 2024, the Firm obtained drilling permits from the Pará State environmental company, permitting for the graduation of the Part 1 drill program in October 2024. This minimal 28,000-meter program will deal with two recognized high-grade zones – the NW and SE Zones – throughout the broader deposit. This system is designed to assist a preliminary financial evaluation on the Venture. The drill plan contains:

• Infill drilling to improve inferred mineral sources and enhance continuity of the high- grade zones
• Extensional drilling to depth, the place restricted prior drilling suggests rising grade and thickness

FURNAS COPPER-GOLD PROJECT DETAILS AND EARN-IN   AGREEMENT

Furnas is an iron oxide copper-gold deposit situated roughly 50 kilometers southeast of Vale Base Metallic’s (“VBM”) Salobo operations and roughly 190 kilometers northeast of Ero’s Tucumã Operations. Protecting an space of roughly 2,400 hectares, the Venture sits inside fifteen kilometers of intensive regional infrastructure, together with paved roads, an industrial-scale cement plant, an influence substation and Vale S.A.’s railroad loadout facility.

In July 2024, the Firm signed a definitive earn-in settlement (“Settlement”) with Salobo Metais S.A, a subsidiary of VBM, to earn a 60% curiosity within the Venture upon completion of a number of exploration, engineering and improvement milestones over a five-year interval. In change for its 60% curiosity, Ero will solely fund a phased work program throughout the earn-in interval and grant VBM as much as an 11.0% “free carry” on future Venture development capital expenditures. For extra particulars on the important thing phrases and execution of the Settlement, please discuss with the Firm’s press releases dated October 30, 2023 and July 22, 2024.

NOTES ON MINERAL   RESOURCES

CIM Definition Requirements (2014) had been used for reporting mineral sources, that are efficient as at June 30, 2024 and offered on a 100% possession foundation. All figures have been rounded to the relative accuracy of the estimates. Summed quantities might not add resulting from rounding. Mineral sources that aren’t mineral reserves should not have a demonstrated financial viability.

Mineral useful resource estimates are ready by or underneath the supervision of and verified by Mr. Cid Gonçalves Monteiro Filho, SME RM (04317974), MAIG (No. 8444), FAusIMM (No. 329148). Mr. Monteiro is Useful resource Supervisor of the Firm and is a “certified individual” throughout the meanings of NI 43-101.

Mineral sources have been estimated utilizing a copper worth of US$9,259/tonne, a gold worth of US$1,900/oz, a USD:BRL international change fee of 5.10, and copper and gold metallurgical restoration charges of 85.00% and 61.50%, respectively. The estimation was constrained utilizing Datamine’s Mineable Form Optimizer (“MSO”) at a 0.55% break-even copper cut-off grade. Mineral sources had been estimated utilizing extraordinary kriging inside a 25-meter by 25-meter by 4- meter block measurement (X, Y, Z), with a minimal sub-block measurement of 6.25 meters by 6.25 meters by
2.0 meters.

QUALIFIED PERSONS AND THE NI 43-101 TECHNICAL   REPORT

Mr. Cid Gonçalves Monteiro Filho, SME RM (04317974), MAIG (No. 8444), FAusIMM (No. 329148) has reviewed, verified and authorised the scientific and technical info contained on this press launch, together with the sampling, analytical and take a look at knowledge underlying the data contained on this press launch. Mr. Monteiro is Useful resource Supervisor of the Firm and is a “certified individual” throughout the meanings of NI 43-101.

The Firm will file the related NI 43-101 compliant report on SEDAR+ ( www.sedarplus.ca/landingpage/) and EDGAR ( www.sec.gov), and publish this report on the Firm’s web site ( www.erocopper.com), inside 45 days of this press launch.

QUALITY ASSURANCE & QUALITY   CONTROL

4 diamond exploration drilling campaigns had been beforehand carried out on Furnas, with management pattern protocols utilized to every marketing campaign. Historic QA/QC knowledge was evaluated, together with duplicates, blanks and customary samples from the latest drilling marketing campaign.

In all drilling campaigns, 1 / 4 of the recovered core pattern was collected. Within the first three exploration campaigns, one-meter sampling intervals had been predominately used. Within the fourth exploration marketing campaign one-meter sampling intervals had been predominately used within the mineralized zone and two-meter sampling intervals had been used within the transition zone and in waste rock.

Bodily preparation of the quarter-core samples was carried out within the following laboratories: Vale/Carajás, Intertek-Parauapebas-PA, Intertek-Nova Lima-MG, SGS GEOSOL, or Lakefield-Geosol. Chemical evaluation was carried out by ACME, Lakefield-Geosol in Belo Horizonte/MG, and SGS Geosol Laboratories in Vespasiano/MG. The number of analytical strategies and the variety of components analyzed different throughout exploration campaigns.

To confirm the accuracy of older sampling campaigns, a autopsy QA/QC program was carried out on copper and gold for choose assay intervals. The autopsy program undertaken by the Firm demonstrates good efficiency, significantly for copper and gold, permitting for the inclusion of historic exploration marketing campaign knowledge for the needs of this press launch.

The Firm reprocessed all historic QA/QC knowledge from the Venture, in line with the Firm’s inside pointers, and achieved distinctive outcomes aligned with business requirements. Error charges for pulp and coarse duplicates remained considerably under the standard restrict of 10%, demonstrating the effectiveness of historic knowledge preparation and analytical procedures. International biases throughout all drilling phases and laboratories stayed properly inside acceptable parameters, confirming the analytical accuracy of the first laboratories related to the historic database. Moreover, the absence of great contamination in all laboratories additional validates the reliability and integrity of the reprocessed knowledge.

ABOUT ERO COPPER   CORP

Ero is a high-margin, high-growth, low carbon-intensity copper producer with operations in Brazil and company headquarters in Vancouver, B.C. The Firm’s main asset is a 99.6% curiosity within the Brazilian copper mining firm, Mineração Caraíba S.A. (“MCSA”), 100% proprietor of the Firm’s Caraíba Operations (previously generally known as the MCSA Mining Complicated), that are situated within the Curaçá Valley, Bahia State, Brazil and embody the Pilar and Vermelhos underground mines and the Surubim open pit mine, and the Tucumã Operation (previously generally known as Boa Esperança), an open pit copper mine situated in Pará, Brazil. The Firm additionally owns 97.6% of NX Gold S.A. (“NX Gold”) which owns the Xavantina Operations (previously generally known as the NX Gold Mine), comprised of an working gold and silver mine situated in Mato Grosso, Brazil. Further info on the Firm and its operations, together with technical reviews on the Caraíba Operations, Xavantina Operations and Tucumã Operation, could be discovered on SEDAR+ ( www.sedarplus.ca/landingpage/) and on EDGAR ( www.sec.gov). The Firm’s shares are publicly traded on the Toronto Inventory Trade and the New York Inventory Trade underneath the image “ERO”.

FOR MORE INFORMATION, PLEASE   CONTACT

Courtney Lynn, SVP, Company Improvement, Investor Relations & Sustainability
(604) 335-7504
information@erocopper.com

CAUTION REGARDING FORWARD LOOKING INFORMATION AND STATEMENTS

This press launch accommodates “forward-looking statements” throughout the that means of the USA Personal Securities Litigation Reform Act of 1995 and “forward-looking info” throughout the that means of relevant Canadian securities laws (collectively, “forward-looking statements”). Ahead-looking statements embody statements that use forward-looking terminology equivalent to “might”, “may”, “would”, “will”, “ought to”, “intend”, “goal”, “plan”, “anticipate”, “finances”, “estimate”, “forecast”, “schedule”, “anticipate”, “consider”, “proceed”, “potential”, “view” or the unfavourable or grammatical variation thereof or different variations thereof or comparable terminology. Ahead-looking statements might embody, however aren’t restricted to, statements with respect to Ero’s skill, in partnership with VBM, to create worth at and/or maximize the worth of the Venture; Ero’s skill to efficiently design an financial high-grade underground mine or different improvement and working situation for Furnas; Ero’s skill to begin and full the required 28,000 meters of drilling throughout the 18-month Part 1 work program; and another assertion that will predict, forecast, point out or indicate future plans, intentions, ranges of exercise, outcomes, efficiency or achievements.

Ahead-looking statements aren’t a assure of future efficiency. There could be no assurance that forward-looking statements will show to be correct, as precise outcomes and future occasions may differ materially from these anticipated in such statements. Ahead-looking statements contain statements concerning the future and are inherently unsure, and the Firm’s precise outcomes, achievements or different future occasions or circumstances might differ materially from these mirrored within the forward-looking statements resulting from a wide range of dangers, uncertainties and different elements, together with, with out limitation, these referred to herein and within the Firm’s most up-to-date Annual Info Type underneath the heading “Danger Elements”.

The Firm’s forward-looking statements are based mostly on the assumptions, beliefs, expectations and opinions of administration on the date the statements are made, lots of which can be troublesome to foretell and past the Firm’s management. In reference to the forward-looking statements contained on this press launch and within the AIF, the Firm has made sure assumptions about, amongst different issues: continued effectiveness of the measures taken by the Firm to mitigate the attainable affect of COVID-19 on its workforce and operations; beneficial fairness and debt capital markets; the power to boost any essential extra capital on cheap phrases to advance the manufacturing, improvement and exploration of the Firm’s properties and property; future costs of copper, gold and different metallic costs; the timing and outcomes of exploration and drilling packages; the accuracy of any mineral reserve and mineral useful resource estimates; the geology of the Caraíba Operations, the Xavantina Operations and the Tucumã Venture being as described within the respective technical report for every property; manufacturing prices; the accuracy of budgeted exploration, improvement and development prices and expenditures; the value of different commodities equivalent to gas; future forex change charges and rates of interest; working circumstances being beneficial such that the Firm is ready to function in a secure, environment friendly and efficient method; work pressure persevering with to stay wholesome within the face of prevailing epidemics, pandemics or different well being dangers (together with COVID-19), political and regulatory stability; the receipt of governmental, regulatory and third social gathering approvals, licenses and permits on beneficial phrases; acquiring required renewals for current approvals, licenses and permits on beneficial phrases; necessities underneath relevant legal guidelines; sustained labour stability; stability in monetary and capital items markets; availability of apparatus; constructive relations with native teams and the Firm’s skill to satisfy its obligations underneath its agreements with such teams; and satisfying the phrases and circumstances of the Firm’s present mortgage preparations. Though the Firm believes that the assumptions inherent in forward-looking statements are cheap as of the date of this press launch, these assumptions are topic to vital enterprise, social, financial, political, regulatory, aggressive and different dangers and uncertainties, contingencies and different elements that might trigger precise actions, occasions, circumstances, outcomes, efficiency or achievements to be materially totally different from these projected within the forward-looking statements. The Firm cautions that the foregoing record of assumptions will not be exhaustive. Different occasions or circumstances may trigger precise outcomes to vary materially from these estimated or projected and expressed in, or implied by, the forward-looking statements contained on this press launch. There could be no assurance that forward-looking statements will show to be correct, as precise outcomes and future occasions may differ materially from these anticipated in such statements. Accordingly, readers shouldn’t place undue reliance on forward-looking statements.

Ahead-looking statements contained herein are made as of the date of this press launch and the Firm disclaims any obligation to replace or revise any forward-looking assertion, whether or not on account of new info, future occasions or outcomes or in any other case, besides as and to the extent required by relevant securities legal guidelines.

CAUTIONARY NOTES REGARDING MINERAL RESOURCE AND MINERAL RESERVE ESTIMATES

Until in any other case indicated, all reserve and useful resource estimates included on this press launch and the paperwork included by reference herein have been ready in accordance with Nationwide Instrument 43-101, Requirements of Disclosure for Mineral Tasks (“NI 43-101”) and the Canadian Institute of Mining, Metallurgy and Petroleum (the “CIM”) — CIM Definition Requirements on Mineral Assets and Mineral Reserves, adopted by the CIM Council, as amended (the “CIM Requirements”). NI 43-101 is a rule developed by the Canadian Securities Directors that establishes requirements for all public disclosure an issuer makes of scientific and technical info regarding mineral tasks. Canadian requirements, together with NI 43-101, differ considerably from the necessities of the USA Securities and Trade Fee (the “SEC”), and reserve and useful resource info included herein is probably not akin to related info disclosed by U.S. firms. Specifically, and with out limiting the generality of the foregoing, this press launch and the paperwork included by reference herein use the phrases “measured sources,” “indicated sources” and “inferred sources” as outlined in accordance with NI 43-101 and the CIM Requirements.

Additional to latest amendments, mineral property disclosure necessities in the USA (the “U.S. Guidelines”) are ruled by subpart 1300 of Regulation S-Ok of the U.S. Securities Act of 1933, as amended (the “U.S. Securities Act”) which differ from the CIM Requirements. As a international non-public issuer that’s eligible to file reviews with the SEC pursuant to the multi-jurisdictional disclosure system (the “MJDS”), Ero will not be required to supply disclosure on its mineral properties underneath the U.S. Guidelines and can proceed to supply disclosure underneath NI 43-101 and the CIM Requirements. If Ero ceases to be a international non-public issuer or loses its eligibility to file its annual report on Type 40-F pursuant to the MJDS, then Ero might be topic to the U.S. Guidelines, which differ from the necessities of NI 43-101 and the CIM Requirements.

Pursuant to the brand new U.S. Guidelines, the SEC acknowledges estimates of “measured mineral sources”, “indicated mineral sources” and “inferred mineral sources.” As well as, the definitions of “confirmed mineral reserves” and “possible mineral reserves” underneath the U.S. Guidelines at the moment are “considerably related” to the corresponding requirements underneath NI 43-101. Mineralization described utilizing these phrases has a better quantity of uncertainty as to its existence and feasibility than mineralization that has been characterised as reserves. Accordingly, U.S. buyers are cautioned to not assume that any measured mineral sources, indicated mineral sources, or inferred mineral sources that Ero reviews are or might be economically or legally mineable. Additional, “inferred mineral sources” have a better quantity of uncertainty as to their existence and as as to whether they are often mined legally or economically. Below Canadian securities legal guidelines, estimates of “inferred mineral sources” might not type the premise of feasibility or pre-feasibility research, besides in uncommon instances. Whereas the above phrases underneath the U.S. Guidelines are “considerably related” to the requirements underneath NI 43-101 and CIM Requirements, there are variations within the definitions underneath the U.S. Guidelines and CIM Requirements. Accordingly, there is no such thing as a assurance any mineral reserves or mineral sources that Ero might report as “confirmed mineral reserves”, “possible mineral reserves”, “measured mineral sources”, “indicated mineral sources” and “inferred mineral sources” underneath NI 43-101 could be the identical had Ero ready the reserve or useful resource estimates underneath the requirements adopted underneath the U.S. Guidelines.