Ero Copper Corp. provides a quarterly update on the ongoing exploration programs for its 99.6% owned MCSA Mining Complex located in Bahia State, Brazil and its 97.6% owned NX Gold Mine located in Mato Grosso State, Brazil. This update encompasses drill and assay results received from mid-June through the end of September 2021 ahead of the Company's 2021 National Instrument 43-101, Standards of Disclosure for Mineral Projects ("NI 43-101") compliant resource and reserve updates for the MCSA Mining Complex and the NX Gold Mine, expected to be completed prior to year-end. Exploration activities at Lagoa da Mina, part of the past-producing Angicos Mine, continued to undertake wide-spaced step-out drilling beyond the previously identified high-grade zone of mineralization located approximately 70 meters beneath the historic open pit. New drill results indicate the zone of high-grade mineralization extends an additional 200 meters down-plunge and remains open to depth. Results are highlighted by: FLM-94: 16.0 meters at 1.18% Cu and 24.0 meters at 1.54% Cu, including 11.0 meters at 2.30% Cu (intercept located 250 meters down-plunge from previously announced hole FLM-77 that intercepted 32.2 meters at 2.69% Cu, including 6.0 meters at 4.00% Cu). There are currently twenty-four drill rigs working throughout the Curaçá Valley, including six drill rigs allocated to regional exploration. Nine drill rigs are operating at NX Gold and the Company now has four drill rigs operating at the Boa Esperança project in Pará State. Exploration activities during the period continued to advance target zones and new mineral systems within each of the Company’s core exploration programs. These programs are focused on developing a portfolio of assets in parallel with potential to meaningfully augment each phase of the Company’s life- of-mine production plans from the near to medium-term and over the long-term at both the MCSA Mining Complex and the NX Gold Mine. Exploration activities within the Deepening Extension remain focused on upgrading high-grade zones of Inferred mineral resources through infill drilling as well as further extending the known limits of mineralization to depth. Deepening Extension drilling is currently targeting mineralization on the East Limb of the Pilar Mine to level -1550 approximately 1,200 to 2,000 meters below surface. Current development within the mine has been completed to level -1000.