Ero Copper Intercepts 115 Meters at 0.98% CuEq Superscript 1 in Deepest Hole Drilled to Date at Furnas Copper-Gold Project - Phase 2 Drill Program to be Completed in Early Q4 2025

Executive Summary

• Ero Copper released the remaining assay results from its 28,000‑m Phase 1 drill program at the Furnas Cu‑Au project in Brazil, highlighting multiple high‑grade intercepts (>1 % CuEq) that extend mineralization to ~950 m down‑dip.
• Key holes (e.g., FURN‑DD‑00322, ‑00305, ‑00321, ‑00300) returned >100 m of continuous mineralization with Cu grades up to 1.67 % and Au up to 0.71 g/t, supporting conversion of the existing resource and underpinning a forthcoming NI 43‑101 update and PEA slated for H1 2026.
• The company now has eight drill rigs on site and expects to finish the 17,000‑m Phase 2 program in early Q4 2025—about three months ahead of schedule—maintaining momentum toward a 45,000‑m Phase 3 program.

Key Details

• FURN‑DD‑00322 (Southeast zone): 115 m @ 0.76 % Cu & 0.47 g/t Au (0.98 % CuEq); includes 46 m @ 0.81 % Cu & 0.56 g/t Au (1.11 % CuEq) and 28 m @ 0.91 % Cu & 0.71 g/t Au (1.25 % CuEq). Deepest hole in SE zone, drilled ~950 m down‑dip.
• FURN‑DD‑00305: 103 m @ 0.88 % Cu & 0.80 g/t Au (1.26 % CuEq); includes 27 m @ 1.04 % Cu & 1.18 g/t Au (1.60 % CuEq). Demonstrates continuity of high‑grade envelope.
• FURN‑DD‑00321 (Northwest zone): 115 m @ 0.47 % Cu & 0.27 g/t Au (0.60 % CuEq); includes 8 m @ 1.13 % Cu & 0.49 g/t Au (1.36 % CuEq). Deepest NW hole (~650 m down‑dip).
• FURN‑DD‑00300: 80 m @ 1.02 % Cu & 0.36 g/t Au (1.19 % CuEq); includes 28 m @ 1.67 % Cu & 0.49 g/t Au (1.90 % CuEq). Supports resource conversion.
• Overall Phase 1 Highlights: Intercepts >100 m with CuEq ≥0.98 %; mineralization now confirmed to ~950 m down‑dip, extending beyond the historic average drill depth of 300 m and the prior maximum of 580 m.
• Future Work: Updated NI 43‑101 compliant resource estimate and Preliminary Economic Assessment (PEA) expected H1 2026; Phase 2 (17,000 m) to be completed early Q4 2025; Phase 3 (≈45,000 m) planned thereafter with ongoing engineering studies.
• Operational Status: Eight drill rigs operating on site; drilling contractors are Major Drilling Group International Inc. and Drillgeo Geologia e Sondagem Ltda.; QA/QC program follows NI 43‑101 standards with ~16 % QC sample rate.
• Qualified Person: Cid Gonçalves Monteiro Filho, SME RM, reviewed and approved the technical information.

Notable Quotes

“The full results from the 28,000‑meter Phase 1 drill program are highly encouraging and reinforce the potential for Furnas to be a large‑scale, long‑life, high‑grade copper and gold mining operation… that will fundamentally transform the Company.” – Makko DeFilippo, President & CEO

“We are well‑positioned to continue building momentum with eight drill rigs on site supporting Phase 3 and ongoing engineering studies.” – Makko DeFilippo, President & CEO