Ero Copper’s Furnas resource growth in Brazil: mine-life and PEA lens for engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
New drilling at Ero Copper’s Furnas polymetallic project in Pará, Brazil, has extended mineralisation up to 220 metres below and about 115 metres down dip beyond the current inferred resource, with hole FURN-DD-00357 returning 90 metres at 0.74% Cu, 0.5 g/t Au and 3.18 g/t Ag from 726 metres depth. The project’s February PEA outlines a 24-year mine life with average annual output of 52,000 tonnes Cu, 84,000 oz Au and 374,000 oz Ag, and Ero expects to complete earn-in spending under its Vale Base Metals agreement by year-end. Over 75,000 metres have now been drilled using 10 rigs, with the deposit remaining open at depth and along strike and a prefeasibility study targeted for 2027.
Technical Brief
- Hole FURN-DD-00357 includes a 32 m sub-interval grading 1.17% Cu, 0.68 g/t Au, 5.40 g/t Ag.
- Step-out hole FURN-DD-00354 intersected 45 m at 0.98% Cu, including 20 m at 1.78% Cu.
- FURN-DD-00354’s intercept sits ~80 m beyond the current inferred resource boundary in the Southeast zone.
- Central zone hole FURN-DD-00368 cut 41 m at 0.94% Cu, 0.44 g/t Au, 1.58 g/t Ag.
- FURN-DD-00368 was drilled ~220 m below the inferred resource and ~1.1 km west of the Southeast zone.
- Total drilling exceeds 75,000 m, with assays received for ~52,000 m and ~24,000 m in the latest release.
- Ten drill rigs are operating concurrently, indicating an aggressive resource-definition and step-out drilling campaign.
- Earn-in with Vale Base Metals allows Ero to reach 60% ownership by meeting exploration, engineering and development milestones within five years.
- Furnas is ~70 km southeast of Vale’s Salobo mine and ~190 km northeast of Ero’s Tucumã operation, benefiting from existing regional infrastructure.
- Management emphasises high-grade continuity in Northwest and Southeast corridors and proximity of Central zone mineralisation to planned infrastructure for mine planning flexibility.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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