Cabral Gold’s Cuiú Cuiú discovery: resource and capex takeaways for mine planners
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Drilling at Cabral Gold’s Cuiú Cuiú project in Pará, northern Brazil, has defined a new mineralised zone at the Jerimum Cima target, with hole DDH411 cutting 8.9 metres grading 5.8 g/t gold from 208 metres, including 1.8 metres at 28.4 g/t, about 200 metres south of the main zone. Previous Jerimum Cima drilling included DDH385 with 9.5 metres at 87.4 g/t, and the zone remains open east–west and at depth as Cabral collects data for an initial resource. A 2023 prefeasibility study for Cuiú Cuiú outlined 113,000 oz output over 6.2 years via a heap leach oxide starter pit at Moreira Gomes, with US$37.7 million initial capex, 10‑month payback, and a 78% post‑tax IRR at US$2,500/oz, with first gold pour targeted for September.
Technical Brief
- Highlight hole DDH393 intersected 9.3 m at 2.78 g/t Au from 207 m downhole.
- DDH393 includes internal intervals of 10.2 m at 1.0 g/t and 1.7 m at 7.2 g/t Au.
- Hole DDH396 returned 8.9 m at 0.5 g/t Au from 195.6 m depth.
- DDH396 also contains 11.1 m grading 0.58 g/t Au, indicating broader low-grade halo mineralisation.
- Jerimum Cima drilling is explicitly targeting both gold-in-oxide blanket and underlying primary sulphide zones.
- Cuiú Cuiú’s current resource stands at 13.6 Mt indicated at 0.5 g/t Au (216,182 oz).
- Inferred resources add 6.4 Mt at 0.34 g/t Au for 70,570 oz contained gold.
- Cabral is concurrently drilling Machichie Main and Machichie West to support a global resource update this year.
- Regional context includes historic artisanal placer output of 1.5–2 Moz from Cuiú Cuiú within a 20–30 Moz Tapajós rush.
Our Take
The very high-grade DDH385 intercept at Jerimum Cima contrasts with the relatively low average grades in Cuiú Cuiú’s current indicated and inferred resources, suggesting upside for a future resource update if these narrow high-grade zones can be shown to have continuity and reasonable mining widths.
A post-tax IRR of 78% and a 10‑month payback on just US$37.7 million of initial capex place Cuiú Cuiú at the aggressive end of project economics in our gold database, but the short 6.2‑year mine life means Cabral Gold will be under pressure to convert additional targets like Machichie West and Moreira Gomes into reserves to sustain any future operation.
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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