Ivanhoe’s Kamoa-Kakula output cut: mine plan and reserve model shifts for engineers
Reviewed by Tom Sullivan
First reported on MINING.com
30 Second Briefing
Ivanhoe Mines has cut 2026 Kamoa-Kakula copper anode guidance to 290,000–330,000 tonnes (from 380,000–420,000 tonnes) and 2027 output to 380,000–420,000 tonnes (from 500,000–540,000 tonnes), after a new reserve model reduced contained copper by 24.7% and reserve grade by 28%. The mine plan now caps underground extraction at about 60% versus previous 70–80% assumptions, widens pillars, excludes inaccessible zones and prioritises 2026–27 development, rehabilitation and faster backfill sequencing, lifting cash costs. Ivanhoe still targets >500,000 tonnes per year from 2028, but its shares have fallen about 35% year-to-date, with BMO cutting its price target from $23 to $16.
Technical Brief
- Underground extraction is now limited by wider pillars and exclusion of geotechnically inaccessible zones for stability.
- Redevelopment in 2026–27 prioritises new access, rehabilitation and faster backfill sequencing over ore tonnage delivery.
- Revised reserve model incorporates more conservative geotechnical and sequencing assumptions plus lower cut-off grades.
- Operational challenges at Kakula are persisting longer than planned, delaying volume recovery beyond earlier ramp-up schedules.
- Ongoing optimisation includes additional geotechnical drilling and detailed analysis of Kakula East to refine the mine plan.
- Updated prefeasibility and feasibility studies for Kamoa-Kakula are scheduled for completion in Q1 2027.
- Jefferies and BMO both flag slower development advance rates and conservative sequencing as key ore-supply constraints.
Our Take
The 24.7% cut to contained copper reserves at Kamoa-Kakula comes only months after Ivanhoe started up the 500,000 tpa direct-to-blister smelter in the DRC, which means smelter utilisation and unit costs will now hinge more heavily on how quickly the constrained ore delivery over the next 18–24 months can be resolved.
In our database of 1211 Mining stories, Ivanhoe Mines appears frequently in the context of US ‘critical minerals’ policy and Project Vault discussions, so a 28% reserve-grade reduction at its flagship DRC copper complex is likely to sharpen scrutiny from policymakers and offtakers that had viewed Kamoa-Kakula as a cornerstone long-life supply source.
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.
Related Articles
Related Industries & Products
Mining
Geotechnical software solutions for mining operations including CMRR analysis, hydrogeological testing, and data management.
Tunnelling
Specialised solutions for tunnelling projects including grout mix design, hydrogeological analysis, and quality control.
CMRR-io
Streamline coal mine roof stability assessments with our cloud-based CMRR software featuring automated calculations, multi-scenario analysis, and collaborative workflows.
HYDROGEO-io
Comprehensive hydrogeological testing platform for managing, analysing, and reporting on packer tests, lugeon values, and hydraulic conductivity assessments.
GEODB-io
Centralised geotechnical data management solution for storing, accessing, and analysing all your site investigation and material testing data.