Lundin’s US$150M Caserones upgrade: heap leach and water strategy for mine engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Lundin Mining has filed for Chilean environmental approval for a US$150 million upgrade at the Caserones copper-molybdenum mine, aiming to maintain current production and fresh water use while extending operating continuity to 2039. The project adds new access roads, a fresh water reservoir, two backup sulphuric acid storage tanks, and a 90 Mt increase in heap leach capacity, while extending operations at the existing solvent extraction–electrowinning plant. Caserones currently processes about 84 Mt/a of ore with 100,000 t/d milling capacity and up to 35,000 t/a cathode output, but faces declining grades and lower production from 2027.
Technical Brief
- Environmental approval was filed on 6 January 2026 with Chile’s Environmental Evaluation Service via SCM Minera Lumina Copper.
- Permit conditions are proposed to keep all input and output volumes identical to the 2010 RCA.
- Declining Chilean ore grades are forecast to drop Caserones output to 105,000–115,000 t from 2027.
- The mine currently treats about 84 Mt of ore per year against an installed milling capacity of 100,000 t/d.
- Lundin drilled 18 km around Caserones in 2025 to support potential brownfield resource growth and future expansions.
- Caserones is integrated into Lundin’s Vicuña district strategy alongside Josemaría and Filo del Sol on the Chile–Argentina border.
- Group-wide, Lundin is targeting 500,000 t/a copper and ~550,000 oz/a gold within three to five years, mainly via brownfield expansions.
Our Take
With Caserones already processing about 84 Mt/a, a 90 Mt leach capacity boost signals a pivot to maximising metal recovery from lower-grade ore and stockpiles, which can materially improve unit costs without the permitting risk of a greenfield expansion in Chile’s Atacama Region.
Extending Caserones’ operating continuity to 2039 under a 70/30 Lundin–JX Advanced Metals ownership structure gives Japanese downstream users long-term copper and molybdenum exposure from Latin America, which is strategically valuable as AI-linked forecasts in our database point to copper demand potentially rising by around 50% by 2040.
The 18 km of drilling completed around Caserones in 2025, combined with nearby Lundin projects like Josemaría and Filo del Sol in the Vicuña district, suggests the company is de-risking a district-scale copper hub on the Chile–Argentina border rather than treating Caserones as a stand-alone asset.
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.
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.

