Chile copper mines tie-up: project capex and operating synergies for engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
Chile’s Sierra Gorda mine and BHP’s Spence operation have signed a memorandum of understanding to explore joint supply-chain and operating-process initiatives in the Sierra Gorda district, targeting economies of scale as both operations confront declining grades and reduced output. Spence is progressing a US$600 million concentrator expansion, including a new flotation circuit to manage ore variability, after producing 254,795 tonnes of fine copper in 2025. Sierra Gorda plans an SX-EW heap-leach project for about 30,000 tonnes of copper cathode per year over 10 years, alongside a US$400 million tailings facility upgrade and a potential US$700 million fourth grinding-line expansion.
Technical Brief
- Memorandum of understanding targets joint optimisation of supply chains and operating processes in the Sierra Gorda district.
- Collaboration explicitly framed around managing low-grade ore mining while keeping operations economically viable.
- Spence concentrator expansion remains in design, prefeasibility and engineering phases, ahead of a 1H FY27 FID.
- New flotation circuit at Spence is specifically intended to counter ore variability driving down metallurgical recoveries.
- Sierra Gorda’s SX-EW plan focuses on currently stockpiled oxide ore, shifting waste inventory into revenue.
- Tailings storage upgrade at Sierra Gorda is a brownfield project, implying staged construction around live deposition.
- A potential fourth grinding-line expansion at Sierra Gorda is costed at roughly US$700 million.
- Ownership split is asymmetric: Sierra Gorda SCM (KGHM 55%, South32 45%) versus BHP’s 100% of Spence.
Our Take
The MoU between Spence and Sierra Gorda SCM reported on 9 June 2026 signals that BHP, KGHM and South32 are already testing shared technical and commercial models in Chilean copper, so any deeper tie-up would likely build on concrete collaboration pathways rather than start from scratch.
With BHP weighing a US$600 million concentrator expansion at Spence and KGHM/South32 advancing several hundred-million-dollar upgrades at Sierra Gorda, coordinated planning around power, water and logistics in Pampa Norte could materially shift the regional cost curve for Chilean copper operations.
KGHM’s parallel work on future copper concentrate supply deals, such as the Nowa Sól LOI highlighted in our database, suggests that any integration moves around Sierra Gorda may be paired with a broader strategy to secure long-term offtake flexibility across its copper portfolio.
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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