BHP–MIT SiTration copper recovery trial at Copper Cities: process notes for engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
BHP and MIT spinout SiTration are piloting a chemical-free copper recovery technology at the historic Copper Cities mine in Arizona, targeting legacy mining water in a pit lake at a site that produced nearly 400,000 tonnes of copper between the 1950s and early 1980s. An initial one‑month pilot will validate continuous, autonomous production, followed by a larger two‑month deployment aiming to produce up to 2 tonnes of LME Grade A copper cathode. Bench tests using real site feedstock report sub‑3–4 kWh/kg energy use with no new waste streams, signalling potential low‑cost recovery from mining‑impacted waters across the US Southwest.
Technical Brief
- Pilot deployments are located in the Globe–Miami mining district at BHP’s historic Copper Cities site.
- Copper Cities operated from the 1950s to early 1980s, yielding nearly 400,000 tonnes of copper.
- Bench-scale trials using actual Copper Cities feedstock have already produced LME Grade A cathode.
- Preliminary energy demand for copper recovery from this water is reported below 3–4 kWh per kg.
- CEO Brendan Smith estimates legacy waters in the American Southwest contain copper worth “billions of dollars”.
Our Take
BHP’s work with SiTration at the Copper Cities site aligns with its broader push into low-capital-intensity copper growth noted in our recent coverage, suggesting the major is looking to unlock sub‑economic or legacy material rather than rely solely on greenfield tonnes.
The projected 70% rise in global copper demand by 2050, combined with the roughly 50% copper price surge highlighted in the 19 August 2026 market piece, underlines why technologies that can recover metal from diluted legacy waters in Arizona’s Globe‑Miami district are likely to be scrutinised for scalability and cost per kilogram.
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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