BHP Invent–MIT SiTration waste-stream metals: process and design notes for engineers
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
BHP Invent, MIT spinout SiTration and Copper South Australia have completed a 5‑week prototype trial of SiTration’s silicon‑based electrode electro‑extraction technology on local copper samples, targeting BHP copper and gold waste streams. The process recovered bullion‑grade gold at 99.99% purity and copper at 99.9% purity directly from dilute, chemically harsh residual liquids, using a simplified flowsheet. If scaled, the approach could cut processing reagents, energy and water use while making currently uneconomic low‑grade copper material recoverable.
Technical Brief
- SiTration’s patented silicon-based electrodes are engineered for durability in chemically harsh, low‑pH process liquors.
- Electro‑extraction cell is designed to treat dilute, complex multi‑ion solutions without prior concentration stages.
- Flowsheet simplification explicitly aims to cut reagent types, intermediate unit operations and associated OPEX.
- SiTration positions the technology as low‑cost, with potential retrofit into brownfield hydrometallurgical circuits.
- If scaled, similar electro‑extraction systems could extend economic cut‑off grades for copper waste stockpiles.
Our Take
BHP Invent’s work with SiTration on copper and gold waste streams sits alongside its MoUs with China ENFI and BGRIMM, signalling that BHP is building a diversified external tech pipeline for mineral processing rather than relying solely on in‑house R&D.
Achieving 99.9% copper and 99.99% gold purity from waste streams is strategically significant in a year when our database shows multiple copper and gold pieces framed around margin pressure, as it effectively turns tailings and low-grade residues into a higher‑quality, hedge‑like revenue source.
The inclusion of aluminium and a US$5.6 billion South32–Alcoa transaction in the same context underscores that waste-stream recovery tech could quickly become relevant beyond copper and gold, especially for large integrated operators in Australia and the US looking to sweat existing refining assets rather than build greenfield capacity.
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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