Fortescue arsenic removal tech: planning and processing lens for copper mines
Reviewed by Tom Sullivan

First reported on International Mining – News
30 Second Briefing
Fortescue has sold more than 40 t of copper concentrate treated with its patented Toowong Process, a low-temperature, low-pressure hydrometallurgical route that removes arsenic from complex copper feeds. The technology, acquired in 2022, targets high-arsenic concentrates that typically attract penalties or blending constraints in smelters, potentially converting currently marginal or stranded ores into saleable product. For mine planners and process engineers, this signals scope to re‑evaluate arsenic-bearing resources, concentrate specifications, and off‑take strategies without major changes to existing smelting infrastructure.
Technical Brief
- Hydrometallurgical circuit selectively dissolves arsenic from copper concentrate, enabling phase separation rather than bulk oxidation.
- Process targets “complex” copper feeds with deleterious arsenic, addressing smelter acceptance and regulatory compliance constraints.
- Low-temperature operation reduces thermal energy demand compared with roasting or high-temperature oxidative treatments.
- Low-pressure design simplifies containment and materials-of-construction requirements relative to pressure leach systems.
- Similar hydrometallurgical arsenic removal could extend mine life at deposits currently constrained by impurity specifications.
Our Take
In our database of 1262 Mining stories, Fortescue appears far more often in iron ore and power infrastructure pieces (such as the ABB power conversion system at North Star Junction) than in copper, so deploying the Toowong Process signals a deliberate move to diversify its technical footprint into complex copper concentrates.
Because arsenic is explicitly flagged alongside copper in the related concentrate-sale article, scalable arsenic removal gives Fortescue optionality to bid on or JV into copper assets that majors like BHP, Rio Tinto or Freeport-McMoRan might currently discount due to deleterious-element penalties.
The 2022 acquisition date for the Toowong Process, combined with Fortescue’s broader sustainability‑tagged initiatives (including Fortescue Zero’s Formula E move), suggests the company is using decarbonisation and impurity‑management technologies as a branding and permitting lever for future copper project approvals.
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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