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SELMEXT

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Advanced selective metal extraction

 SELMEXT is Chromafora's technology platform for selectively separating metals from water and hydrometallurgical process streams.

The technology can be used to remove unwanted metals or recover valuable resources, with current development focused on gold, uranium, scandium and mercury.

Selectivity changes the process

Conventional metal treatment often separates several substances together, generating large amounts of sludge and potentially losing metals that still have economic value.

SELMEXT is designed around selective separation. The chemistry and process are adapted to the target metal and water matrix, allowing unwanted substances to be removed while other metals remain in solution – creating opportunities for both cleaner water and resource recovery.

Two objectives. One technology platform

Remove unwanted metals – selectively remove targeted metals from industrial water, mining effluents and other process streams, while limiting unnecessary separation.

Recover valuable metals – use the same selective approach to extract metals with economic or strategic value for further processing and reuse.

 

The SELMEXT process

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VALIDATED AT PILOT SCALE

A new approach to gold leaching and recovery

Chromafora has developed a process combining thiosulfate gold leaching with SELMEXT-based selective gold recovery – an alternative to conventional cyanide leaching.

The process has been tested and validated at pilot scale in cooperation with a Swedish gold mine, and is now being advanced towards system prototype demonstration.

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From laboratory to full scale

LAB
Laboratory-scale leaching and recovery testing for gold ores and concentrates, starting from approximately 100 grams of representative ground material.
PILOT
Pilot-scale campaigns of up to 2 tonnes per batch at Chromafora's testing facility in Sweden, replicating a future full-scale process as closely as possible.
FULL-SCALE
Delivered through a licensing model, with engineering and project implementation. Chromafora provides process support and SELMEXT chemistry.

Resources

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TS-Selmext Project Report
Executive summary of the three-year pilot with Björkdalsgruvan, validating cyanide-free gold extraction with strong recovery rates.

Download summary
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SELMEXT Product Info
Technology and system overview, from concentration principle to system integration.


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More SELMEXT applications

Uranium 

Selective extraction from uranium-contaminated water and process solutions. Currently at TRL 5, with field testing completed and further pilot development planned.

Scandium

Selective recovery from suitable mining wastewater and process streams. Currently at TRL 5, with laboratory testing available and pilot testing possible on request.

Mercury

Selective removal from gold-cyanide process solutions, without removing gold or silver. Currently at TRL 5. 

 Have a metal separation challenge? 

Whether the objective is removing an unwanted contaminant or recovering a valuable metal, the first step is understanding the material and the process. Chromafora offers laboratory testing and selected pilot programs to evaluate whether SELMEXT is suitable for your application.

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Technology insights

Chromafora appoints new Country Manager to drive growth in Denmark
Chromafora appoints new Country Manager to drive growth in Denmark
Press release Aug 6, 2026
Chromafora acquires Montrose Environmental Group Denmark
Chromafora acquires Montrose Environmental Group Denmark
Press release Jan 20, 2026
Thiosulfate Gold Leaching by Chromafora – High Yield and Low Costs Confirmed in Pilot
Thiosulfate Gold Leaching by Chromafora – High Yield, Low Costs
Press release Dec 29, 2025
Chromafora to tackle widespread chemical pollution with €22.5 million EU backing
EIB funding fuels Chromafora’s growth – strong performance in Q1 and Q2
Press release Jul 2, 2025
Chromafora recognized for award-winning breakthrough in PFAS treatment
Chromafora recognized for award-winning breakthrough in PFAS treatment
Press release Jun 16, 2025
MORE INSIGHTS