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    Johnson Matthey DPFi CSA approval: diesel retrofit implications for mine engineers

    March 31, 2026|

    Reviewed by Joe Ashwell

    First reported on International Mining – News

    30 Second Briefing

    Johnson Matthey’s DPFi electrically regenerating diesel particulate filter has secured Canadian Standards Association (CSA) certification for underground mining and tunnelling, adding to existing approvals from Canmet Materials and a third independent body. The system uses active electrical regeneration rather than exhaust heat to burn off soot, enabling tighter control of backpressure and emissions on diesel equipment operating in confined headings. CSA certification gives mine operators a recognised safety benchmark for retrofitting diesel fleets to meet stringent underground particulate limits in Canada.

    Technical Brief

    • System is targeted at underground mining and tunnelling fleets where ventilation capacity limits diesel particulate exposure.
    • Independent third-party certification provides a documented basis for mine ventilation and exposure modelling assumptions.
    • For similar diesel control projects, multi-agency certification is becoming a de facto requirement for safety sign-off.

    Our Take

    Johnson Matthey also features in our coverage for its hydrogen gigafactory project in Hertfordshire, where worker-safety disputes have been prominent, suggesting the company’s mining-focused DPFi™ certification in Canada may be leveraged to reinforce its wider safety credentials across industrial projects.

    Because this certification is Canada-specific, operators with cross-border fleets running into and out of Canada will need to consider how DPFi™ fits alongside MSHA or other regional diesel particulate standards, potentially standardising on a single filter system to simplify maintenance and compliance documentation.

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    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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