Diesel Particulate Matter in MiningPerth
Western Australia's underground gold, nickel, and lithium mines rely heavily on diesel-powered mobile equipment for production and development. The DMIRS Safety Regulation System database contains 24,459 DPM exposure data points — the most comprehensive DPM dataset in Australia. Published research (September 2025) concluded that the proposed WEL of 0.01 mg/m³ REC presents a significant compliance challenge, especially for underground mining operations where diesel-powered equipment remains prevalent.
Perth Local Context
WA underground gold mines in the Kalgoorlie-Boulder and Leonora regions operate large fleets of diesel LHDs and trucks in deep, hot, and poorly ventilated stopes where DPM concentrations routinely exceed the incoming WEL. The transition from submicron elemental carbon (SMEC) to respirable elemental carbon (REC) as the measurement standard creates methodological challenges — historical WA data measured as SMEC is not directly comparable to the new REC-based WEL. High-risk similar exposure groups identified in WA data include ground and roof support workers and long hole drill and blast crews. Nickel sulphide mines at Kambalda and Leinster face similar challenges with aging diesel fleets. The emerging lithium underground mines at Greenbushes and Pilgangoora are designing ventilation systems to meet the new WEL from commissioning. From December 2026, RPE protection factors can be factored into exposure assessments — a new provision that will change how compliance is reported. Battery-electric vehicle (BEV) adoption and alternative fuels (HVO) are accelerating but remain limited to select operations. FIFO occupational hygienists based in Perth deliver DPM monitoring campaigns at remote underground operations across the Goldfields and Pilbara.
WorkSafe WA / Department of Mines, Industry Regulation and Safety (DMIRS) Enforcement
Work Health and Safety (Mines) Regulations 2022, Work Health and Safety Act 2020 (WA), Mines Safety and Inspection Act 1994 (transitional)
Category 1 offence: up to $3.5M for a body corporate
Category 1 individual: up to $350,000 or 5 years imprisonment
DMIRS improvement notices for inadequate DPM management plans
Enforceable undertakings for repeated exceedances of guidance-level DPM limits
Major Project Types in Perth
Key Hazards
Primary exposure hazards requiring monitoring in Perth.
LHD and truck operations in underground declines
Load-haul-dump vehicles and underground haul trucks operating in decline and ramp systems generate the highest DPM concentrations in underground mines. Engine load factors during uphill haulage peak at 70-100% of rated power, producing maximum particulate emissions in the confined airway. Workers in LHD cabins, at truck loading points, and in decline refuge areas face chronic elevated exposure.
Development heading operations
Jumbos, charge-up vehicles, boggers, and agitator trucks operating sequentially in development headings create sustained DPM exposure for the development crew. Auxiliary ventilation duct systems may not provide sufficient fresh air to dilute DPM below the incoming WEL, particularly in long development drives exceeding 200 metres from the last ventilation junction.
Maintenance workshops underground
Underground workshops where diesel equipment is started, idled, and tested for maintenance and repair concentrate DPM in low-ventilation areas. Mechanics, electricians, and fitters working on diesel equipment in workshops face both acute and chronic DPM exposure from engine running during diagnostics and after repair testing.
Explosive loading and charge-up operations
Charge-up vehicles (ANFO loaders and emulsion pumpers) are typically diesel-powered and operate in dead-end development faces with limited ventilation. The charge-up crew works in close proximity to the running engine for extended periods while loading explosives into blast holes. Re-entry after blasting introduces residual DPM from pre-blast vehicle activity combined with blast fume gases.
Common Analytes
Substances typically included in occupational hygiene sampling proposals for this sub-category.
Typical Worker Groups
Common similar exposure groups (SEGs) assessed for this sub-category.
Regulatory Context
Safe Work Australia adopted a WEL of 0.01 mg/m³ for diesel particulate matter (measured as elemental carbon) effective 1 December 2026. This is a significant reduction from the previously guidance-only level of 0.1 mg/m³ used in some jurisdictions. State mines inspectorates require DPM monitoring as part of principal hazard management plans for underground mines. Mines must demonstrate a DPM management plan that includes fleet emissions testing, ventilation modelling, maintenance scheduling, and personal exposure monitoring. DMIRS in WA and RSHQ in QLD have both issued guidance on transitioning to the new WEL.
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