Diesel particulate matter remains one of the most complex airborne hazards in underground mining. It is often treated as a number on a report, but the particles themselves tell a much richer story about engines, ventilation, maintenance, fuel, work practices and the mine environment.

This presentation will unpack what diesel particulate matter really looks like in mining environments and why it is measured the way it is. It will explain, in practical terms, why sampling methods use a submicron size-selective approach, why elemental carbon and total carbon are used as measurement indicators, and why results need to be interpreted with an understanding of the mine setting. In coal mines, this is particularly important because coal dust, organic carbon and other fine particles can influence what is collected and how results are understood.

The presentation will use particle-by-particle characterisation to show how diesel particulate behaves in real mining atmospheres. Rather than existing as neat, isolated particles, diesel particulate can occur as very fine agglomerates, mix with other mine dusts, and vary depending on equipment, controls and operating conditions. This matters because exposure monitoring is not just about compliance. It is about understanding what workers are breathing and whether controls are targeting the particles of greatest concern.

The presentation will also discuss current research aimed at improving diesel particulate assessment, including advanced microscopy, automated particle recognition and AI-enabled identification of diesel particulate in complex mixed dust samples. These methods are being developed to better distinguish diesel particulate from other respirable particles and support more meaningful interpretation of exposure data.

For operators, the key message is practical: better measurement should lead to better decisions. Understanding what is being measured, what may influence the result, and what future tools may offer can help sites move from simply collecting exposure data to using that data to improve controls, maintenance strategies and worker health protection.

Mobile equipment remains a major contributor to health and safety risk in surface mining, particularly through whole body vibration, impact loading, fatigue and catastrophic loss of control events. Conventional ITR systems are long established but rely heavily on administrative controls, inspection regimes and human intervention to manage inherent stored energy and failure risks.

This presentation examines the dynamic performance differences between conventional inflated tyre/rim assemblies and the ASW, reframing the comparison through a regulator and critical risk control lens. The ASW replaces inflation based load management with a mechanically constrained air suspension system, fundamentally changing how dynamic loads, transient impacts and vibration are absorbed and transmitted to the machine and operator.

From a production perspective, the ASW enables more consistent machine performance by stabilising wheel ground interaction and reducing dynamic load variability across haul conditions. Predictable suspension behaviour supports higher sustained operating speeds on uneven haul roads while reducing shock related stress on wheel end, suspension and chassis components. The elimination of inflation dependent variability reduces unplanned downtime associated with tyre failures and pressure management, improving equipment availability, maintenance efficiency and overall production reliability without increasing operator workload or procedural complexity.

From a health perspective, the ASW demonstrates reduced transmission of peak shock loads and high frequency vibration, supporting improved exposure management for whole body vibration and operator fatigue. More predictable dynamic behaviour contributes to improved operator confidence, situational awareness and psychological safety.

From a safety systems perspective, the ASW represents a shift towards higher order controls by eliminating key tyre related failure modes associated with rim failures, sudden pressure loss and uncontrolled energy release. This reduces reliance on procedural controls and frequent high risk maintenance interventions, aligning with regulatory expectations for engineered risk reduction and effective critical controls.

The presentation situates ASW technology within contemporary Safety and Health Management Systems, catastrophic hazard management frameworks and the evolving expectations of regulators for safer by design mining equipment. It demonstrates how design innovation can materially improve health, safety and wellbeing outcomes while supporting organisational capability, system assurance and the future of safer mining on a global stage.