Noise Monitoring in Mining

Surface blast hole drills and underground production drills generate continuous high-frequency noise from the drill string, bit-rock interaction, and compressor systems. Drill operators in enclosed cabins are protected only if cabin integrity is maintained and door seals are effective. Offsiders working outside cabins during rod changes and bit replacements face unattenuated drill noise typically exceeding 110 dB(A).

Primary jaw crushers, secondary cone crushers, and vibrating screens generate broadband noise from mechanical impact and material flow. Workers on crusher decks, at screen inspection points, and in nearby control rooms accumulate significant noise dose. Low-frequency noise from large crushers penetrates standard hearing protection and requires HPDs with enhanced low-frequency attenuation.

Surface and underground blasting produces impulse noise with peak levels potentially exceeding 140 dB(C) at the exclusion zone boundary. Blast vibration monitoring and exclusion zone management are critical. Workers in blast crew roles face repeated impulse noise exposure during shot firing sequences across multiple blasts per shift.

Haul trucks, excavators, loaders, dozers, and graders generate continuous broadband noise from engines, hydraulics, tracks, and ground engagement. Operator cabin noise depends on cab design, door seal condition, and HVAC operation. Ground crew and spotters working near mobile equipment face elevated noise from multiple simultaneous sources.

Typical Worker Groups

Common similar exposure groups (SEGs) assessed for this sub-category.

Regulatory Context

The WHS Regulation requires PCBUs to ensure noise exposure does not exceed 85 dB(A) LAeq,8h or 140 dB(C) peak. Where these levels are exceeded, the hierarchy of controls must be applied with engineering controls prioritised over administrative controls and HPDs. Audiometric testing is mandatory for workers with significant noise exposure, conducted at baseline, annually, and at exit. State mines inspectorates audit noise management plans as part of principal hazard management reviews. The Managing Noise and Preventing Hearing Loss at Work Code of Practice provides guidance on monitoring methodology and control strategies.