- Author
- Byron Raal, CAS Founder-Editor About the author
- Checked against
- ISO 8573-1AS/NZS 1200AS/NZS 3788AS 4343
- Date last checked
- 12 July 2026
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Mining sector compressed-air profile
Mining air costs real money because it sits in harsh, remote, high-duty service. Mining is one of the largest single industrial users of compressed air in Australia, dominated by Western Australia (iron ore, gold, lithium, nickel), Queensland (coal, copper, bauxite), New South Wales (coal, mineral sands, gold), South Australia (copper, uranium, mineral sands), and Tasmania (zinc, lead, tin). Underground operations are particularly compressed-air intensive: pneumatic drilling, ventilation augmentation, dust suppression, dewatering, materials handling, instrumentation, and emergency life support.
Surface mining adds: open-pit drilling and blasting, haul-truck pneumatic systems, materials processing (crushing, screening, beneficiation), and concentrate handling. Typical site compressor capacity ranges from 200 kW for smaller mines to multi-megawatt installations at the largest iron-ore and coal operations.
The economic stakes are significant. At Australian large-mining contract supply rates (often AUD 0.10 to 0.18 per kWh range per industry-typical contract supply, materially lower than commercial-and-industrial retail prices published by the AER), a 1 MW compressed-air system at 4,000 to 8,000 hours per year costs AUD 400,000 to AUD 1,400,000 per year in electricity alone. Specific contract rates vary by state, supply contract, and demand profile; site-specific tariff analysis is needed for accurate cost modelling (per US DOE, Compressed Air Sourcebook system-cost guidance). If the tariff doesn’t match the mine’s contract structure, the model isn’t fit for a board paper.
Regulatory framework: state-specific, not Commonwealth
Australian mining safety runs under state-specific regulations, NOT by Commonwealth Work Health and Safety law. Each mining state operates its own mining-specific safety act and regulator. References to “Commonwealth WHS” for mining are incorrect. You don’t fix that with a generic safety paragraph; you fix it by naming the state, regulator, and notification path before the equipment order is written.
State framework:
- Western Australia: Work Health and Safety (Mines) Regulations 2022. Mining safety administration in WA has been subject to machinery-of-government changes; the current regulator is WorkSafe WA, under the Department of Local Government, Industry Regulation and Safety (LGIRS), which administers mining statutory positions and certificates; the department previously called DMIRS was restructured, so verify the current remit at the start of any compliance work. Multi-state operators should verify the current WA regulator at every notification cycle.
- Queensland: Coal Mining Safety and Health Act 1999 + Mining and Quarrying Safety and Health Act 1999, administered by Resources Safety and Health Queensland (RSHQ).
- New South Wales: Work Health and Safety (Mines and Petroleum Sites) Act 2013, administered by NSW Resources Regulator.
- South Australia: Work Health and Safety (Mines) Regulations under SA WHS Act, administered by SafeWork SA Mining Inspectorate.
- Tasmania: Work Health and Safety Act 2012 + WHS Regulations 2022, with mining-specific duties under the Mines Work Health and Safety (Supplementary Requirements) Act 2012 and Regulations 2025.
- Victoria: Occupational Health and Safety Act 2004 + OHS Regulations 2017 Part 5.3 (mines), administered by WorkSafe Victoria.
Each state’s mining safety regulator inspects and enforces compressed-air system safety and worker exposure standards, while pressure-equipment plant registration falls to the applicable WHS or pressure-equipment regulator, which in some states (Queensland, for example, where WorkSafe Queensland registers pressure plant separately from the mining safety regulator RSHQ) is a different body. Compliance posture varies materially by state; multi-state operators must maintain separate compliance frameworks per jurisdiction.
For underground mining specifically, additional regulations apply: explosion-protection requirements where flammable atmospheres are possible (coal mines), spontaneous-combustion management, mine ventilation compressed-air supply for emergency life support, and pneumatic emergency rescue equipment (per NSW Resources Regulator, mine-safety regulator landing page; and WA Government, DEMIRS regulator landing page). Several state and federal schemes part-fund exactly this work: check the current grants and incentives before you commit capital.
Compressed-air applications in mining
The application regime decides the air-quality target, not the compressor model. So a longwall hydraulic-tool supply running off a fixed-speed screw in a methane-zoned underground section runs a different ISO 8573 target than a surface-pit drill rig running off a portable diesel-driven package, and the regulatory framework (state mine-safety act + AS/NZS 60079 hazardous-area classification + AS 1715/1716 where breathing air is involved) sets the class before the compressor pad does (per ISO, ISO 8573-1:2010 catalogue abstract).
- Underground drilling: pneumatic-percussion drills typically 600 to 700 kPa, high duty cycle during stope blast preparation. Hydraulic-percussion increasingly common as alternative; reduces compressed-air demand but requires its own hydraulic infrastructure.
- Ventilation and dust suppression: compressed air drives venturi-style dust suppression systems on coal faces, materials-handling transfer points, ventilation door actuators. Continuous duty.
- Dewatering: pneumatic submersible pumps for low-flow underground dewatering at confined working faces. Lower capital cost than electric, simpler maintenance, no electrical hazard in wet conditions.
- Materials handling: pneumatic conveying for fine concentrate transfer in processing plants; pneumatic actuators on chutes, conveyors, screens.
- Instrumentation: process control air for control valves, flow meters, level instruments. Instrument-air typically Class 2 water, oil-free preferred.
- Emergency life support: pneumatic refuge stations in underground mines provide compressed-air supply during emergency events. The most stringent reliability and air-quality application: redundant compressor supply, auto-isolation valves, breathing-grade air per AS 1715 / AS 1716.
Air quality and breathing-air systems
Mining breathing-air quality has to be measured at the cylinder fill point or at the airline outlet, not at the compressor. The greater than 5 micrometre void clause from ISO 8573-1 Section 5.2 applies regardless of compressor age. So a Class 1.2.1 result at the OEM’s preferred sample point downstream of a fresh filter doesn’t mean a Class 1.2.1 result at the worker’s mask after 800 metres of underground distribution. Test where the worker breathes.
Most mining pneumatic applications operate at ISO 8573-1 Class 4 water (+3 degrees Celsius PDP) and Class 2 oil. Standard refrigerated dryer plus coalescing filtration meets this for drilling, ventilation, dust suppression, and materials handling.
Instrument air: Class 2 water (-40 degrees Celsius PDP) to prevent pneumatic line freezing at altitude, winter nights, or sudden expansion across orifices; oil specification typically Class 2 (less than or equal to 0.1 mg/m3) or Class 3 (less than or equal to 1 mg/m3) depending on the specific OEM pneumatic valve and positioner specifications. Heavy-duty mining positioners, control valves, and pneumatic actuators do not strictly require Class 1 oil purity; achieving Class 1 oil (less than or equal to 0.01 mg/m3) often demands activated carbon towers and 0.01 micrometre coalescing cascades which inflate capex and maintenance burden in remote dust-heavy environments without operational benefit to the heavy actuators. Heatless desiccant dryer plus 0.01 micrometre coalescer is the typical dryer-and-filter train; oil-grade target is set against the OEM valve specification.
Breathing-grade air for refuge stations and respiratory protective equipment: operates against the technical baselines established by AS/NZS 1715:2009 (Selection, use and maintenance of respiratory protective equipment) and AS/NZS 1716:2012 (Respiratory protective devices), with deployment thresholds and testing cadences governed by the site’s specific risk-based Respiratory Protection Program (RPP), ventilation control protocols, and direct interventions by the State Chief Inspector of Mines, rather than being uniformly prescribed across all pneumatic systems by the standard itself. Technical baseline contaminant limits per AS/NZS 1715:2009 Appendix A2: oxygen 19.5 to 22% V/V, CO at or below 11 mg/m3 (10 ppm V/V), CO2 at or below 1400 mg/m3 (800 ppm V/V), oil at or below 1 mg/m3, water at or below 100 mg/m3 for cylinders at or above 12 MPa, no objectionable odour, air temperature 15 to 25 degrees Celsius at facepiece. The standards apply across mining, construction, and any industrial application using compressed-air respirators (per HSE, Respiratory protective equipment overview).
Standards and pressure equipment
Mining compressed-air compliance reduces to three asks: which document binds, which evidence proves it, and who signs it off. So the standards stack below covers both the pressure-equipment side (AS/NZS 1200 + 3788 + 4343 + state WHS regulator notifications) and the application side (AS/NZS 60079 hazardous areas, AS 1715 / 1716 breathing air, state-specific mining safety acts), and competent-engineer engagement carries the duty of care across the lot:
- AS/NZS 1200:2015 (current edition): pressure equipment, general requirements; the parent standard that frames the AS 4343 hazard-level classification scheme applied to receivers, dryers, and pressure-rated assemblies.
- AS/NZS 3788:2024 Amd 1:2025: in-service inspection cadence set by the vessel pressure-volume (pV) product per Table 4.1 (Item 6 for compressed-air receivers), not by AS 4343 hazard level.
- AS/NZS 1715 and AS/NZS 1716: AS/NZS 1715 covers selection, use and maintenance of respiratory protective equipment and breathing-air purity; AS/NZS 1716 specifies the respiratory protective devices themselves.
- AS/NZS 60079 series (electrical equipment for explosive gas atmospheres): for any electrical components in flammable zones, including compressed-air-system controls and instrumentation in coal mines.
The applicable state WHS or pressure-equipment regulator administers pressure equipment registration through its inspection regime, with plant-risk duties sitting behind the equipment register (per SafeWork Australia, Managing risks of plant in the workplace model code). Multi-state operators must maintain separate notification compliance per state. How this compares across sectors is covered in our industry guides.
Need an Independent Mining Compressed-Air Brief?
Tell us about your site, your jurisdiction, your application regime, and your duty profile. We can review your brief and discuss a suitable Australian provider if one is available. We ask for your written permission before an introduction and explain any referral payment arrangement. There is no cost to enquire.
Energy efficiency in mining
Mining sites have particularly high leak rates because compressed-air infrastructure usually extends across large distances (surface to underground, multiple workings, decades-old installations). According to the US DOE Compressed Air Sourcebook, AEMO industrial-energy benchmarking, and Australian mining-energy-audit literature, mining-typical leak rates run between 25 and 40 per cent of compressor output, which is materially higher than the 20 to 30 per cent general industrial baseline.
Highest-ROI levers in mining:
- Underground line repair (high yield, often deferred due to access difficulty; structured shutdown windows enable systematic repair)
- Pressure reduction at the trunk-line level during low-demand shifts
- VSD compressor sequencing for sites with multiple compressor stations
- Replacement of pneumatic-percussion drills with hydraulic-percussion where ground conditions allow
Audit methodology at the compressed air energy audit guide. Mining-specific consideration: audits must coordinate with underground access permits and ventilation control protocols.
Sourcing and supplier considerations
Mining compressed-air equipment must withstand harsh operating conditions: dust ingress, vibration, temperature swings, corrosive atmospheres in some applications. Supplier selection criteria: equipment ruggedness ratings, parts availability for remote site delivery, Australian after-sales support presence, and compliance with relevant state mining regulator equipment requirements.
Major supplier categories: original-equipment manufacturer (OEM) compressors, modular dryer and filtration, instrumentation and controls, leak survey and repair services. Independent providers compete with OEM-aligned suppliers; the trade-off is between OEM service-network depth and independent supplier brand-neutrality.
Sourcing matrix for mining operators:
- General site air (drilling, ventilation, dust suppression, materials handling): OEM or independent installer; selection driven by reliability, parts availability, and ruggedness rating for the operating environment.
- Instrument air (Class 2 water, Class 2 or Class 3 oil, Class 1 oil only where an OEM specifies): dedicated dryer-and-filter train downstream of main supply; independent design and validation recommended.
- Breathing-grade air for refuge stations and respiratory protective equipment: AS/NZS 1715 + AS/NZS 1716 specialty installer. Independent designer + competent installer + independent commissioning testing is the AS 1715 expectation. Underground refuge supply requires redundancy with auto-isolation valves; safety-critical reliability bar.
- Pressure vessel registration: notification to the applicable state WHS or pressure-equipment regulator (which may differ from the mining safety regulator) per the jurisdiction; AS/NZS 3788:2024 Amd 1:2025 in-service inspection cycles. Verify state-specific notification window and inspector competency requirements. See the pressure vessel registration guide for state-by-state notification paths.
Discuss your mining compressed-air requirements before committing to equipment or a service. Email byron@compressedairsolutions.com.au with your site postcode, application regime, jurisdiction, duty profile and what you need to establish for your next decision. We can review your brief and discuss a suitable Australian provider if one is available. We ask for your written permission before an introduction and explain any referral payment arrangement. There is no cost to enquire.
If you haven’t yet specified your application regime or sizing approach, start with the air compressor sizing guide. If you’re evaluating compressor types and total cost of ownership before issuing a brief, use the compressor buying guide.
Auditing compressed air at a WA resources site? See the Compressed Air Audit Australia guide for ISO 11011 methodology, costs, and the state funding landscape.
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Frequently asked questions
Which Australian safety regulator covers compressed-air systems on my mine site?
It depends on the state. There is no Commonwealth mining safety regulator. WA mining safety sits under the Work Health and Safety (Mines) Regulations 2022 (verify the current WA regulator name at every notification cycle, as the department has been restructured several times). Queensland runs Resources Safety and Health Queensland under the Coal Mining Safety and Health Act 1999 and the Mining and Quarrying Safety and Health Act 1999. New South Wales sits with the NSW Resources Regulator under the Work Health and Safety (Mines and Petroleum Sites) Act 2013. South Australia uses the SafeWork SA Mining Inspectorate. Tasmania, Victoria, and the smaller jurisdictions each run their own framework. Multi-state operators maintain separate compliance frameworks per jurisdiction; don’t assume one state’s posture covers another.
What air quality must mining breathing-air systems meet?
AS/NZS 1715:2009 Appendix A2 sets the technical-baseline limits for compressed breathing air used in respiratory protective equipment and refuge stations: oxygen 19.5 to 22% V/V, CO at or below 11 mg/m3 (10 ppm V/V), CO2 at or below 1400 mg/m3 (800 ppm V/V), oil at or below 1 mg/m3, water at or below 100 mg/m3 for cylinders at or above 12 MPa, no objectionable odour, and air temperature 15 to 25 degrees Celsius at the facepiece. AS/NZS 1716:2012 covers the respiratory device side. Measure at the cylinder fill point or the airline outlet, not at the compressor; ISO 8573-1 Section 5.2 carries the test-point obligation. A Class 1.2.1 reading downstream of a fresh filter at the OEM’s preferred sample point does not prove the worker is breathing Class 1.2.1 air at the mask 800 metres into the workings.
What ISO 8573-1 class do underground mining pneumatic applications need?
Most underground and surface mining pneumatic applications (drilling, ventilation, dust suppression, materials handling) run at ISO 8573-1 Class 4 water (+3 degrees Celsius PDP) and Class 2 oil, with a refrigerated dryer plus coalescing filtration train. Instrument air for process control valves and flow meters tightens to Class 2 water (-40 degrees Celsius PDP) and typically Class 2 or Class 3 oil, with Class 1 oil (at or below 0.01 mg/m3) only where an OEM valve or positioner specifies it, which means a heatless desiccant dryer plus, where Class 1 oil is required, a 0.01 micrometre coalescer. Breathing-grade air for refuge stations follows AS/NZS 1715:2009 Appendix A2 rather than ISO 8573 numerics. The application sets the target; the compressor and treatment train are sized to meet it.
How much compressed air does a typical mine site leak?
Mining-typical leak rates run 25 to 40 per cent of compressor output, materially higher than the 20 to 30 per cent general industrial baseline. The reason is geometry: underground distribution covers long runs, multiple shifts, decades-old infrastructure, and access windows that make repair difficult to schedule. The highest-ROI lever on most sites is structured shutdown-window line repair on the underground network, followed by trunk-line pressure reduction during low-demand shifts, VSD sequencing across multiple compressor stations, and substituting hydraulic-percussion drills where ground conditions allow. Audit per the energy audit guide before sizing decisions; sizing to that unaudited demand builds in the same 25 to 40 per cent of wasted capacity.
What should I look for in a mining compressed-air supplier?
Equipment ruggedness rating for the operating environment (dust, vibration, ambient temperature swing, corrosive atmosphere exposure), parts availability for remote-site delivery, Australian after-sales support presence, and demonstrated compliance with the relevant state mining regulator’s equipment requirements. For breathing-grade refuge supply, an AS/NZS 1715 and AS/NZS 1716 specialty installer is non-negotiable, with independent designer, competent installer, and independent commissioning testing per the AS 1715 expectation. For pressure vessel registration, the supplier must demonstrate familiarity with the state mining regulator’s notification path and AS/NZS 3788:2024 Amd 1:2025 in-service inspection cycles. Independent providers compete with OEM-aligned suppliers; the trade-off is OEM service-network depth versus independent brand-neutrality.
Get Matched with a Mining Compressed-Air Specialist
Describe your mine site, jurisdiction, application regime, and duty profile. We can review your brief and discuss a suitable Australian provider if one is available. We ask for your written permission before an introduction and explain any referral payment arrangement. There is no cost to enquire.