Port of Townsville, Point Source Limits and Dust Extraction for Mineral Concentrates
The Port of Townsville in Queensland, Australia, handles bulk minerals for port customers including Glencore, South32, Northern Stevedoring Services, Aurizon and Townsville Marine Logistics (Port of Townsville, 2025). The port notes that its operations can affect air quality through both point and diffuse sources (Port of Townsville, 2025). A Port Stakeholder Working Group was set up after a December 2014 report on metal contaminated dust in inner Townsville (Port of Townsville, n.d.). Mineral concentrate handlers now work under model air conditions set by the Queensland environment department (DES, 2019).
Approach
Point source release limits. The Model Operating Conditions (Air) for bulk mineral handling at the port took effect on 18 March 2019 (DES, 2019). Releases from point sources must not exceed the limits in a table of release limits, and operators must monitor them at the set frequency. The table values are specific to each operator's environmental authority (DES, 2019).
Negative pressure storage. Bulk mineral concentrates must be handled and stored within a building kept under negative air pressure sufficient to prevent release of concentrate (DES, 2019). Northern Stevedoring Services operates a negative pressure bulk handling facility valued at $15 million (Port of Townsville, n.d.).
Dust extraction and filtration. Ship loading must use documented dust control systems, for example a dust extraction and filtration system. An appropriately qualified person must design, install, test and commission these systems for each product and handling method (DES, 2019). Northern Stevedoring Services installed a closed conveyor system and a dust extraction unit on its hopper (Port of Townsville, n.d.).
Operator upgrades. Glencore made air control upgrades in 2015 and 2016, including conveyor gallery dust covers, a shiploader splash curtain and fast acting doors on all entrances (Port of Townsville, n.d.).
Boundary monitoring. Three boundary stations, at Coast Guard, Lennon Drive and Enviro Park, measure PM10, TSP and metals including lead. Equipment includes a continuous metals analyser, high volume air samplers and dust deposition gauges (Port of Townsville, 2025). Operators must report each year on compliance with the boundary air quality limits (DES, 2019).
Results
The port reports that levels of some contaminants, such as lead, trended upward from early 2013 until late 2015 and have been falling since. Lead levels at Townsville monitoring sites have never exceeded the National Environment Protection (Ambient Air Quality) Measure standards since monitoring began in 2004 (Port of Townsville, n.d.).
Transferability
DMC ports handling mineral concentrates can set point source release limits in operator permits, require enclosed storage under negative pressure, and require qualified design and commissioning of dust extraction and filtration at loading points.
Linking these controls to boundary monitoring and an annual compliance report gives regulators and communities a way to check that the controls work.
The sources do not identify the type of filter installed; the model conditions mention a baghouse only as an example of a point source.
Sources
All information used for this case study was based on publicly available resources.
- DES (Queensland Department of Environment and Science). 2019. Model operating conditions (Air): Port of Townsville ERA 50 (1) Bulk Material Handling, Minerals. ESR/2019/4794, Version 1.01, effective 18 March 2019. (opens in new tab)
- Port of Townsville. 2025. Boundary Air Monitoring Plan. POT-2356 Rev 2, 10 March 2025. (opens in new tab)
- Port of Townsville. n.d. Port of Townsville and Air Quality in Townsville: Frequently Asked Questions (Port Stakeholder Working Group objectives versus achievements). (opens in new tab)
- Port of Townsville. n.d. Air Monitoring. Web page. (opens in new tab)