TL;DR: Industrial Spatial Solutions delivers volumetric survey across Wollongong and the Illawarra — measuring ROM and product coal stockpiles at South32's Appin and Dendrobium operations, bulk material at Port Kembla's coal and ore terminals, and quarry extraction across the region to 1-3% accuracy. We are based in the Illawarra, so a crew typically mobilises within 24 hours with CASA-certified RTK drones and a Leica RTC360 scanner ready for stockyard and live-plant conditions.
Key takeaways
- A volumetric survey in Wollongong measures stockpile, pit and earthwork volumes by drone photogrammetry or 3D laser scanning, delivering 2-3% accuracy on coal and ore piles and 1-2% on scanned indoor or shed stockpiles — fast enough to fly an entire stockyard in a single sortie without stopping operations.
- Major Illawarra users include South32 Illawarra Metallurgical Coal (Appin and Dendrobium washed-coal stockpiles), BlueScope Port Kembla (coke, sinter feed and raw-material yards), the Port Kembla coal and grain terminals, and regional hard-rock quarries.
- A 5% volume error on a 500,000 m³ metallurgical coal stockpile worth ~$15-30M is roughly $1M of misstated inventory — which is why monthly reconciliation surveys are non-negotiable for financial reporting under listed-company accounting.
- Drone capture is CASA-certified under Part 101 with an RePL operator, and deliverables are tied to ICSM and AS/NZS survey control with a stated base surface and bulk density, so volumes hold up in audit and contractor payment disputes.
- Illawarra volumetric work typically runs AUD $2,500-$18,000 depending on pile count, accuracy and reporting, with discounted rates for monthly monitoring contracts; ISS quotes scoped work, not generic day rates.
Volumetric survey for the Illawarra's bulk materials
Wollongong sits at the centre of one of Australia's densest industrial corridors — Port Kembla Steelworks, the Illawarra coalfield, and a major bulk-cargo port all within a 20-kilometre radius. Every one of those operations moves material by the tonne, and tonnes start as cubic metres. That is the work of a volumetric survey: measuring the three-dimensional surface of a stockpile, pit or earthwork and calculating the enclosed volume against a defined base surface.
In the Illawarra the material is mostly metallurgical (coking) coal — South32's Bulli Seam product feeds BlueScope's domestic steelworks and exports through Port Kembla — alongside coke, sinter feed, iron-ore fines, flux and quarried aggregate. These are dense, segregating, often wet materials stored in large open yards and, increasingly, under cover. Measuring them accurately needs more than a GPS walkover: it needs comprehensive surface capture that records the whole pile, including the inaccessible faces and the toe where most volume error hides.
ISS is a Wollongong-based firm, not a fly-in provider. Our crews know the access routes into the Port Kembla precinct, the induction requirements at South32 and BlueScope sites, and how the escarpment terrain and coastal sea breeze affect drone windows. That local knowledge is why we can capture, process and turn around Illawarra volumetrics faster than crews mobilising from Sydney.
Key point: Volume is money. A misstated coal stockpile flows straight through to inventory valuation, production reconciliation and royalty calculation — so the survey method and stated accuracy matter as much as the number itself.
Where volumetric survey is used across the Illawarra
The region's industrial mix creates steady demand for repeatable, audit-grade volume measurement. The table below maps the major Illawarra operators to the volumetric work they typically require.
| Operation | Operator | Material / activity | Volumetric requirement |
|---|---|---|---|
| Appin Colliery | South32 Illawarra Metallurgical Coal | Underground longwall coking coal | Monthly ROM and product stockpile reconciliation |
| Dendrobium Colliery | South32 Illawarra Metallurgical Coal | Underground longwall coking coal | Washed-coal yard inventory, rehabilitation earthworks |
| Port Kembla Steelworks | BlueScope | Coke, sinter feed, iron-ore fines, flux | Raw-material yard inventory, reclaim reconciliation |
| Port Kembla coal & grain terminals | Port operators / NSW Ports | Export coal, grain, bulk cargo | Stockyard volumetrics, throughput reconciliation |
| Regional hard-rock quarries | Holcim / Boral and others | Aggregate, road base | Pit progress, stockpile inventory, blast volumes |
| M6 Stage 1 / West Dapto earthworks | Civil contractors | Cut, fill, borrow and spoil | Earthworks progress claims, quantity verification |
These operations need volumetrics at several stages: monthly inventory for financial reporting, production reconciliation against plant throughput, contractor payment on earthworks priced per cubic metre, and capacity tracking on waste and rehabilitation earthworks. The density of sites in a small geographic area is exactly why a local crew can offer same-week — often same-day — mobilisation.
Method and equipment
The right method depends on the pile, the access, and the accuracy you need. ISS selects from the full toolkit rather than forcing every job onto one platform.
UAV drone photogrammetry is the workhorse for open stockyards. A DJI Matrice-class RTK drone flies a programmed grid over the yard, capturing heavily overlapping imagery that photogrammetric software (Pix4Dmapper, Propeller Aero) resolves into a dense point cloud and digital surface model. With sound ground control this achieves 2-3% accuracy, and a single sortie can cover an entire Port Kembla or colliery stockyard in well under two hours — no personnel walking live piles under active reclaimers.
3D laser scanning with a Leica RTC360 is the choice where accuracy matters most or the drone cannot fly: covered coal sheds, indoor flux and additive bins, congested reclaim areas, and stockpiles under conveyor structures. Scanning captures millions of points per setup and delivers 1-2% volume accuracy, registered to the same control as the open-yard work so monthly comparisons are consistent.
GPS and total station remain valid for small, accessible piles or where coastal sea breeze closes the drone window — common in Illawarra afternoons. All capture is tied to ICSM datum and AS/NZS survey control, and every report states the base surface (surveyed base plane, prior surface, or design surface) and the bulk density applied for any tonne conversion, with its source.
Key point: The number is only as good as the base surface and the density behind it. ISS states both explicitly, so a volume survives audit, contractor challenge and reconciliation review.
Standards and compliance
Volumetric work in the Illawarra sits inside a real regulatory and accounting framework, and ISS deliverables are built to satisfy it.
- CASA Part 101 governs all UAV operations. ISS flies with a certified Remote Pilot Licence (RePL) holder and operates under a Remote Operator's Certificate (ReOC), with each Port Kembla precinct flight cleared for the controlled airspace and site constraints around the steelworks and port.
- ICSM SP1 and the Surveying and Spatial Information Act 2002 (NSW) set the control and accuracy framework; volumes are referenced to MGA2020/GDA2020 and AHD, so they integrate cleanly with mine plans and engineering design.
- Work Health and Safety (Mines and Petroleum Sites) Regulation 2014 drives the survey cadence and record-keeping behind South32's coal operations, including stockpile and rehabilitation reporting.
- AASB / financial reporting standards mean listed operators must report stockpile inventory accurately — the practical reason monthly volumetric reconciliation is mandatory, not optional, for coal and steel feedstock.
Reports include the methodology, an accuracy statement, pile-by-pile volume and tonne tables, 3D visualisations and cross-sections, GCP locations, and deliverables in the client's format (point clouds, surface models, and 12d/CAD where required).
Why ISS for volumetric survey in Wollongong
Being based in the Illawarra changes the economics and the quality of a volumetric programme. Our crews have flown and scanned the region's stockyards repeatedly, hold current inductions for BlueScope Port Kembla and South32 Appin and Dendrobium, and know which yards are reclaim-active at which shift, where the drone exclusion zones sit, and when the sea breeze typically kills an afternoon flight.
That continuity matters most on repeat work. A monthly reconciliation programme depends on capturing the same pile against the same control month after month — a crew that already knows the site spots a drifting base surface or a mislabelled pile before it corrupts the trend. We do not charge fly-in or FIFO travel premiums for local Illawarra work, and for ongoing programmes we offer annual contracts with preferential scheduling and consolidated reporting.
The result is a defensible, repeatable volume — the kind that holds up in an audit, settles a contractor payment claim, and reconciles cleanly against plant throughput.
Frequently asked questions
How accurate is a volumetric survey in Wollongong, and what does it cost?
For open coal and ore stockyards, our drone surveys deliver 2-3% volume accuracy with good ground control; covered sheds and congested areas scanned with the RTC360 reach 1-2%. Indicative pricing runs from about AUD $2,500 for a small single-yard job to $8,000-$18,000 for a large multi-pile site, with discounted rates on monthly monitoring contracts. We quote scoped work against your specific yard and reporting needs, not a generic day rate.
Can you survey our coal stockpiles without stopping reclaim operations?
Yes. Drone capture is non-contact and flown above the yard, so we measure live stockyards without halting reclaimers or stackers, and without putting personnel on active piles. For covered sheds where a drone cannot fly, the RTC360 scanner captures the pile from safe standoff positions. We coordinate flight and scan windows around your shift pattern and any CASA airspace constraints in the Port Kembla precinct.
How quickly can ISS mobilise in the Illawarra?
For existing clients with inductions in place we can typically attend within 24 hours, and same-day for urgent reconciliation or contractor-claim disputes, subject to weather and the coastal drone window. New clients should allow 2-3 business days for consultation, quote and site induction. Because we are Wollongong-based, there is no fly-in delay or travel premium.
Why does the base surface and bulk density matter on our reports?
A volume only means something relative to a defined base — a surveyed base plane, the previous month's surface, or a design surface — and each produces a different figure, so we state which we used. Converting cubic metres to tonnes needs an accurate bulk density, which varies with coal type, moisture and compaction; we state the density and its source on every report so your inventory, reconciliation and royalty figures are defensible.
Request a quote
If you need volumetric survey across Wollongong and the Illawarra — a one-off stockpile measurement, earthworks quantity verification, or an ongoing monthly reconciliation programme — speak directly with a surveyor who knows the region's stockyards and sites.
Call ISS on 0407 057 015 for a scoped, fixed-price quotation with methodology, accuracy statement and deliverables defined up front. We can usually provide a proposal within 48 hours and, with inductions already in place across the major Illawarra sites, mobilise quickly.
Industrial Spatial Solutions — Wollongong-based, industry-focused, data-driven.
Related reading: Industrial surveying in Wollongong and the Illawarra, Volumetric surveying: measuring stockpiles, pits and earthworks