TL;DR: A volumetric survey in Gladstone measures the material in the region's bulk stockpiles, pits and earthworks — RG Tanna coal at the port, bauxite and alumina at Yarwun and QAL, aggregate at local quarries — and converts it into a defensible volume and tonnage figure. Industrial Spatial Solutions delivers CASA-certified drone photogrammetry, LiDAR and 3D laser scanning to 1-3% volume accuracy, with per-pile reporting tied to MGA2020/AHD and turned around in 24-48 hours.
Key takeaways
- Gladstone's bulk-handling economy runs on measured volume: the RG Tanna Coal Terminal moves over 55 million tonnes of coal a year, and the Yarwun and Queensland Alumina (QAL) refineries feed on bauxite stockpiles measured in millions of tonnes — every reconciliation, inventory position and contractor claim depends on a survey-grade volume.
- A well-controlled drone volumetric survey in Gladstone achieves 1-3% volume accuracy on open stockpiles, against the 3-5% typical of a GPS walkover, because the UAV captures the whole pile surface — including the steep, segregated faces where volume error concentrates — rather than interpolating between walked points.
- ISS flies the DJI Matrice 350 RTK with the Zenmuse P1 photogrammetry payload or the Zenmuse L2 LiDAR sensor, and uses terrestrial laser scanning for covered or shed-stored material, choosing the method by site rather than forcing one tool onto every pile.
- The base surface — a surveyed toe plane, a prior survey, or a design surface — changes the reported volume more than instrument accuracy does, so ISS measures and states it explicitly in every Gladstone deliverable.
- Indicative cost runs from around AUD $2,500 for a handful of piles to $18,000+ for a multi-stockpile port or refinery survey, with monthly monitoring contracts attracting 20-40% lower repeat rates.
Volumetric survey in Gladstone
Gladstone is built on bulk materials moving through Port Curtis — coal, bauxite, alumina, aluminium, cement and clinker — and almost none of it moves without being counted. A volumetric survey in Gladstone answers the operational question behind that flow: how much material is actually in this stockpile, this pit, this bund or this laydown today, and how much has moved since last month. Get the number wrong and the consequences are financial and immediate — a misstated quarterly inventory, a disputed contractor progress claim, or a reconciliation gap that masks ore loss or double-handling.
Unlike a generic topographic survey, a volumetric survey is built specifically to define the boundary of a material body and calculate the enclosed volume against a defined base surface. That focus matters in Gladstone, where the targets are large, the throughput is continuous, and the value at stake per cubic metre is high. This page covers how ISS delivers volumetric measurement to Gladstone operators, where it is used across the region, the methods and equipment involved, the standards the figures meet, and why local industry uses a survey firm rather than a drone operator. For the broader regional picture, see our Gladstone industrial survey hub; for the underlying discipline, see the volumetric surveying and drone volumetric survey guides.
Where volumetric survey is used across the Gladstone region
The Gladstone applications map directly onto the region's bulk-materials assets:
- RG Tanna Coal Terminal and Barney Point (Gladstone Ports Corporation). The RG Tanna terminal handles over 55 million tonnes of coal annually, railed in from the Bowen Basin via the Blackwater and Moura systems. Coal stockpiles on the pads are surveyed for inventory reconciliation against rail receipts and ship loadings, and to keep booked tonnage honest at month-end. Drone photogrammetry captures an entire pad of piles in a single morning's flying, without anyone climbing loose, segregated coal near active stacker-reclaimers.
- Yarwun Refinery and Queensland Alumina Limited (QAL). Both refineries hold large bauxite feed stockpiles and produce alumina for the Boyne Smelters and for export. Volumetric surveys track feedstock inventory, red-mud and residue placement in the bauxite residue storage areas, and bund capacity — measurement that feeds both production planning and environmental compliance reporting.
- Boyne Smelters and supporting laydowns. Carbon and coke stockpiles, raw-material laydowns and spoil from construction and upgrade works are measured for inventory and earthworks reconciliation across the smelter precinct.
- Cement Australia. Limestone, clinker and aggregate stockpiles at the cement works are surveyed for raw-material inventory and production planning, with laser scanning available where material is stored under cover and a drone cannot fly.
- Central Queensland quarries and civil earthworks. Hard-rock and aggregate quarries supplying the region's construction sector, plus bulk earthworks on industrial and infrastructure projects, rely on per-cubic-metre volumetrics for contractor payment and progress claims.
In every case the value is the same: a fast, repeatable, full-coverage measurement that removes people from hazardous piles and replaces estimate with evidence.
Method and equipment
A volumetric survey is only as good as the sensor and the control behind it, so ISS selects the method to suit the material and the site. The workflow follows the same disciplined sequence whatever the payload.
- Scope and plan. We confirm the targets, the required accuracy, the base surface methodology and the deliverable format, then plan the capture around port access, plant operations and any exclusion zones. Photogrammetry missions are flown at 70-80% overlap and a ground sample distance of typically 1.5-3 cm/pixel, matched to the accuracy target.
- Establish control. For survey-grade output we place and observe ground control points and independent check points with a Leica GNSS receiver or total station, tied to site control or MGA2020. As a rule, control must be 2-3 times more accurate than the survey tolerance.
- Capture. The DJI Matrice 350 RTK flies the planned grid autonomously — carrying the 45 MP Zenmuse P1 for open, well-textured stockpiles, or the Zenmuse L2 LiDAR payload where surfaces are dusty, vegetated, dark or low-contrast (rehabilitation areas, residue storage, overcast pits). For material under sheds or with no clear toe, terrestrial 3D laser scanning captures the surface instead.
- Toe and base surface. The boundary between pile and pad is the most error-prone part of any volume. Where a surveyed toe plane is required, we observe the ground beneath and around each pile so the base is measured, not assumed; for change-detection work the prior or design surface is registered as the base.
- Process and report. Imagery is built into a dense point cloud and digital surface model in Pix4Dmapper or Propeller Aero; LiDAR is classified to bare earth. Volumes are computed in Propeller, Trimble Business Center or the Australian-developed 12d Model, checked against independent check points, and issued as a report stating method, base surface, density and accuracy.
Typical accuracy is 1-3% on stockpile volume with surveyed control and a clean toe, and surface positional accuracy in the 20-50 mm range depending on method and ground sample distance. Gladstone's coastal, high-humidity, cyclone-exposed environment affects flying windows and surface conditions, so we plan capture around weather and calibrate accordingly. Field time for a pad of a dozen piles is usually under two hours, with reporting in 24-48 hours; rapid same-day turnaround is available for month-end inventory or time-critical reconciliation.
Standards and compliance
A volume figure is only useful if it can be defended in an audit, a reconciliation, or a contractual dispute, so ISS works to recognised survey and aviation standards:
- CASA-regulated flight. All UAV operations are conducted under our CASA Remote Operator's Certificate (ReOC) in accordance with CASR Part 101, by pilots holding a Remote Pilot Licence (RePL), with a Job Safety Analysis and site induction completed before any flight near the port, plant or stockpiles.
- Survey datum and control. Deliverables are referenced to GDA2020 / MGA2020 and AHD, or your plant grid, and reduced consistent with the ICSM Standards for the Australian Survey Control Network (SP1), so the data drops straight into your mine-planning, CAD and GIS systems without reprocessing.
- Verified, not asserted, accuracy. Independent check points withheld from the photogrammetric solution are used to report residuals in the deliverable, and bulk density — the single largest source of error in any volume-to-tonnes conversion — is stated explicitly with its source.
- Statutory and environmental reporting. Where volumes feed statutory mine survey records or environmental compliance (residue storage capacity, rehabilitation earthworks), results are provided in a form a registered mine surveyor can certify.
Because the work removes people from climbing loose, high stockpiles and working near operating loaders and conveyors, a drone volumetric also retires a recognised risk under Queensland's WHS mining and resources framework.
Why ISS for volumetric survey in Gladstone
The difference in this market is the gap between a drone operator who can produce a point cloud and a survey firm that produces a defensible volume. Gladstone's coal terminal, refineries and quarries do not need aerial imagery with a volume tool bolted on — they need a number that withstands a financial audit and a contractual challenge.
- Survey discipline, not just flying. ISS observes and reduces its own ground control, retains independent check points, references everything to MGA2020/AHD, and reports accuracy and bulk density transparently — so the figure stands up to reconciliation and audit.
- Method chosen on merit. We are independent and multi-platform: photogrammetry, LiDAR or terrestrial laser scanning, picked for the material and the site, processed in the package best suited to the job, and handed back in your format and datum (12d, Trimble, AutoCAD, Surpac and similar).
- Industrial fluency. Our teams work across coal terminals, alumina refineries, smelters and quarries, understand port and plant access and safety regimes, and integrate volumetrics into wider shutdown, civil and mine-survey scopes rather than treating them as a standalone visit.
- Current certifications. Field staff hold construction inductions, working-at-heights and confined-space tickets, site-specific inductions for major Gladstone facilities, and port security clearances where required.
Frequently asked questions
How accurate is a drone volumetric survey on a Gladstone coal or bauxite stockpile?
With surveyed ground control, independent check points and a clean toe, ISS achieves 1-3% volume accuracy on typical open stockpiles — better than the 3-5% of a GPS walkover, because the UAV captures the entire surface uniformly instead of interpolating between walked points. The accuracy is reported against withheld check points, not assumed, and bulk density is stated explicitly so the tonnage conversion is auditable.
Can you survey stockpiles while the port or refinery is operating?
Yes. Flying is conducted at a safe stand-off under a site-specific JSA and CASA conditions, with exclusion zones and pad access coordinated with your operations team — usually without halting stacker-reclaimers or loaders. We do not fly in rain or high wind, both for safety and because wet surfaces and gusts degrade the data, which matters in Gladstone's coastal, cyclone-exposed conditions.
How do you measure material stored under sheds or with no clear toe?
Covered stockpiles — limestone or clinker under cover at the cement works, for example — are captured with terrestrial 3D laser scanning from multiple positions rather than a drone. Feathered or spread piles with no defined toe need a surveyed base plane so the footprint is measured, not guessed. We identify both in the site assessment and scope the right method before mobilising.
How quickly can ISS deliver volumetric results in Gladstone?
A pad of a dozen stockpiles is typically flown in under two hours, with processing, QA and reporting completed in 24-48 hours for a standard scope. For month-end inventory or time-critical reconciliation we offer rapid same-day turnaround, and for operators running monthly volumetrics we provide repeat-contract rates 20-40% lower than one-off pricing.
Request a quote
If you need stockpiles, pits or earthworks in Gladstone measured quickly, safely and to a number you can defend — coal at RG Tanna, bauxite or residue at Yarwun and QAL, aggregate at a Central Queensland quarry, or earthworks on an industrial project — talk to a surveyor who knows the region's industry.
Call ISS on 0407 057 015 to scope your project, or request a detailed proposal covering methodology, on-site schedule, safety plan and fixed-price quotation. For ongoing volumetrics across multiple Gladstone facilities, we offer service agreements with priority scheduling and dedicated team allocation. See the full Gladstone industrial survey services overview, or the complete volumetric surveying and drone volumetric survey guides to learn more.