TL;DR: A volumetric survey in Moranbah measures the coal, overburden and reject volumes that drive month-end reconciliation across the Bowen Basin's largest mines — BMA's Goonyella Riverside, Peak Downs, Saraji and Caval Ridge, and Anglo American's Moranbah North and Grosvenor. Industrial Spatial Solutions delivers drone and laser-scan volumetrics tied to MGA2020 control, typically accurate to 1-2% by volume, for ROM and product stockpile inventory, pit and dump progression, and rehabilitation earthworks. Call ISS on 0407 057 015 for a scoped volumetric survey in Moranbah.
Key takeaways
- A volumetric survey in Moranbah is most often a coal inventory or earthworks measurement — ROM, product and reject stockpiles at the CHPP, plus pit-and-dump progression across BMA and Anglo American leases that ring the town.
- Coal volume is money: a 5% error on a 500,000 m³ ROM stockpile worth $15-30 million is millions of dollars of misstated inventory at quarter-end, so survey method and stated accuracy matter as much as the number itself.
- ISS flies RTK/PPK drone photogrammetry for open-cut volumes (1-2% by volume) and uses terrestrial laser scanning for covered or confined stockpiles, all anchored to a tied control network rather than standalone imagery.
- Volumetrics feed grade and mass reconciliation against CHPP throughput and railings to Hay Point and Dalrymple Bay, so volume-to-tonnes conversion requires a stated bulk density — coal density varies with seam, moisture and compaction.
- Indicative cost for a Moranbah mine stockpile survey runs roughly $4,000-$18,000 depending on pile count and site size, with monthly monitoring contracts attracting lower per-survey rates.
Table of contents
- Volumetric surveying in the Moranbah district
- Local applications and sites
- Method and equipment for Bowen Basin volumes
- Standards and compliance
- Why operators choose ISS for volumetrics in Moranbah
- Frequently asked questions
- Request a quote
Volumetric surveying in the Moranbah district
Moranbah exists because of coal, and coal is sold, reconciled and reported by volume and mass. Built in 1971 to house the Goonyella workforce and sitting roughly 150 kilometres south-west of Mackay on the Peak Downs Highway, the town is the closest residential centre to one of the densest clusters of metallurgical coal mines on earth. The surrounding Isaac Regional Council area hosts 31 active mines, and every one of them runs on volume figures — how much raw coal is on the ROM pad, how much product is awaiting railing, how much overburden a contractor moved this month, and how much void remains before a dump reaches final landform.
That makes the volumetric survey one of the most frequently requested disciplines around Moranbah. It is the measurement that underpins financial inventory, production reconciliation, contractor payment and environmental compliance. A volumetric survey captures the three-dimensional surface of a stockpile, pit or earthwork and calculates the volume between that surface and a defined base — a surveyed base plane beneath the pile, a previous survey surface for change detection, or a design surface for cut-and-fill remaining.
The financial stakes are unusually high in the Bowen Basin because the volumes are enormous. A single ROM coal stockpile of 500,000 m³ can be worth $15-30 million; monthly overburden movement at a major open-cut runs to a million cubic metres or more in diesel and equipment cost. An error of a few per cent on numbers of that magnitude flows straight into quarterly inventory valuation, reconciliation against plant throughput, and contractor progress claims. The accuracy of the volume, and the clarity of the methodology behind it, are not academic — they are audited.
Key point: Around Moranbah, a "volumetric survey" almost always means coal and earthworks volumes feeding month-end reconciliation. The number has to be defensible: tied to control, with a stated base surface, a stated accuracy, and — where converted to tonnes — a stated bulk density.
Local applications and sites
The volumetric work around Moranbah falls into two broad camps that mirror the mining itself: BMA's predominantly open-cut and hybrid operations spread through the district, and Anglo American's underground longwall mines to the north, where the surface volumetric demand is concentrated on stockpiles, dumps and rehabilitation rather than the pit.
BMA open-cut volumes
BMA's Bowen Basin complex around Moranbah includes Goonyella Riverside, Peak Downs, Saraji, Broadmeadow and Caval Ridge — several of the largest metallurgical coal mines on the planet, collectively moving tens of millions of tonnes a year. These open-cut and hybrid operations generate relentless volumetric demand:
| Asset / activity | Typical volume | Volumetric survey purpose |
|---|---|---|
| ROM coal stockpile | 100,000-500,000 m³ | Month-end inventory, reconciliation vs CHPP feed |
| Product coal stockpile | 50,000-300,000 m³ | Finished-goods inventory, railing planning |
| Reject / tailings co-disposal | Variable | Capacity tracking, environmental compliance |
| Overburden / dump progression | ~1,000,000 m³/month | Contractor payment, mine plan reconciliation |
| Final void and landform | Whole-of-pit | Rehabilitation conformance to approved landform |
For draglining open-cut mines such as Peak Downs and Saraji, volumetric surveys also support pre-strip measurement, dump management and reconciliation of mined-versus-planned material — the check that flags poor blast fragmentation, ore loss or measurement drift before it compounds.
Anglo American surface volumes
Anglo American's Moranbah North and Grosvenor longwall mines extract underground, but they still stockpile, dump and rehabilitate at surface. Volumetric surveys here cover ROM and product stockpile inventory at the surface CHPP, reject emplacement and water/sediment dam capacity, and rehabilitation earthworks as disturbed areas are returned to landform. With Grosvenor back in longwall production after its 2024 rebuild, conformance and as-built volumes on reinstated surface infrastructure carry added scrutiny.
Coal from the district is railed via the Aurizon-operated Goonyella rail system to the Hay Point and Dalrymple Bay terminals south of Mackay — the world's largest metallurgical coal export complex. Because shipped tonnes are ultimately measured at the weighbridge and port, mine-gate volumetrics have to reconcile cleanly with downstream mass, which is why a stated, validated bulk density sits at the centre of every coal volume report.
Method and equipment for Bowen Basin volumes
ISS selects the volumetric method to suit the asset and the conditions rather than forcing one technique onto every pile. The Bowen Basin is hard on both equipment and data: summer heat regularly exceeds 40°C, fine coal and overburden dust degrades imagery, dark coal surfaces create heat shimmer over the pile, and wet-season access constrains both ground crews and flight windows.
UAV drone photogrammetry is the primary method for open-cut volumes. A single flight over a mine's ROM, product and reject pads captures the entire pile surface — including faces a surveyor cannot safely walk — and processes into a dense point cloud and digital surface model. With a properly placed and surveyed ground control network, ISS achieves 1-2% by volume on Moranbah stockpiles, and a whole-site stockpile run can be flown in a couple of hours without stopping production. RTK/PPK-enabled aircraft reduce the ground control burden over hazardous terrain.
Terrestrial laser scanning is used where drones cannot fly or where the highest accuracy is required: coal under cover, stockpiles in confined plant areas, or complex multi-lobed geometry. Scanners capture millions of points per setup, delivering point clouds for volume calculation to 1-2% with full surface fidelity.
GPS and total station methods remain valid for small, accessible piles or where flight restrictions apply, typically landing at 3-5% by volume. Whatever the capture method, the volume is only as good as the base surface and the control behind it.
Processing runs in the platform best suited to the job — Pix4D, Propeller Aero, Trimble Business Center, or 12d Model for civil integration — and all deliverables are tied to MGA2020 and AHD so they drop straight into mine planning systems such as Surpac and Deswik without reprocessing.
| Do | Don't |
|---|---|
| Establish a tied control network beneath and around the pad before flying, so the volume reaches engineering accuracy | Treat standalone drone imagery with no ground control as a survey-grade volume |
| State the base surface explicitly — base plane, previous surface or design surface — because each yields a different number | Compare this month's volume to last month's using an inconsistent or undocumented base |
| Capture coal density samples and state the bulk density used for any volume-to-tonnes conversion | Quote tonnes off a generic density and let it flow unchecked into reconciliation |
| Fly in stable morning conditions around dust events, blasting windows and exclusion zones | Fly in afternoon heat shimmer over dark coal, or without current CASA authority and a flight notification |
Standards and compliance
Volumetric work around Moranbah is governed by Queensland's resources safety and survey framework, and by the aviation rules that cover drone capture. ISS produces volume deliverables to be accepted by operators and the regulator without reprocessing.
- Coal Mining Safety and Health Act 1999 and Regulation 2017 — establish the safety and health framework for coal mines, including obligations around accurate plans and monitoring; volumetric survey supports dump, void and storage management within this framework.
- Surveyors Act 2003 (Qld) and Surveyors Regulation — govern who may carry out survey work in Queensland and the standards that apply.
- Geocentric Datum of Australia 2020 (GDA2020/MGA2020) and AHD — the spatial datums ISS ties every volumetric deliverable to, ensuring compatibility with statutory plans and mine planning software.
- CASA Part 101 and Remote Operator Certificate (ReOC) — all drone volumetric flights are conducted under current CASA authority by licensed remote pilots, with site approvals and flight notifications in place.
- Reporting practice — each report states the calculation methodology, base surface, estimated accuracy and the bulk density applied for tonnage, in line with sound inventory and reconciliation practice.
Key point: A coal volumetric report is only useful if it is auditable. ISS states method, base surface, accuracy and density on every report, so your inventory, reconciliation and contractor-payment teams can defend the figure to auditors and the regulator alike.
Why operators choose ISS for volumetrics in Moranbah
Industrial Spatial Solutions services Moranbah through FIFO and drive-in mobilisation coordinated from Mackay and Brisbane, built around the operational rhythm of Bowen Basin coal:
- Reconciliation-ready deliverables — volumes tied to MGA2020/AHD with stated base surface, accuracy and density, issued in DWG, DXF, LandXML, 12d Model, Surpac or Deswik formats your planning and finance teams already use.
- Month-end discipline — stockpile surveys scheduled to land on your reporting cycle, so inventory and reconciliation numbers arrive on time, every period.
- Coal-certified field staff — crews hold current Queensland coal mine inductions and work under each site's safety and health management system, including the major Moranbah operations.
- One contractor, every method — drone, laser scan, GPS and total station under one roof, so the right tool is applied to each pile rather than the only tool available.
Queensland faces the most acute surveyor shortage in the country, with the state's resources pipeline and infrastructure programme through to the 2032 Brisbane Olympics all competing for the same shrinking pool. For Moranbah operators that means generalist firms carry longer lead times and higher reconciliation risk. ISS provides specialist volumetric capacity built specifically for coal. For the full picture of our surveying across the district, see our Moranbah surveying services.
Frequently asked questions
How accurate is a drone volumetric survey at a Moranbah coal mine?
With a properly placed and surveyed ground control network, ISS drone volumetrics typically achieve 1-2% by volume on Moranbah stockpiles and earthworks. Terrestrial laser scanning achieves similar accuracy with full surface fidelity for covered or confined piles, while GPS and total station walkovers land at around 3-5%. Accuracy depends on ground control, surface model resolution, edge definition and the defined base surface — all of which are stated in the report.
Can you convert our coal stockpile volume to tonnes?
Yes, but the conversion is only as good as the bulk density used. Coal density varies with seam, moisture content, segregation and compaction, so ISS states the bulk density applied to any volume-to-tonnes figure and its source. For reconciliation against CHPP throughput and railings to Hay Point and Dalrymple Bay, we recommend density sampling rather than a generic assumption, so mine-gate volumes reconcile cleanly with downstream mass.
How quickly can ISS mobilise a volumetric survey to Moranbah?
ISS mobilises to Moranbah on a FIFO and drive-in basis from Mackay and Brisbane, scheduled around your month-end reporting cycle, shut or project milestone. For recurring monthly stockpile surveys we lock in a fixed window each period; for one-off or urgent volumes we move as fast as site induction and access approvals allow. Where inductions are already current, mobilisation is substantially faster.
What does a volumetric survey in Moranbah cost?
Cost depends on pile count, site size, accuracy requirement and reporting complexity. As a guide, a mine stockpile survey of 5-20 piles runs roughly $4,000-$10,000, scaling to $8,000-$18,000 for large sites of 20-50 piles; high-accuracy laser scanning of a confined area starts higher. Monthly monitoring contracts attract lower per-survey rates because control and workflows are already established. Call 0407 057 015 for a scoped, fixed-price quotation.
Request a quote
If you need a defensible volume figure around Moranbah — for inventory, reconciliation, contractor payment or rehabilitation conformance — talk to a surveyor who understands Bowen Basin coal.
- Call ISS on 0407 057 015 — describe your stockpiles, pits or earthworks and your reporting cycle.
- Receive a scoped proposal — we set out method, base surface, accuracy, density approach, schedule and deliverable formats specific to your site.
- Mobilise to site — we coordinate inductions, FIFO travel and equipment to land your volumes on your reporting cycle.
For ongoing monthly stockpile programmes across multiple Isaac-region sites, ISS offers service agreements with preferential scheduling and consolidated reporting. Call 0407 057 015 to request a quote.
Industrial Spatial Solutions — Volume measured, inventory accurate, reconciliation ready.
Related reading: Moranbah surveying services, Volumetric surveying guide