TL;DR: A drone volumetric survey in Mackay measures run-of-mine, product and reject coal stockpiles across the Bowen Basin to 1-3% volume accuracy without anyone climbing a loose, segregated pile near operating reclaimers. ISS flies CASA-certified RTK UAVs over mine pads at Moranbah, Dysart and Blackwater and the Hay Point and Dalrymple Bay terminals, returning audit-ready volumes referenced to MGA2020 within 24-48 hours.
Key takeaways
- A well-controlled drone volumetric survey on a Bowen Basin coal pile delivers 1-3% volume accuracy — tighter than the 3-5% of a GPS walkover — because the UAV captures the entire segregated face uniformly rather than interpolating between walked points.
- ISS mobilises CASA ReOC operations to Mackay and the basin's coal hubs — Moranbah, Dysart, Blackwater, Middlemount and the Hay Point/Dalrymple Bay terminals — flying the DJI Matrice 350 RTK with Zenmuse P1 photogrammetry or Zenmuse L2 LiDAR payloads.
- With a 500,000 m³ ROM coal stockpile worth AUD 15-30 million, a 5% inventory error is a multi-million-dollar misstatement — which is why basin operators commission monthly drone volumetrics for reconciliation and month-end reporting.
- Queensland's Mining and Quarrying Safety and Health Regulation 2017 and the drone volumetric survey workflow combine here: results are delivered in a form a registered mine surveyor can certify against statutory records.
- Cost is driven by stockpile count, photogrammetry versus LiDAR, ground-control density and reporting cadence — typically AUD 2,500-18,000 per survey, with Bowen Basin monitoring contracts 20-40% lower per visit.
Drone volumetric survey in Mackay and the Bowen Basin
A drone volumetric survey in Mackay is the fast, full-coverage measurement of how much coal, overburden or product sits on a Bowen Basin mine pad, captured by a remotely piloted aircraft and computed against a defined base surface. For operators across central Queensland's coal country, the drone volumetric survey has become the standard month-end tool: it measures every stockpile on a pad in a single morning's flying, then returns cubic metres — and, with bulk density applied, saleable tonnes — within a day or two.
The basin is the reason demand is so concentrated. The Bowen Basin holds Australia's largest proven coal reserves, stretching roughly 650 kilometres from Collinsville south to Emerald, with the Isaac Regional Council area alone hosting 31 active coal mines. Mackay, 100 kilometres east with a population over 80,000, is the logistics and services hub feeding that production, and the Port of Mackay's Hay Point and Dalrymple Bay terminals form the world's largest coal export facility. Every tonne in that chain is booked, reconciled and shipped against a measured volume — and that is exactly what a drone volumetric survey produces.
This page covers how ISS delivers survey-grade drone volumetrics specifically for Mackay and Bowen Basin operations: where it applies on coal sites, the kit we fly, the standards the work is held to, and why local mining experience changes the number on the report.
Key point: "Drone volumetric survey mackay" describes a workflow, not a guaranteed accuracy. On a segregated ROM coal pile the volume is only as good as the surveyed toe plane and the independent check points. A drone with an assumed base surface produces a confident, precise, wrong tonnage — and on a 500,000 m³ pile that error is measured in millions of dollars.
Local applications across Bowen Basin coal operations
The basin's mix of giant open cuts, longwall complexes and dense export infrastructure means volumetrics are needed at almost every link in the coal chain. ISS flies all of them.
ROM and product coal stockpiles
The core job. BMA's open cuts — Goonyella Riverside, Peak Downs, Saraji and Blackwater — and the Anglo American and Stanmore operations all hold run-of-mine, product and reject stockpiles that must be reconciled monthly against CHPP throughput and rail despatch. A single flight over a stockpile pad measures raw coal, washed product and rejects in one sortie, giving the finance and technical-services teams a stable, defensible inventory baseline. Persistent gaps between surveyed volume and plant feed point to fragmentation, dilution or ore loss — and the drone volumetric is what makes that comparison trustworthy.
Overburden and waste-dump movement
At Peak Downs and Saraji, monthly overburden movement runs into the millions of cubic metres, and contractor payment is tied directly to it. Drone volumetric change-detection between epochs measures what has actually moved, protecting both operator and earthmoving contractor on the progress claim — typically several million dollars of diesel and plant per month.
Export terminals and ports
At Hay Point and Dalrymple Bay, stockyard inventory on the pads ahead of the shiploaders feeds vessel-loading planning for Capesize ships up to 230 metres. Repeat volumetrics keep terminal stockpile records honest between rail receival and ship despatch.
Tailings, rehabilitation and compliance
Tailings storage facility freeboard, sediment-dam volumes and progressive rehabilitation landform — all legally significant under Queensland tenement conditions — are captured from the air without ground access to unstable surfaces.
| Application | Typical volume | Value / exposure at stake |
|---|---|---|
| ROM coal stockpile (open cut) | 500,000 m³ | AUD 15-30 million |
| Product coal stockpile | 200,000 m³ | AUD 8-18 million |
| Monthly overburden movement | 1,000,000 m³ | AUD 2-5 million in plant and diesel |
| Terminal stockyard inventory | 300,000 m³ | Vessel-loading and despatch planning |
Indicative only — values vary with coal price, bulk density and contract terms.
Method and equipment for coal-site volumetrics
A drone volumetric survey is only as good as the sensor and control behind it, and Bowen Basin coal sites are demanding: dust, dark low-contrast coal, live plant and large pads all push the method. ISS selects the payload to suit the site rather than forcing one tool onto every job. Every flight runs under our CASA Remote Operator's Certificate (ReOC) by a licensed remote pilot (RePL), after a Job Safety Analysis and site induction, and a pad of a dozen stockpiles is typically flown in under two hours.
- DJI Matrice 350 RTK — our industrial workhorse: IP55 sealing for dusty pads, ~55-minute endurance for large open cuts, and onboard RTK that georeferences each capture to a few centimetres. One airframe carries either payload, covering most basin scopes.
- Zenmuse P1 (45 MP photogrammetry) — the cost-effective route to 1-3% accuracy on open, well-lit stockpiles, with a true-colour orthomosaic as a by-product for documenting pad conditions on the day.
- Zenmuse L2 LiDAR — the right choice for dark coal surfaces, dusty pits, rehabilitation areas and light vegetation, because it measures range directly and returns bare-earth points where photogrammetry would smear a low-contrast surface.
- Ground control and processing — control and independent check points are observed with Leica GNSS and total stations, reduced to MGA2020 or site grid, then processed in Pix4Dmapper and Propeller Aero, with volumes finalised in Trimble Business Center or the Australian-developed 12d Model.
The most error-prone part of any coal volume is the toe — the boundary between pile and pad. Where a surveyed toe plane is required, ISS observes the ground beneath and around each pile so the base surface is measured, not assumed; for change-detection work the prior survey or design surface is registered instead.
Key point: RTK reduces but never eliminates the need for ground control on a survey-grade volumetric. We always retain independent check points, because RTK can produce a precise model that is systematically shifted in the vertical — and on a coal inventory that vertical shift is the difference between a clean reconciliation and a month-end query from finance.
Standards and compliance in Queensland
Drone volumetrics in the Bowen Basin sit inside a statutory framework. Queensland's Mining and Quarrying Safety and Health Regulation 2017 requires accurate mine plans, regular survey pickup and certified records for extraction activity, and removing people from climbing loose, high coal stockpiles near operating loaders directly retires a recognised WHS risk.
ISS operations are governed by the Civil Aviation Safety Regulations (CASR) Part 101 and conducted under our CASA ReOC, with all pilots holding a RePL. Survey deliverables are referenced to GDA2020 / MGA2020 and reduced consistent with the ICSM Standards for the Australian Survey Control Network (SP1), so output drops straight into your existing site datum and mine-planning packages — Surpac, Deswik, 12d and similar.
| Parameter | ISS specification | Notes |
|---|---|---|
| Stockpile volume accuracy | 1-3% | With surveyed ground control and clean toe |
| Horizontal positional accuracy | 20-40 mm | Photogrammetry at ~2 cm GSD |
| Vertical positional accuracy | 30-50 mm | Verified against independent check points |
| LiDAR point density | 100-300 pts/m² | Bare earth after classification |
| Datum | GDA2020 / MGA2020 | Or site grid, per your control |
Accuracy is verified, not asserted: check points withheld from the photogrammetric solution are used to report residuals in the deliverable, and bulk density — the largest source of error converting volume to tonnes — is stated explicitly with its source. Where the work feeds statutory mine survey records, results are provided in a form a registered mine surveyor can certify.
Why ISS for drone volumetrics in Mackay
A general drone operator can produce a point cloud; a survey firm produces a defensible coal tonnage. ISS pairs licensed survey discipline with current UAV technology — flights under a CASA ReOC by RePL-qualified pilots, control and check points observed and reduced by surveyors to MGA2020, and volumes QA'd against independent check points before anything is released. That is what separates a survey-grade drone volumetric survey from aerial imagery with a volume tool bolted on.
Local experience matters here. Our surveyors hold Queensland mine certifications and current inductions for major Bowen Basin operations, understand CHPP and pad access constraints, and know that a 48-72 hour shut window leaves no room for a re-fly. We mobilise from Mackay or Brisbane to align with your maintenance shuts and month-end cycle, and integrate the volumetric into broader scopes — laser scanning of CHPP plant and the wider Mackay and Bowen Basin survey programme — so it is one coordinated visit. Queensland faces the most severe surveyor shortage in Australia; specialist capacity that arrives on schedule and certifies on the first pass is the practical value ISS brings to basin operators.
Frequently asked questions
How accurate is a drone volumetric survey on a Bowen Basin coal stockpile?
With surveyed ground control, independent check points and a clean toe, ISS achieves 1-3% volume accuracy — better than the 3-5% of a GPS walkover, because the UAV captures the whole segregated face uniformly. Dark, low-contrast coal can challenge photogrammetry, so where lighting or dust is poor we fly LiDAR to hold that accuracy. The result is reported against withheld check points, not assumed.
Can you fly while the mine or terminal is operating?
Yes. Flights run at a safe stand-off under a site-specific JSA and CASA conditions, usually without halting plant, with exclusion zones and pad access coordinated with your operations team. We do not fly in rain or high wind — both for safety and because wet coal surfaces and gusts degrade the data. A typical stockpile pad is captured in under two hours.
How quickly can ISS mobilise to Mackay and the basin?
We mobilise from Mackay or Brisbane to align with your maintenance shuts and month-end inventory cycle. Standard reporting is 24-48 hours after capture; rapid same-day turnaround is available for time-critical reconciliation or month-end close. For recurring inventory we run monthly monitoring contracts with preferential scheduling across multiple sites.
Will the volumes satisfy our statutory mine survey and reconciliation needs?
Yes. Deliverables are referenced to MGA2020, reduced consistent with ICSM SP1, and provided in your mine-planning format (Surpac, Deswik, 12d, Trimble). Bulk density and base surface are stated explicitly so the figure can be audited, and where the work feeds statutory records it is delivered in a form a registered mine surveyor can certify.
Request a quote
If you need ROM, product or overburden volumes measured quickly, safely and to a number you can defend across the Bowen Basin, ISS delivers survey-grade drone volumetric surveys to Mackay, Moranbah, Dysart, Blackwater and the Hay Point and Dalrymple Bay terminals. Tell us your stockpiles, accuracy and reporting cadence, and we will scope the right payload and return a fixed-price quote. Call 0407 057 015 or request a quote to get started.
Industrial Spatial Solutions — every cubic metre measured, every tonne defensible.
Related reading: drone volumetric survey method, Mackay and Bowen Basin survey services, 3D laser scanning in Mackay.