TL;DR: A volumetric survey in Kalgoorlie measures Goldfields ore stockpiles, ROM pads, waste dumps, tailings storage facilities and open pits to 1-3% accuracy — fast enough to fly a whole site's stockpiles in a single morning. ISS delivers CASA-certified UAV and 3D laser volumetrics to Super Pit, Mungari and satellite operations across the Eastern Goldfields, reduced to MGA2020 or your mine grid and reported to a number you can defend at audit.
Key takeaways
- A well-controlled volumetric survey in Kalgoorlie achieves 1-3% volume accuracy on gold ore stockpiles and ROM pads — tighter than a 3-5% GPS walkover — because the UAV captures the entire pile surface instead of interpolating between walked points.
- The Goldfields' high-value gold concentrate and ore make volume errors expensive: a 3% error on a 50,000-tonne ROM pad of 2 g/t ore is roughly 3,000 ounces of contained gold, easily AUD 8-12 million of metal at current prices.
- ISS flies RTK/PPK UAVs (DJI Matrice 350 RTK with the Zenmuse P1 and L2 payloads) and processes in Pix4D, Propeller and Trimble Business Center against surveyed ground control, with results in Surpac, Vulcan, Deswik or 12d.
- Active Goldfields operators typically commission monthly volumetrics for inventory reconciliation, contractor overburden payment, and TSF freeboard and capacity monitoring under WA mining and dam-safety obligations.
- Cost is driven by site area, stockpile count, photogrammetry versus LiDAR, ground-control density and reporting cadence — typically AUD 2,500-18,000 per survey, lower on repeat-contract rates, with FIFO mobilisation from Perth or Kalgoorlie-based coordination.
Volumetric surveying in the Goldfields
Kalgoorlie-Boulder sits 595 kilometres east of Perth at the centre of Australia's most productive gold region. The city of roughly 30,000 exists because of gold, and the operations surrounding it — from the Super Pit on the city's doorstep to satellite pits and underground mines extending to Kambalda, Coolgardie and Leonora — move enormous quantities of rock every day. Every tonne of that material is, at some point, sitting in a stockpile, a waste dump, a ROM pad or a tailings cell that someone needs measured.
That is what a volumetric survey in Kalgoorlie does: it measures how much material is in a pile or how much has been moved from an excavation, by capturing the three-dimensional surface and computing the volume enclosed between that surface and a defined base. In a gold operation the answer is rarely just cubic metres — it is contained ounces, booked inventory, a contractor's progress claim, or a regulator's freeboard requirement. The stakes are higher here than on a civil site because the material is worth more per tonne, and because the ore feeding a CIP or heap-leach circuit is reconciled against recovered metal at the end of the month.
The Goldfields environment also shapes the method. Sites are remote, hot and dusty; ROM pads are live with loaders and haul trucks; and stockpiles segregate badly as coarse rock rolls to the toe. Walking a 40-metre run-of-mine pile with a GPS rover is slow, exposes a person to plant interaction, and misses exactly the steep loose faces where volume error concentrates. A drone captures every face uniformly in minutes with nobody on the pile — both a safety gain and an accuracy gain on an operating gold mine.
Key point: In a gold operation the volumetric number is reconciled against recovered metal, not just trucked tonnes. A 2-3% surveyed volume that holds month to month is what lets a mine separate a genuine grade or recovery problem from a measurement artefact.
What gets measured around Kalgoorlie
The Eastern Goldfields generates volumetric demand at almost every stage of the gold value chain. ISS measures these targets routinely across the region.
| Target | Where it occurs in the Goldfields | Why it is measured |
|---|---|---|
| ROM and ore stockpiles | Fimiston ROM pads, Mungari mill feed, satellite pit ROM | Mill-feed inventory, grade-blend control, month-end reconciliation |
| Low-grade and oxide stockpiles | Long-term pads at most Northern Star and Evolution sites | Deferred-ore inventory valuation for financial reporting |
| Waste and overburden dumps | Super Pit dumps, open-cut satellite dumps | Contractor payment per cubic metre, landform and stability conformance |
| Tailings storage facilities | TSFs at Fimiston, Mungari and regional plants | Freeboard, remaining capacity and raise volume monitoring |
| Open-pit progress | Active benches between formal mine surveys | Short-interval ore/waste delineation and reconciliation |
| Heap-leach pads | Heap and SX-EW style operations across the region | Placed-tonne tracking and lift conformance |
The marquee operation is Kalgoorlie Consolidated Gold Mines (KCGM) — the Super Pit, managed by Northern Star Resources (50%). At roughly 3.5 km long, 1.5 km wide and over 600 m deep, with more than 21 million ounces produced since 1989, it generates continuous demand for pit-progress volumes, waste-dump movement and ROM inventory feeding the Fimiston mill and Gidji roaster. Twenty kilometres west, Evolution Mining's Mungari complex blends ore from multiple pits and underground sources through a central plant — making accurate stockpile and ROM volumes essential for ore tracking and blend control. Beyond these, Ramelius Resources, Westgold Resources, Silver Lake Resources and Red 5 (King of the Hills) run open-cut and underground operations across the region, each with its own stockpiles, dumps and TSFs to measure.
For the full picture of mining around the region, see our Kalgoorlie and Goldfields mining survey hub. For the underlying method and standards, see our volumetric surveying and drone volumetric survey service pages.
Method and equipment for Goldfields volumetrics
A volumetric survey is only as good as the sensor and the control behind it. ISS selects the payload to suit the target rather than forcing one tool onto every pile, and every flight runs under our CASA Remote Operator's Certificate (ReOC) by a licensed remote pilot (RePL), preceded by a Job Safety Analysis and site induction.
UAV photogrammetry — the Goldfields default
For open, well-textured gold ore and waste in the strong Goldfields light, photogrammetry is the most cost-effective route to 1-3% volume accuracy. We fly the DJI Matrice 350 RTK with the Zenmuse P1 (45 MP full-frame) at 70-80% overlap and a ground sample distance of 1.5-3 cm/pixel, producing a true-colour orthomosaic of the site on the day as a by-product. A pad of a dozen stockpiles is captured in under two hours.
Aerial LiDAR — for dust, dark rock and rehabilitation
Where surfaces defeat photogrammetry — heavily dusted haul-road dumps, dark sulphide waste, scrubby rehabilitation areas or overcast pits — we fly the Zenmuse L2 LiDAR payload. It measures range directly and penetrates light vegetation to return bare-earth points at 100-300 pts/m², giving reliable volumes where image-based methods smear the surface.
Terrestrial laser scanning — covered and confined material
Drones cannot measure stockpiles under cover or with no clear toe. For ore in covered storage, around mill infrastructure, or where the highest accuracy (1-2%) is required, ISS uses 3D laser scanning from multiple set-ups. This is also the method for complex bin and bunker geometry inside a processing plant.
Ground control and the toe
The most error-prone part of any volume is the boundary between pile and pad. Ground control points and independent check points are observed with Leica GNSS and total stations, reduced to MGA2020 or site grid, with control held 2-3 times more accurate than the survey tolerance. Where a surveyed toe plane is needed we measure the ground beneath and around each pile; for change detection we register the prior or design surface as the base instead.
Key point: RTK and PPK reduce — but never eliminate — 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. A check point is the only thing that catches that before the volume is reported and a month's reconciliation is built on it.
Accuracy, standards and reconciliation
A well-executed volumetric survey in Kalgoorlie achieves 1-3% volume accuracy on typical stockpiles, with positional accuracy on the surface model of 20-50 mm depending on GSD, control and method. The headline volume percentage is what most operators care about; the positional accuracy and the check-point residuals are what make it defensible at audit.
| Parameter | ISS specification | Notes |
|---|---|---|
| Stockpile volume accuracy | 1-3% | 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 withheld check points |
| LiDAR point density | 100-300 pts/m² | Bare earth after classification |
| Laser scan volume accuracy | 1-2% | Covered or complex stockpiles |
ISS operations comply with the Civil Aviation Safety Regulations (CASR) Part 101 and are conducted under our CASA ReOC; all pilots hold 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 mine grid. Where the work feeds statutory mine survey records under the WA Mines Safety and Inspection Act and the Work Health and Safety (Mines) Regulations 2022, results are provided in a form a registered mine surveyor can certify. Tailings volumetrics are reported to support the dam-safety and freeboard obligations operators hold under their licences and ANCOLD-aligned management plans.
Accuracy is verified, not asserted. 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-to-ounces conversion — is stated explicitly with its source. On a gold site that transparency matters: the volume figure flows into the grade-control model, the inventory position and the monthly reconciliation, and every one of those is scrutinised.
Why ISS for volumetric surveys in Kalgoorlie
ISS pairs licensed survey discipline with current UAV and scanning technology, and we work the Goldfields the way the Goldfields actually run. We coordinate projects through Kalgoorlie to minimise mobilisation time for sites within the region, and FIFO from Perth on commercial flights or charter for larger scopes. Our surveyors have worked the full range of Goldfields operations — Super Pit benches, central-mill ROM pads, satellite dumps and remote TSFs.
We are independent and multi-platform: we fly photogrammetry or LiDAR on its merits, scan where drones cannot, process in the package best suited to the job, and hand back data in your format and datum — Surpac, Vulcan, Deswik, 12d, AutoCAD or your preferred mine-planning software. Our instruments are selected and maintained for performance in Goldfields heat, dust and vibration, and we carry backup equipment to site so a survey is not lost to a single hardware fault on a remote pad. A drone operator can produce a point cloud; ISS produces a defensible volume — observed control, withheld check points, MGA2020, and transparent density reporting — so the number withstands audit, reconciliation and contractual scrutiny.
Frequently asked questions
How accurate is a volumetric survey on a Kalgoorlie gold stockpile?
With surveyed ground control, withheld check points and a clean toe, ISS achieves 1-3% volume accuracy on typical ROM and product stockpiles, and 1-2% with terrestrial laser scanning on covered or complex piles. That is tighter than the 3-5% of a GPS walkover, because the UAV captures the whole surface uniformly rather than interpolating between walked points. The accuracy is reported against independent check points, not assumed — which is what lets the figure carry into your grade-control model and month-end reconciliation.
How quickly can ISS mobilise to a Goldfields site and deliver results?
We coordinate through Kalgoorlie for sites in the region and FIFO from Perth for larger scopes; typical mobilisation is within days depending on inductions and equipment. A pad of a dozen stockpiles is flown in under two hours, with processed volumes, DSM, orthomosaic and per-pile report delivered in 24-48 hours. Same-day turnaround is available for time-critical month-end inventory or reconciliation.
Can you survey while the mine is operating?
Yes. Flying is conducted at a safe stand-off under a site-specific JSA and CASA conditions, usually without halting plant or haulage. We coordinate exclusion zones and pad access with your operations team. We do not fly in rain or high wind — both for safety and because wet ore surfaces and gusts degrade the data and the bulk density assumption.
Do you handle tailings storage facility and waste-dump volumes as well as ore stockpiles?
Yes. TSF freeboard, remaining capacity and raise volumes are a routine Goldfields scope, reported to support your dam-safety and licence obligations. Waste and overburden dump movement is measured per cubic metre for contractor payment and landform conformance. We can capture ore stockpiles, dumps and a TSF in a single coordinated mobilisation rather than separate visits.
Request a quote
If you operate in the Kalgoorlie Goldfields and need stockpiles, ROM pads, dumps, tailings or pits measured quickly, safely and to a number you can defend at reconciliation and audit, ISS delivers survey-grade volumetric surveys across the Eastern Goldfields. Tell us your targets, accuracy and reporting cadence, and we will scope the right method 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 ounce defensible.
Related reading: Kalgoorlie and Goldfields mining survey services, volumetric surveying methods, drone volumetric surveys.