TL;DR: A volumetric survey in Karratha measures the material sitting in iron ore stockpiles, salt crystalliser ponds, quarry pits and civil earthworks so operators can reconcile production, value inventory and verify contractor payments. ISS delivers drone, GPS and laser-scan volumetrics to 1-3% accuracy across the Pilbara coast — from Rio Tinto's Dampier and Cape Lambert stockyards to Dampier Salt's solar fields — linked to our Karratha and Pilbara survey hub and our volumetric surveying service.
Key takeaways
- A volumetric survey in Karratha typically measures iron ore ROM and product stockpiles, solar salt harvest piles, blue-metal and aggregate quarry stocks, and bulk earthworks for LNG and port construction — each with very different surface and density behaviour.
- Drone photogrammetry and LiDAR achieve 1-3% volume accuracy on stockpiles, tighter than the 3-5% of a GPS walkover, because the UAV captures the entire surface rather than interpolating between walked points (Pix4D, 2024).
- The base-surface choice — surveyed toe plane, prior survey, or design surface — changes the reported volume more than instrument accuracy does, so ISS states it explicitly in every Karratha report.
- Work is flown under CASA Part 101 remote pilot accreditation, controlled to ICSM SP1 and referenced to GDA2020 / MGA Zone 50, with airspace around Karratha Airport and the Burrup industrial precinct planned for in advance.
- Typical Karratha volumetric engagements run from roughly AUD 2,500 for a single site to $18,000+ for a full multi-stockyard programme, with repeat-contract rates lower for monthly reconciliation cycles.
Volumetric surveying in Karratha and the West Pilbara
Karratha is the service capital of the Pilbara coast — a city of around 16,000 people ringed by some of the highest-throughput bulk-handling infrastructure on earth. Where the inland Pilbara towns of Newman and Tom Price are about pits and haul roads, Karratha is about what happens at the coast: ore arriving by rail and stockpiling before it is loaded onto Capesize vessels, salt drying in vast evaporation fields, and aggregate being won from local quarries to feed continuous LNG and port construction. Every one of those processes turns on knowing, accurately, how much material is sitting in a pile.
That is the job of a volumetric survey in Karratha. A volumetric survey measures the volume of material in a stockpile, pit or earthwork against a defined base surface, reported in cubic metres and — where bulk density is known — converted to tonnes. The number drives real money: stockpile inventory carried on the balance sheet, production reconciled against the plan, royalties and demurrage, and progress claims paid to earthworks contractors. On a Pilbara iron ore stockyard holding hundreds of thousands of tonnes, a 5% measurement error is not a rounding difference — it is tens of thousands of tonnes of unaccounted ore.
Key point: On the Karratha coast the value at stake in a single stockyard reconciliation dwarfs the cost of the survey. The expensive mistake is not paying for a volumetric survey — it is running inventory and contractor payments off a tape, a walked GPS line, or last quarter's number.
Local applications: ore stockyards, salt, quarries and earthworks
The Karratha cluster generates distinct volumetric needs across very different material types, and ISS scopes each one to its actual behaviour rather than treating every pile as the same problem.
Iron ore stockyards — Dampier and Cape Lambert
Rio Tinto exports iron ore through the Dampier port (Parker Point and East Intercourse Island) and the Cape Lambert terminals north-east of Karratha, with BHP and Fortescue shipping from the wider Pilbara network. The stockyards feeding these terminals hold product and run-of-mine ore in long, machine-built piles shaped by stackers and drawn down by reclaimers. Volumetric survey here is about month-end inventory reconciliation — comparing surveyed stockpile volume against the production and shipping records — and about checking stacker/reclaimer build-out against design. A single drone flight can capture 20-50 piles across a stockyard in a morning, far faster than walking each one and without putting a surveyor under live machinery.
Solar salt — Dampier Salt
Dampier Salt's solar evaporation operation crystallises salt across enormous coastal ponds and harvests it into stockpiles before ship loading. Salt presents its own volumetric challenges: bright, low-contrast surfaces that test photogrammetry, and harvested piles whose bulk density shifts with moisture. ISS plans capture and ground control specifically for these conditions and reports the density basis used so the tonnage figure is defensible.
Quarries, aggregate and civil earthworks
The continuous construction across the Burrup Peninsula, the Gap Ridge and Karratha industrial estates, and the ongoing LNG and port expansions all consume aggregate from local hard-rock quarries and move large volumes of bulk earth. Volumetric survey supports quarry stock measurement, pit progression and cut/fill reconciliation, and progress-claim verification on earthworks contracts — measuring what has actually been moved against the design surface before a payment is certified.
Method and equipment
ISS selects the volumetric method to suit the site, the accuracy required and the access constraints. On the Karratha coast that usually means drones for open stockyards and pits, GPS for small or simple stocks, and terrestrial laser scanning where a pile is hard against structures or machinery.
- UAV photogrammetry and LiDAR — ISS flies RTK/PPK-enabled aircraft, principally the DJI Matrice 350 RTK with a P1 photogrammetry payload and the Zenmuse L2 LiDAR sensor. Photogrammetry suits most ore and aggregate stocks; LiDAR is chosen where vegetation, dust or low-contrast salt surfaces degrade photo matching. Data is processed in Pix4D, Propeller and Trimble Business Center against surveyed ground control.
- GNSS/GPS walkover — for a single small pile or a quick check, a survey-grade RTK rover captures the surface directly. Faster to mobilise, but it interpolates between walked points, so accuracy sits in the 3-5% band rather than 1-3%.
- Terrestrial laser scanning — where a stockpile sits against a wall, shed or live conveyor and a drone cannot get clean coverage, a scanner from our laser scanning service captures the surface from safe standoff and merges with aerial data.
Every job follows the same disciplined sequence: establish or check ground control tied to your site grid; capture the full stockpile surface; process into a digital surface model; compute volume against the agreed base surface; and report with quality metrics. The base surface — a surveyed toe plane, a prior survey for change detection, or a design surface for cut/fill — is agreed before flying, because it moves the answer more than the instrument does. Coordinates are referenced to GDA2020 / MGA Zone 50 or your existing mine or plant grid. For the full technical treatment of the technique see our drone volumetric survey page.
Standards and compliance
Volumetric deliverables on Karratha sites sit inside a real standards and regulatory framework, and ISS works to it rather than around it:
- CASA Part 101 governs all drone operations. ISS flies under current remote pilot accreditation and an operator's certificate, observes the airspace constraints around Karratha Airport and the Burrup industrial precinct, and obtains the approvals needed to operate near active port and LNG facilities.
- ICSM SP1 (Standard for the Australian Survey Control Network) governs how the ground control underpinning each volume is established and reported, so the surface model is positioned and accurate to a defensible standard.
- GDA2020 datum and MGA Zone 50 are the horizontal reference for the West Pilbara; surfaces are routinely registered to a client's local stockyard or plant grid where one exists.
- AS/NZS survey practice underpins the accuracy reporting and the bulk-density basis stated with each tonnage figure, so the deliverable stands up to internal reconciliation, auditor scrutiny and contractor dispute.
Because the work is performed and supervised by qualified surveyors — not just flown — the volume figures are suitable for inventory accounting, production reconciliation and payment certification, not merely visual estimates.
Why ISS for volumetric survey in Karratha
Industrial Spatial Solutions services the Pilbara coast on a fly-in/fly-out basis from Perth, mobilising drone and survey crews to align with your roster cycles and reporting cadence. Stockpile reconciliation is usually a recurring need — monthly for active stockyards — so we plan repeat volumetrics on a fixed schedule and deliver into the same format every cycle, which is what makes the trend data useful.
What sets ISS apart for Karratha volumetrics is the combination of UAV capability with full survey competence. Plenty of operators can fly a drone over a pile and press a button; far fewer can establish the control network, defend the base surface and density assumptions, and stand behind a tonnage figure that finance and auditors will rely on. We deliver in mine- and plant-ready formats — DWG/DXF, Civil 3D, LandXML, and the volume reports your reconciliation process expects — referenced to your stockyard grid so the numbers slot straight into your systems. Our crews hold current WA site inductions and work under your safety management system, including the isolation, permit and heat-stress protocols that Pilbara port and salt operations demand. For the regional picture, see our Karratha and Pilbara survey hub; for technical depth, see our volumetric surveying service.
Frequently asked questions
How accurate is a volumetric survey in Karratha?
For most ore, salt and aggregate stockpiles a well-controlled drone survey delivers 1-3% volume accuracy, captured against ground control tied to ICSM SP1 practice. A GPS walkover on a small or simple pile sits in the 3-5% band because it interpolates between walked points rather than capturing the whole surface. We report the achieved accuracy, the base surface used and the density basis with every deliverable so the tonnage figure is fully traceable.
Can ISS survey our stockyard while it stays operational?
In most cases, yes. Drone volumetrics are flown from the air with the operation running, so there is no need to stop stacking or reclaiming for a routine reconciliation — and no surveyor walking under live machinery. We coordinate the flight window, airspace approvals and any required isolations with your site so capture happens safely around normal operations. Where a pile is hard against structures, we supplement with terrestrial scanning.
How quickly can a crew mobilise to the Pilbara coast?
ISS mobilises to Karratha on a FIFO basis from Perth, coordinated with your roster and reporting cycle. For monthly reconciliation programmes we lock in recurring dates; for one-off or urgent stock checks we move as flights and inductions allow. Bringing backup aircraft and consumables north is standard so a single equipment fault does not cost you a mobilisation.
Why does the tonnage figure matter as much as the volume?
Because reconciliation, royalties and payments are done in tonnes, not cubic metres. The survey measures volume directly and accurately; converting to tonnes depends on the bulk density, which shifts with material type and moisture — Pilbara salt and run-of-mine ore behave very differently. ISS states the density basis used for every conversion so the figure is defensible, and where you supply a measured density we apply yours rather than an assumed value.
Request a quote
If you are running iron ore stockyards, salt fields, a quarry, or bulk earthworks on the Karratha coast and need volumes you can reconcile and pay against, talk to a surveyor who understands Pilbara operations and volumetric survey in Karratha.
Call ISS on 0407 057 015 to scope your volumetric programme. We will discuss the sites, the stockpile count, the access and airspace constraints, the base surface and density basis, and the report format you need, then issue a methodology, equipment list and fixed-price quote tailored to your operation. For ongoing reconciliation across multiple Karratha and Pilbara stockyards, we offer annual agreements with preferential scheduling and dedicated crew allocation.
Industrial Spatial Solutions — FIFO-capable, mine-ready, survey-grade.