TL;DR
A conveyor survey for mining measures the geometric condition of belt conveyors — gantry straightness, pulley alignment, idler frame squareness, and structural deformation — so operators can stop tracking belts, premature roller wear, and spillage before they cost production. Industrial Spatial Solutions delivers conveyor alignment surveys, structural as-built laser scanning, and mechanical surveys for overland, in-plant, and shiploader conveyors across Australian mine sites, with results in your site grid (MGA2020/AHD) and millimetre tolerances.
Key takeaways
- A single overland conveyor at a Pilbara iron ore operation can run 5–20km; a 1mm-per-metre alignment drift across a long flight compounds into belt mistracking, edge wear, and material spillage that drives unplanned shutdowns.
- ISS surveys conveyor centreline, structure straightness, pulley parallelism and idler frame squareness to typical tolerances of ±1mm to ±3mm, referenced to your operation's local grid or GDA2020/MGA2020 with AHD heights.
- Conveyor downtime is among the most expensive in mining — an iron ore shiploader or trunk conveyor stoppage can hold up an entire export chain, so a half-day alignment survey during a planned shut routinely pays for itself.
- ISS uses Leica TS16/TM60 total stations, the Leica RTC360 and FARO scanners for as-built point clouds, and DJI Matrice RTK platforms (CASA Part 101) for structure and gantry inspection over inaccessible spans.
- Deliverables integrate directly into maintenance and engineering workflows — DXF/DWG, LandXML, E57/LAS point clouds, and alignment reports compatible with the same packages your mine planning team already uses.
Table of contents
- Why conveyor surveys matter in mining
- What a conveyor survey actually measures
- Overland, in-plant and shiploader conveyors
- Methods, equipment and tolerances
- Standards, datums and compliance
- How ISS runs a conveyor survey
- Frequently asked questions
- What to do next
Why conveyor surveys matter in mining
Belt conveyors are the circulatory system of an Australian mine. From the run-of-mine bin through crushing, screening, stockpiling and out to the shiploader, almost every tonne moves on a belt at some point. In the Pilbara, BHP, Rio Tinto and Fortescue run overland conveyors measured in kilometres; in the Bowen Basin and Hunter Valley, coal handling and preparation plants (CHPPs) depend on dense networks of transfer, stacking and reclaim conveyors. Iron ore alone earned roughly $116 billion in export income in FY2024–25, and that material reached port on conveyors.
The problem is that conveyors drift. Structures settle on their footings, gantries sag under load and thermal cycling, pulleys creep out of square, and idler frames are knocked out of alignment during maintenance. Individually these movements are tiny. Collectively they cause the belt to track off-centre, which produces edge fraying, accelerated idler and pulley wear, carryback, and spillage that builds up under the structure and becomes a housekeeping and fire-risk problem in coal applications.
Key point: Most conveyor "belt tracking" problems are not belt problems at all — they are geometry problems. A belt steers toward the side where it contacts the idler roll first, so a structure that is out of straightness or a pulley that is out of square will mistrack a perfectly good belt. A conveyor survey finds the geometric cause rather than treating the symptom with training idlers.
The financial logic is simple. An unplanned trunk conveyor or shiploader stoppage at a major export operation can stall the entire downstream chain — train unloading, stockpile reclaim and vessel loading — at a cost that runs into six figures per day. A planned alignment survey, by contrast, is a half-day to two-day job booked into a maintenance window. The asymmetry is why survey-led conveyor maintenance has become standard practice on well-run sites.
What a conveyor survey actually measures
A conveyor is a precision machine stretched over a long, flexible structure, so a proper survey captures both the structure and the rotating components mounted on it.
Conveyor centreline and structure straightness
ISS establishes a survey-controlled centreline down the full length of the conveyor and measures the structure's deviation from it — horizontally and vertically. On a long overland flight this reveals where the truss has bowed, where bents (support legs) have settled, and where the stringers are no longer parallel. We report deviation as offset values at each station, typically to ±1–2mm, so maintenance can shim, jack or re-level the structure to bring it back into specification.
Pulley alignment and squareness
Head, tail, drive, bend and take-up pulleys must sit square to the conveyor centreline and parallel to each other. A pulley out of square by even a fraction of a degree steers the belt. ISS measures each pulley's axis relative to the surveyed centreline, reporting squareness and level so fitters can adjust to tolerance — usually ±1mm across the pulley face.
Idler frame alignment
Carry and return idler frames are surveyed for squareness to the centreline and for tilt. Misaligned idler sets are the most common in-the-field cause of mistracking, and because there are thousands of them on a long conveyor, a systematic survey is the only reliable way to find the offenders.
Take-up, transfer and chute geometry
Gravity and winch take-up towers, transfer points and chute work are scanned and measured for position, plumb and clearance — critical where worn liners or shifted chutes are causing flow problems, blockages or off-centre loading that drives downstream mistracking.
Gantry and structural deformation monitoring
For ageing structures, ISS can establish monitoring marks and re-survey periodically to detect progressive movement — footing settlement, gantry deflection or corrosion-driven sag — before it becomes a structural or safety issue.
Overland, in-plant and shiploader conveyors
Different conveyor types in mining demand different survey approaches.
| Conveyor type | Typical site | Survey focus | ISS method |
|---|---|---|---|
| Overland trunk conveyor | Pilbara iron ore, Bowen Basin coal | Long-run centreline, bent settlement, pulley square | Total station traverse + GNSS control |
| CHPP / processing plant conveyors | Hunter Valley, Bowen Basin | Transfer geometry, congested structure as-built | Laser scanning + total station |
| Stacker / reclaimer conveyors | Port stockyards, Gladstone, Port Hedland | Boom alignment, slew geometry, rail | Crane and rail survey techniques |
| Shiploader conveyors | Port Hedland, Hay Point, Newcastle, Gladstone | Boom belt alignment, luffing/slewing clearance | Total station + UAV inspection |
| Tunnel / underground conveyors | Illawarra, Bowen Basin longwall | Confined-space alignment, drift gradient | Total station, scanning |
Overland conveyors are the signature challenge of Western Australian iron ore. A flight running tens of kilometres needs a rigorous control framework — GNSS-established control points tied to the mine grid, with total station traverses bridging between them — so that straightness is measured against a single consistent reference rather than accumulating error from one bent to the next.
In a CHPP, the problem is the opposite: short, congested, overlapping conveyors packed into steel structure where line of sight is poor. Here ISS leans on terrestrial laser scanning, capturing the entire transfer house as a point cloud, then extracting centrelines, pulley positions and clearances from the model. Shiploader and stacker/reclaimer conveyors at export ports such as Port Hedland, Hay Point and the Port of Newcastle combine conveyor alignment with travel-rail and slew-bearing geometry — work that overlaps directly with our crane rail survey capability.
Methods, equipment and tolerances
Conveyor surveying is precision mechanical surveying, and the method is matched to the accuracy required and the access available.
Total station survey is the backbone of conveyor alignment. ISS uses Leica TS16 and TM60 monitoring-grade total stations with automatic target recognition, achieving sub-millimetre repeatability on controlled setups. For centreline, pulley and idler work, total station measurement against an established control network is the most accurate and defensible method, with reported tolerances of ±1mm to ±3mm depending on the component.
3D laser scanning with the Leica RTC360 (up to two million points per second) and FARO scanners captures congested plant structure where individual point pick-up would be slow or unsafe. The resulting point cloud is a permanent as-built record — invaluable for clash detection on conveyor upgrades, brownfield design, and digital twin programs. Scanning also documents chute and transfer geometry that conventional survey cannot reach.
UAV / drone inspection under our CASA Part 101 approvals lets ISS photograph and model overland conveyor structure, gantries and elevated shiploader booms without scaffolding or rope access. Drone-derived imagery and photogrammetry supports structural condition assessment and gives surveyors safe coverage of spans crossing haul roads, gullies and water.
Control and datum underpins all of it. ISS establishes survey control in your operation's local mine grid, or in GDA2020/MGA2020 with AHD heights where the site works in national datums, so conveyor survey results sit consistently alongside your other site data.
| Component | Typical tolerance | Primary method |
|---|---|---|
| Structure straightness (horizontal/vertical) | ±1–2mm per station | Total station |
| Pulley squareness to centreline | ±1mm across face | Total station |
| Idler frame squareness | ±2–3mm | Total station |
| As-built clearance / chute geometry | ±3–5mm | Laser scanning |
| Long-run centreline reference | sub-10mm over full length | GNSS + total station traverse |
Standards, datums and compliance
Conveyor surveys sit at the intersection of engineering metrology and site safety. The geometric work is governed by manufacturer alignment specifications and good engineering practice rather than a single prescriptive standard, but several frameworks apply.
Belt conveyor design and safety in Australia reference AS 1755 (Conveyors – Safety requirements) and the relevant AS/ISO structural standards, and any survey feeding a structural assessment is reported so it can be checked against those design tolerances. Where ISS performs as-built scanning or deformation monitoring, work is delivered under quality processes aligned with AS/ISO measurement principles, with instruments calibrated and traceable.
Coordinate and height data is referenced to GDA2020 / MGA2020 and AHD where the site uses national datums, or transformed into the operation's established local mine grid — the same framework ISS uses for mining survey control so conveyor data integrates with pit, plant and infrastructure surveys. Any drone work over a live mine site is conducted under CASA Part 101 remotely piloted aircraft rules, with site-specific risk assessment and approvals.
Key point: The most common gap we see is conveyor maintenance carried out against the belt with no reference to the structure. Training idlers and belt steering can chase a tracking problem for months. A survey-grade centreline and pulley check, referenced to a fixed datum, turns guesswork into a measured adjustment list — and gives the reliability engineer a baseline to re-survey against next shut.
ISS field staff hold current mine site inductions and work within each operation's safety management system, including isolation, working-at-heights and confined-space requirements for tunnel and transfer-house conveyors.
How ISS runs a conveyor survey
ISS structures every conveyor survey mining engagement around your maintenance window, because conveyor access almost always means the belt is stopped and isolated.
1. Scope and control. We review the conveyor drawings and your objective — chronic mistracking, a structural concern, an upgrade design, or routine condition assessment — and establish survey control tied to your mine grid or MGA2020/AHD.
2. Field measurement. During the planned shut, ISS measures centreline, structure straightness, pulley alignment, idler squareness and take-up/chute geometry using total stations, supplemented by laser scanning in congested areas and drone capture for elevated or inaccessible structure.
3. Analysis and reporting. We compute deviations against the design centreline and component tolerances, and deliver a clear alignment report: offset tables by station, plots of structure deviation, a prioritised adjustment list for fitters, and — where scanned — an E57/LAS point cloud and DXF/DWG/LandXML as-built.
4. Verification. After adjustments, ISS can re-measure critical components to confirm they are within tolerance before the belt is recommissioned, and establish monitoring marks for future re-survey.
Because ISS owns its total stations, scanners and drones, there are no hire-equipment delays, and crews mobilise to site — including FIFO to remote Pilbara, Goldfields and Bowen Basin operations — on your roster, not ours.
Frequently asked questions
How often should a mining conveyor be surveyed?
For critical trunk, overland and shiploader conveyors, an annual alignment survey during a major shut is a sensible baseline, with additional surveys triggered by persistent mistracking, after structural repairs, or following a settlement event. Long overland conveyors and ageing structures often justify periodic deformation monitoring between full surveys. ISS can build a survey program that aligns with your planned maintenance cycle so the work never sits on the critical path.
Does the conveyor have to be stopped for the survey?
For full alignment work — pulley squareness, idler frames, structure straightness with target pick-up — yes, the belt must be stopped and isolated, which is why we schedule into a planned shut. However, laser scanning of surrounding structure and drone inspection of gantries and elevated spans can often be done while the belt runs, capturing useful as-built and condition data ahead of the shut.
What accuracy can ISS achieve on conveyor alignment?
Using monitoring-grade total stations against established control, ISS reports structure straightness and pulley squareness to ±1–3mm, and long-run centreline references to better than 10mm over the full conveyor length. Laser-scanned clearance and chute geometry is typically ±3–5mm. Exact tolerances are agreed against the conveyor's design specification before mobilisation.
Can you survey overland conveyors several kilometres long?
Yes. Long overland conveyors are routine in Pilbara iron ore and Bowen Basin coal operations. ISS establishes a GNSS-tied control framework along the route and runs total station traverses between control points, so straightness is measured against one consistent reference for the whole flight rather than accumulating error span by span. Drone capture covers elevated and inaccessible sections safely.
How are the results delivered?
ISS provides an alignment report with station-by-station offset tables, structure deviation plots and a prioritised fitter adjustment list, plus survey data in your preferred formats — DXF/DWG, LandXML, CSV/XYZ, and E57/LAS point clouds where scanning is used. Everything is supplied in your site grid or MGA2020/AHD so it drops straight into your existing engineering and maintenance systems.
What to do next
Conveyor reliability is production reliability. If a belt is tracking, spilling, wearing edges or eating idlers, the cause is almost always geometric — and a conveyor survey will find it and give your maintenance team a measured, defensible list of adjustments instead of trial and error.
- Call us on 0407 057 015 to discuss the conveyor, the symptoms and your next maintenance window
- Send through the conveyor drawings — we'll scope the control, method and access requirements
- Get a fixed-quote proposal — clear deliverables, tolerances and timing booked into your planned shut
ISS works on conveyors across every Australian mining region, from Pilbara overland flights and Goldfields processing plants to Bowen Basin CHPPs and the shiploaders at Port Hedland, Hay Point and Newcastle. We own our equipment, hold current site inductions, and deliver survey data that integrates directly with your engineering systems.
Industrial Spatial Solutions — precision conveyor surveys for Australian mining. Call 0407 057 015 or request a quote online.
Related: Mechanical surveys for mining | 3D laser scanning | Mining surveying overview