TL;DR
A shutdown survey mining program delivers millimetre-accurate alignment, fit-check, and as-built measurement during the fixed maintenance window when a mine's fixed plant stops production. With concentrator and processing shutdowns costing AUD $50,000–200,000 per hour in deferred throughput, survey work that drifts onto the critical path is the most expensive mistake on the job. Industrial Spatial Solutions plans, mobilises, and executes shutdown surveys across Australian mine sites so measurement never becomes the bottleneck.
Key takeaways
- A SAG or ball mill reline shutdown typically runs 36–96 hours; an alumina or processing turnaround 7–21 days. At AUD $50,000–200,000 per hour of deferred production, a single shift of survey rework can cost more than the entire survey scope.
- The high-value shutdown survey scopes in mining are mill girth gear and pinion alignment, kiln tyre and roller checks, crusher and conveyor structure alignment, and rapid as-built laser scanning for tie-ins and equipment replacement.
- Leica RTC360 scanning captures a full mill or transfer chute as-built in minutes per setup, against the hours a total-station pick-up would take inside a live critical path.
- Survey datums must tie to the mine grid or MGA2020 / GDA2020 with AHD heights so shutdown measurements reconcile against design and prior alignment records.
- Scope locked 4–6 weeks out, control pre-established before the outage, and crews inducted for the site — these three things separate a clean shutdown from a blown one.
Why mining shutdowns demand precision surveying
Mine fixed plant — concentrators, crushing and screening circuits, kilns, conveyors, stackers and reclaimers, ship loaders — runs continuously until a planned shutdown stops it. Shutdowns are scheduled deliberately because the cost of stopping is enormous: a Pilbara iron ore processing train or a Bowen Basin coal handling plant defers tens of thousands of tonnes per day, and a copper or gold concentrator's SAG mill is the single most expensive asset to have idle. Industry maintenance benchmarks put deferred production at AUD $50,000–200,000 for every hour the plant is down.
Shutdown surveying differs fundamentally from routine mine surveying. There is no flexibility in the schedule. The surveyor measures when the mechanical crew has the area ready — not before, not after — and the result must be issued before the next activity can start. A mill cannot be closed up until girth gear root clearance and axial float are signed off; a new conveyor module cannot be set until the structure alignment is verified; a kiln cannot be fired until tyre and roller positions are confirmed within tolerance. Survey is woven into the mechanical sequence, and a delayed measurement delays everything downstream.
The consequences of getting it wrong compound fast. A mill closed up on an out-of-tolerance gear mesh will run hot, shed teeth, and force an unplanned re-stop — a multi-million-dollar event. A conveyor structure set to the wrong line drifts the belt and spills product from day one of recommissioning. The discipline that prevents this is unglamorous: pre-established control, verified datums, and a methodology agreed before the gate is open.
| Do | Don't |
|---|---|
| Lock survey scope 4–6 weeks before the shutdown date | Decide survey scope during the outage when the clock is running |
| Establish and verify control before the plant stops | Try to set control in a congested, crane-blocked work area |
| Tie every measurement to the mine grid / MGA2020 with AHD | Mix local arbitrary datums between pre- and post-work surveys |
| Capture a full laser scan while the equipment is open and accessible | Re-mobilise weeks later when the only access window has closed |
Mining shutdown survey applications
Mining turnarounds concentrate the most demanding mechanical survey work into the shortest possible window. The applications below recur across iron ore, coal, copper, gold, and alumina operations.
Mill alignment — SAG, ball, and rod mills
The grinding circuit is the heart of most concentrators, and the mill reline shutdown is where survey precision pays off hardest. ISS measures girth gear to pinion alignment (root clearance and backlash), trunnion bearing levels, and shell ovality, then verifies the result before the mill is closed up. Tolerances here are tight — girth gear axial and radial runout is typically held to fractions of a millimetre over a gear several metres in diameter. Getting this signed off inside a 36–96 hour reline window is the difference between a clean recommission and a forced re-stop.
Kiln tyre, roller, and shell surveys
Rotary kilns in alumina refineries and cement plants, and rotary dryers across mineral processing, require tyre position, roller alignment, and shell ovality checks during the outage. ISS captures pre-shutdown baselines, then verifies positions after shell or refractory work so the kiln axis is true before firing. Hot kiln alignment is done while the unit turns; cold checks are folded into the shutdown sequence.
Crusher and conveyor alignment
Crushing circuits and the conveyor networks that feed them are survey-intensive during shutdowns. ISS provides crusher gaping and frame surveys, conveyor structure and stringer alignment, pulley and idler checks, and stacker/reclaimer and ship loader alignment at port sites. Correct alignment reduces belt drift, spillage, and premature component wear from the first hour of restart.
Rapid as-built laser scanning for tie-ins and replacement
When a shutdown involves new equipment, a tie-in, or a modification, the as-built condition must be captured while the plant is open. A Leica RTC360 captures a full mill, transfer station, or crusher house in minutes per setup, producing a registered point cloud for clash detection, spool generation, and replacement-component fit-up. This is often the only window in which the asset is accessible, so comprehensive capture during the outage protects every future engineering project. See outage survey services for the full scope.
Key point: The shutdown window is frequently the only time fixed plant is accessible for measurement. Scanning everything that is open — regardless of immediate need — turns a one-off cost into a reusable digital as-built that pays back on the next modification, audit, or capital project.
How ISS executes a mining shutdown survey
ISS structures every mining shutdown around a sequence that keeps survey off the critical path.
1. Scope definition (4–6 weeks out). We review the shutdown work list and schedule, flag every survey-dependent activity, and run a site visit to assess access, hazards, line of sight, and control requirements. The output is an agreed survey methodology and program.
2. Control establishment (1–2 weeks out). Control is set and verified against the mine grid or MGA2020 / GDA2020 with AHD heights, while the plant is still accessible and uncongested. Measurement is then immediately available the moment the area is handed over.
3. Pre-shutdown baseline. Equipment positions, alignments, and clearances are captured as the reference against which post-work measurements are compared.
4. In-shutdown execution. The surveyor attends in sequence with the mechanical crew — continuous standby for tight relines, scheduled attendance for specific checks on longer turnarounds — measuring as each work front becomes ready and issuing results before the next step.
5. Post-shutdown verification and reporting. Final alignment and as-built confirmation before recommissioning, with deviation tables and point-cloud deliverables issued in your coordinate system and formats compatible with downstream engineering and mine planning software.
ISS owns its instruments and scanners, so there is no waiting on hire equipment, and crews hold current mine site, confined space, and working-at-heights certifications for the environments we enter.
Equipment and tolerances
Shutdown survey gear has to be reliable, portable, and suited to confined, hot, dusty plant. ISS deploys instruments selected for that environment, calibrated annually and carried with regional backups so a single instrument fault never stalls a shutdown.
- Leica MS60 MultiStation — 1" angular precision combining total-station measurement, monitoring, and scanning in a single setup for alignment and verification.
- Leica TS16 total station — robust, fast, ATR automatic target recognition for general alignment and setout.
- Leica RTC360 laser scanner — around 2 million points per second for rapid as-built capture of mills, crushers, and transfer stations.
- FARO arm and reflectorless measurement — close-range fit-check and measurement to inaccessible points without target access.
Typical tolerances on mining shutdown work: mill girth gear root clearance and runout to fractions of a millimetre; conveyor and crusher structure alignment in the low millimetres; terrestrial laser scanning at roughly ±2 mm at 10 m; control and alignment networks at the millimetre level. Drone capture — flown by CASA Part 101 certified operators — supplements ground work for site-wide context and stockpile reconciliation around the shutdown.
Regulatory and safety standards
Shutdown environments are among the most hazardous survey workplaces in mining — confined spaces, residual heat, heavy lifting, mobile plant, and constant time pressure. Survey work is governed by the same Work Health and Safety (Mines) frameworks that apply to all site activity, and ISS works to instrument calibration aligned with AS/ISO metrology practice, with deliverables traceable from field measurement to final report under an ISO 9001 quality system.
Before mobilisation, ISS surveyors complete site-specific induction, task-based risk assessment, and the relevant confined space and hot work permits, and brief against the shutdown coordinator's communication plan. Coordinate and height work is referenced to GDA2020 / MGA2020 and AHD so survey data reconciles cleanly with design models and statutory records.
Key point: The most common shutdown survey failure we are called in to fix is not measurement error — it is access. A surveyor who cannot reach the control point because a crane is parked on it, or cannot enter the vessel because the permit is not raised, loses hours the schedule cannot give back. Planning access is survey work.
Frequently asked questions
What is a shutdown survey in mining?
A shutdown survey is precision measurement carried out during a planned mine plant outage — a mill reline, kiln repair, crusher rebuild, conveyor tie-in, or processing turnaround. It covers pre-shutdown baselines, in-shutdown alignment and fit-check, and post-shutdown as-built verification before recommissioning. The defining feature is the fixed window: every measurement is sequenced against mechanical work so it never delays the restart.
How far ahead should we book a mining shutdown surveyor?
Four to six weeks before the shutdown date. That allows scope definition, a pre-shutdown site visit, safety documentation, control establishment, and crew scheduling. Mill relines and major turnarounds are planned months out, and survey should be locked in as soon as the work list is firm. Short-notice bookings risk unavailable crews and rushed planning when the cost of delay is highest.
Can ISS work during a SAG mill reline?
Yes. Mill alignment is core shutdown work for ISS — girth gear and pinion alignment, trunnion bearing levels, and shell ovality, captured and verified inside the reline window. We attend on standby for the tight 36–96 hour relines so the gear mesh is signed off the moment the mechanical crew is ready to close up.
What accuracy does ISS achieve on shutdown alignment?
Mill girth gear alignment is held to fractions of a millimetre on runout and root clearance; conveyor and crusher structure alignment to the low millimetres; terrestrial laser scanning to roughly ±2 mm at 10 m. All work ties to the mine grid or MGA2020 with AHD so results reconcile against design and prior records.
Will survey work extend our shutdown?
Only if it is poorly planned. With control pre-established and scope locked early, survey runs parallel to mechanical activities and stays off the critical path. ISS measures when the work front is ready and reports before the next step starts — the surveyor is never the reason the plant stays down.
Request a quote
A mining shutdown is the wrong place to discover your survey support is under-prepared. ISS plans the scope, pre-establishes control, mobilises inducted crews with our own instruments, and delivers alignment, fit-check, and as-built data inside the window — so your turnaround restarts on schedule. We support shutdowns across iron ore, coal, copper, gold, and alumina operations Australia-wide, from the Pilbara and Kalgoorlie to the Bowen Basin and Hunter Valley. Call 0407 057 015 or request a quote online to scope your next mill reline, kiln repair, or processing turnaround.
Related: Mining surveying services | Outage survey services | Shutdown survey services Australia