Outage Surveys — Kalgoorlie

TL;DR: A shutdown survey Kalgoorlie operators can schedule is precision measurement delivered inside the fixed window when a Goldfields processing plant, mill or kiln is taken offline for maintenance. With a continuous gold or rare-earths line losing $50,000 or more an hour while it sits idle, the survey work has to be planned to the hour, executed to sub-millimetre tolerances, and kept off the critical path — across SAG and ball mill relines at Fimiston and Mungari, the Lynas Kalgoorlie rare-earths kilns, and the crusher and conveyor change-outs that punctuate every planned outage in the region.

Key takeaways

• A shutdown survey in Kalgoorlie is dimensional control, alignment and as-built measurement scoped to a time-bound outage — a mill reline, a crusher or kiln change-out, a roaster inspection — where the asset earns nothing until it restarts, so the survey is engineered around the window rather than the other way round.
• ISS achieves ±0.3–1.0 mm alignment accuracy, ±0.02–0.05 mm coaxiality with a FARO laser tracker, and 2–6 mm at 50 m laser-scan accuracy using Leica MS60 MultiStation, TS16 robotic total stations and RTC360 scanners, all calibrated to ISO/IEC 17025 and traceable to national standards.
• Goldfields outages cluster around mineral processing — girth-gear and pinion alignment on SAG and ball mills, primary crusher seating, the Lynas cracking-and-leaching kilns, and the Fimiston roaster precinct — every one of which is survey-dependent and unforgiving on time.
• The 595 km haul from Perth and remote satellite sites make redundant instrumentation and locked-in scheduling non-negotiable: a single equipment failure or a late scope discovery can blow a window that already cost a charter flight to reach.
• A limited-scope Kalgoorlie shutdown survey starts around AUD $15,000; a full mill-reline or turnaround program with continuous attendance and scanning can exceed $60,000 — recovered the moment it prevents one re-lift or one shift of extended downtime.

Shutdown surveys in the Goldfields

Kalgoorlie-Boulder sits 595 kilometres east of Perth at the centre of Australia's most productive gold region, and almost every ounce that leaves the Goldfields passes through a processing plant that shuts down on a schedule. The Super Pit feeds the Fimiston mill and the Gidji roaster; Evolution Mining's Mungari CHPP draws from multiple ore sources; Northern Star's Kanowna Belle and Kundana run their own circuits; and on the city's outskirts the Lynas Kalgoorlie Rare Earths Processing Facility cracks and leaches mixed rare-earth carbonate through rotary kilns. None of this plant runs forever. Mills are relined, kilns are inspected, crushers are rebuilt, and the moment a continuous line goes cold the operator starts losing money.

A shutdown survey — also called an outage or turnaround survey — is the alignment, fit-check and as-built measurement carried out while that plant is offline. The defining constraint is not accuracy in the abstract; it is the window. A SAG mill reline at Fimiston or Mungari opens an alignment opportunity that closes again the moment the shell is bolted up, and the survey crew has to be ready the hour the area is clear, not the day after. The work establishes a stable measurement reference that survives the whole outage, then measures equipment against that reference at each stage — before disassembly, during rebuild, and after completion — so the maintenance team signs off on verified geometry rather than tape, feeler gauge and memory.

This page covers how that service is delivered across Kalgoorlie and the surrounding Goldfields: where it applies, the method and equipment ISS uses, the standards and tolerances, and why an independent surveyor is the right choice for remote-site outage work. It is the local companion to our outage survey services page and our Kalgoorlie mining survey hub.

Key point: A shutdown survey is not a routine alignment job that happens to fall during an outage. Crew size, instrument selection, reporting cadence and even which method is chosen are all set by the schedule. In Kalgoorlie, where mobilising a second crew or a replacement instrument means a flight from Perth, that planning discipline is the difference between protecting the window and quietly blowing it.

Local applications and sites

The Goldfields' outage workload is dominated by mineral processing, with two distinct populations of high-value rotating and fixed plant that ISS surveys.

Gold processing — mills, crushers and roasters

The grinding circuit is the heart of every gold plant and the single most survey-critical item in a shutdown. SAG and ball mill relines at the Fimiston mill (KCGM, managed by Northern Star) and the Mungari CHPP (Evolution Mining, ~20 km west of Kalgoorlie) open the only window in which girth-gear-to-pinion alignment, trunnion bearing geometry and foundation flatness can be verified. Get the gear mesh wrong and the mill chews bearings and pinion teeth for the rest of the campaign. Primary crushers — gyratory and jaw — require precise seating and drive-train alignment that drifts under the constant impact of run-of-mine feed. The Gidji roaster precinct, where refractory and internals can only be measured cold and open, is a textbook case for comprehensive in-outage scanning.

Critical-minerals and rare-earths kilns

The Lynas Kalgoorlie Rare Earths Processing Facility brought industrial-scale rotary kilns to the Goldfields. Its cracking-and-leaching circuit runs large-diameter rotating equipment at elevated temperature in a corrosive, dust-laden duty — exactly the conditions in which support-roller geometry drifts fastest. Kiln tyre and roller positions, shell alignment and tie-in fit-up during a planned outage are all survey-dependent, and the same discipline applies to lime calciners and concentrate dryers feeding the region's CIL and CIP circuits.

Method and equipment

Outage survey equipment has to be accurate, portable, fast to deploy and tolerant of Goldfields heat, dust and vibration. ISS selects the instrument to the task and the schedule, never by default, and carries redundant kit to site because the nearest spare is a Perth flight away.

• Robotic total station and MultiStation — The Leica TS16 (±1 mm + 1.5 ppm, 1" angle) and the Leica MS60 MultiStation handle control, alignment and setout. The MS60 combines angle, distance and scanning in one instrument, which matters when setup time is the constraint. Automatic Target Recognition keeps the surveyor clear of exclusion zones around active lifts.
• 3D laser scanning — The Leica RTC360 captures dense point clouds at 2–6 mm accuracy at 50 m with a full setup in under two minutes. It is the fastest route to comprehensive as-built capture of roaster internals, mill pipework and structural steel, and the method of choice for fit-check of replacement modules and clash detection on tie-in work.
• Laser tracker — For the tightest alignment — mill trunnion bores, girth-gear runout, machined seating faces — a FARO laser tracker delivers ±0.015–0.025 mm at typical working ranges, the accuracy a total station cannot reach.
• Reflectorless and portable control — Reflectorless measurement reaches hot or inaccessible points without target placement; quickly recovered control serves repeated measurement cycles across a multi-day outage.

ISS runs every Kalgoorlie shutdown survey to a five-phase protocol: scope definition and methodology four to six weeks out, control-network establishment one to two weeks pre-outage, pre-outage baseline capture, in-outage execution measured in sequence with mechanical activity, and post-outage verification before recommissioning. Critical results — anything a lift or a coupling decision depends on — are reported verbally and in writing on the spot, so the formal report never holds up the line.

Key point: Scanning and total-station work are complementary on an outage. The RTC360 captures the whole condition for as-built and fit-check; the total station and tracker deliver the sub-millimetre numbers the mechanical team signs against. Using one where the other belongs either wastes window time or undershoots the tolerance — and in a Kalgoorlie outage, wasted hours are charged at the plant's lost-production rate, not the survey rate.

Accuracy and standards

Shutdown survey accuracy is matched to the engineering tolerance of the task, then verified against the relevant standard.

All instruments are calibrated to ISO/IEC 17025 and measurements are traceable to national standards, with measurement uncertainty statements provided alongside alignment deliverables. Where the work touches structural or conveyor geometry, results are assessed against the relevant Australian Standard — AS 4100 for steel structures, AS 1418 for cranes and lifting equipment used in the lift plan — and against project or OEM tolerances where they are tighter than the code. UAV inspection support over high or inaccessible plant during the outage is flown by CASA-licensed operators under the relevant remote-pilot rules.

Why ISS for Goldfields outages

Western Australia's surveyor shortage is acute — 151,000 resources jobs and the highest resources share of any state economy at 43.6% — and securing reliable shutdown survey support in the Goldfields means working with specialists who understand mining, not generalists who happen to own a total station. ISS treats the outage window as the project constraint and engineers the survey around it. We lock scope four to six weeks out, establish control before the area is congested, and schedule attendance against the work list so measurement is ready the moment an area is — never before, never after.

Remoteness shapes everything we do here. We coordinate projects through Kalgoorlie to minimise mobilisation time, mobilise FIFO from Perth for larger turnarounds, and carry redundant instrumentation so a single failure never stops the line when the nearest replacement is 595 kilometres away. Our surveyors hold current confined-space, working-at-heights and site-specific certifications for mineral-processing environments, and because we are independent of any OEM we align and verify mills, kilns and crushers from any manufacturer using consistent methodology. Deliverables come in Surpac, Vulcan, Deswik, AutoCAD or your preferred format, in your plant grid or GDA2020 as required.

A typical package includes a pre-outage baseline report, in-outage alignment reports with deviation tables issued as each activity completes, fit-check and clearance go/no-go confirmations, as-built survey plans, registered laser-scan data (E57, RCP or native), a recommissioning compliance summary issued before restart, and a consolidated full report within 5–10 business days.

Watch out: The most common cause of a survey-driven outage overrun is not measurement error — it is scope discovered too late. Treating the surveyor as a day-of call-out rather than a planned, scheduled resource almost guarantees lost hours waiting for control, access or line of sight, and in Kalgoorlie those hours cannot be recovered with a quick second mobilisation.

Frequently asked questions

How quickly can ISS mobilise for a shutdown survey in Kalgoorlie?

For planned outages we want four to six weeks' notice to define scope, complete a pre-outage site visit, prepare safety documentation and schedule the crew. For urgent or extended-scope work mid-outage, we mobilise FIFO from Perth on commercial or charter flights, typically within 24–48 hours. Because we coordinate through Kalgoorlie, sites within the immediate region carry shorter lead times than fully remote satellite operations.

What accuracy do you achieve during a Goldfields mill reline?

Mill and rotating-equipment alignment is typically ±0.3–1.0 mm with the Leica TS16 and MS60, and ±0.02–0.05 mm for girth-gear runout, pinion mesh and coaxiality using the FARO laser tracker. As-built scanning with the RTC360 is 2–6 mm at 50 m. All instruments are ISO/IEC 17025 calibrated and every alignment deliverable carries a measurement uncertainty statement.

Can the shutdown survey be done without extending our outage window?

Yes — that is the entire point. A well-planned shutdown survey runs parallel to mechanical activity and stays off the critical path: the surveyor measures when an area is ready and reports before the next activity needs the result. Overruns come from late scope and missing control, both of which the four-to-six-week planning cycle eliminates. We establish control before scaffolding and demolition congest the area, which is the single biggest time-saver during the outage itself.

Is ISS certified to work on Kalgoorlie mine and processing sites?

Yes. Our field staff hold current site access, confined-space, working-at-heights and site-specific inductions for Goldfields mineral-processing environments, including major operations such as Fimiston, Mungari and the Lynas facility. As an OEM-independent surveyor we can align and verify equipment from any manufacturer, and our deliverables are issued in the mine-ready formats your engineering and maintenance teams already use.

Request a quote

Outage windows in the Goldfields do not wait, and the difference between a shutdown survey that protects your window and one that derails it is planning, credentials and the right instrument for each task. If you have a mill reline, kiln inspection, crusher change-out or full turnaround coming up at Fimiston, Mungari, the Lynas Kalgoorlie facility or any Goldfields plant, talk to ISS early. Call 0407 057 015 to scope your Kalgoorlie shutdown survey with a surveyor who understands Goldfields processing and to request a fixed-price quote.