Outage Surveys — Central West

TL;DR: A shutdown survey in the Central West is precision alignment, fit-check and as-built measurement delivered inside the fixed window when a Central West concentrator, mill or kiln is taken offline for a reline or overhaul. With Cadia, Northparkes and Tomingley running planned shutdowns where every hour offline costs $50,000–200,000 in lost gold and copper production, Industrial Spatial Solutions plans the work to the hour, executes to sub-millimetre tolerances, and keeps survey off the critical path so the plant restarts on time.

Key takeaways

• A shutdown survey in the Central West is an outage survey scoped to a specific maintenance window — a SAG or ball mill reline, a girth-gear and pinion realignment, a crusher rebuild or a kiln/cooler change-out — at operations such as Newmont's Cadia, CMOC's Northparkes and Alkane's Tomingley.
• ISS achieves ±0.3–1.0 mm alignment accuracy, ±0.02–0.05 mm coupling coaxiality with a FARO laser tracker, and 2–6 mm at 50 m laser-scan accuracy, all calibrated to ISO 17025 and reported on the spot so the next mechanical activity is never held up.
• The work splits into pre-outage baseline capture, in-outage alignment and fit-check, and post-outage as-built verification before the concentrator is recommissioned.
• The Central West's spread across Orange, Parkes, Dubbo and Cobar means shutdown survey support is a logistics problem as much as a technical one — control must be established and crews mobilised before the area is congested.
• Cost drivers are attendance pattern (standby versus scheduled shift), 24-hour shift loading, scanning scope and mobilisation distance — set against lost gold-copper production, the survey program is recovered the moment it prevents a single re-lift or schedule slip.

Shutdown surveys in the Central West gold and copper belt

Central West NSW is the state's gold and copper engine, and every major operation in it runs a processing plant that earns nothing while it is shut. Newmont's Cadia Valley Operations south-west of Orange feeds one of Australia's largest concentrators; CMOC's Northparkes near Parkes runs a modern copper-gold mill; Alkane's Tomingley operation south-west of Dubbo feeds a central processing plant; and the manufacturing and minerals-processing precincts at Orange and Parkes add fixed-plant maintenance to the regional load. When any of these lines comes down for a planned shutdown, the maintenance team has a fixed window to strip worn equipment, rebuild it and put everything back within tolerance — and they need independent measurement to prove each step before the next one begins.

That is what a shutdown survey delivers. The defining constraint is not accuracy in the abstract; it is the window. A SAG mill reline at a Central West concentrator might allow seventy-two hours of total downtime, and the girth-gear and pinion realignment that has to happen inside it cannot wait for control to be set out or for line of sight to clear. ISS chooses methodology, crew size, instrument selection and reporting cadence to fit the schedule rather than the other way round — a method that is "more accurate" but two hours slower can cost more than it saves when a generating unit or a copper circuit is losing six figures an hour.

This page covers how ISS delivers shutdown survey work specifically in the Central West: the operations and equipment it applies to, the field method, the accuracy and standards, and the regional logistics that make the difference between a survey program that protects a Central West outage and one that quietly extends it. It complements our broader Central West surveying coverage and our outage survey service detail.

Key point: A shutdown survey is not a routine alignment job that happens to fall during a maintenance window. 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 the Central West, where the nearest backup crew may be a day's drive away, that gamble is more expensive than anywhere else in NSW.

Where outage surveys apply in the Central West

The shutdown survey workload here is dominated by mineral processing, with rotating and fixed plant that comes offline on annual minor and multi-year major cycles.

The recurring jobs are the same ones that decide whether a concentrator restarts on schedule:

• SAG and ball mill reline alignment — the mill alignment window inside a reline is short and unforgiving. Girth-gear and pinion alignment, trunnion and bearing elevation, and foundation flatness are held to better than 0.1 mm on coupling and gear faces, because vibration from a misaligned drive destroys bearings and erodes throughput from the first hour of restart.
• Crusher rebuilds — primary and secondary crushers require precise levelling and drive-train alignment after a liner or eccentric change, verified before the unit is signalled fit to run.
• Conveyor and transfer-point work — overland and in-plant conveyors are realigned and pulley-positioned during shutdowns to control belt drift and spillage that otherwise bleeds availability.
• Kiln, cooler and dryer change-outs — where present, tyre and roller position and shell alignment are survey-dependent, and a pre-outage fit-check scan confirms a replacement section will land before the crane is holding it.
• Comprehensive as-built scanning — the shutdown is often the only time a plant is cold and open. Scanning equipment that is not being worked on builds the as-built record that becomes the design basis for the next overhaul, every clash check and every retrofit.

Method and equipment for a Central West outage

ISS runs Central West shutdown surveys to a five-phase protocol, compressed or expanded to the window but always in the same sequence: scope definition and methodology four to six weeks out, control-network establishment one to two weeks before, pre-outage baseline capture, in-outage execution, and post-outage verification before recommissioning. Establishing a stable 3D control network around the work area before it fills with scaffolding, cranes and demolition is the single biggest time-saver during the outage itself.

Equipment is selected to the task and the schedule, not by default:

• Leica MS60 MultiStation and TS16 robotic total station — the workhorses for control, mill and crusher alignment, and setout. The MS60 combines angle, distance and scanning in one instrument, which matters when setup time is the constraint. Automatic Target Recognition allows remote operation, keeping the surveyor clear of exclusion zones around active mill-liner lifts.
• Leica RTC360 3D laser scanner — dense point clouds at 2–6 mm at 50 m, full setup under two minutes. This is the fastest route to fit-check of a replacement module and to comprehensive as-built capture of a Central West concentrator — internals, pipework and clearance envelopes recorded in hours, not days.
• FARO laser tracker — for the tightest work, such as large drive-train couplings and machined seating faces, delivering ±0.015–0.025 mm at working range where a total station's accuracy is insufficient.
• Reflectorless and portable control targets — reach hot or inaccessible points without target placement and serve repeated measurement cycles across a multi-day shutdown with minimal setup and teardown.

Scanning and total-station work are complementary on an outage: the scanner captures the whole condition for as-built and fit-check, while the total station and tracker deliver the sub-millimetre alignment numbers the mechanical team signs against. Critical results — anything a lift or a coupling decision depends on — are reported verbally and in writing on the spot. The formal report never holds up the restart.

Accuracy and standards

Shutdown survey accuracy is matched to the engineering tolerance of the task, then verified against the relevant Australian Standard. Deliverables are provided in your mine grid or GDA2020, consistent with the Surveying and Spatial Information Act 2002 (NSW).

All instruments are calibrated to ISO 17025 and traceable to national standards, with measurement-uncertainty statements supplied alongside alignment deliverables. Structural and crane geometry is assessed against AS 4100 for steel structures and AS 1418.18 for crane runways, or against OEM tolerances where those are tighter. Where the shutdown intersects mine-safety obligations, the work sits inside the framework administered by the NSW Resources Regulator under the Work Health and Safety (Mines and Petroleum Sites) Act 2013 and Regulation 2022, and ISS field staff work to OEM-independent methodology so equipment from any manufacturer is aligned and verified consistently.

Why ISS for shutdown surveys in the Central West

ISS treats the outage window as the project constraint and engineers the survey around it: scope locked four to six weeks out, control established before the area is congested, and attendance scheduled against the work list so measurement is ready the moment an area is — never before, never after. Our surveyors hold current confined-space, working-at-heights and site-specific certifications for mining and processing environments, maintain inductions for major Central West operations, and carry redundant instrumentation so a single equipment fault never stops the line.

The Central West difference is logistics. ISS services the region from its Wollongong base with project-based mobilisation to Orange, Parkes, Dubbo and Cobar, and FIFO or drive-in arrangements for the more remote operations. For Orange and Parkes plants we can mobilise quickly; for Cobar and outlying sites we build travel, charter and camp accommodation into the schedule so survey support never becomes the bottleneck. Because the binding constraint in NSW resources is the availability of genuine industrial specialists rather than distance, we have deliberately kept our focus on mining and heavy industry — Central West operators get surveyors who understand girth-gear alignment, mill relines and concentrator as-built capture, not generalists learning on your shutdown. Deliverables come in Surpac, Vulcan, Deswik, 12d Model, AutoCAD or Civil 3D, in your mine grid or GDA2020, structured to drop straight into your engineering and recommissioning workflows.

Frequently asked questions

How quickly can ISS mobilise for a shutdown survey in the Central West?

For planned shutdowns at Orange and Parkes operations such as Cadia and Northparkes, we lock scope four to six weeks out and mobilise to suit the window. For genuine emergencies — a shutdown overrun or an unexpected reline fit problem — we move faster, and for Cobar and remote sites we schedule travel and accommodation in advance so a remote location never delays the restart.

What accuracy do you achieve on a Central West mill reline?

Mill and rotating-equipment alignment is held to ±0.3–1.0 mm, girth-gear, pinion and coupling coaxiality to ±0.02–0.05 mm with a FARO laser tracker, and as-built scanning to 2–6 mm at 50 m. All instruments are ISO 17025 calibrated and uncertainty statements accompany alignment deliverables, assessed against AS 4100, AS 1418.18 or tighter OEM tolerances as applicable.

Will the survey extend our outage window?

No — that is the entire point of a planned shutdown survey. Well-planned survey work 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 planning eliminates.

Do you scan the whole plant or only the equipment being worked on?

Either, and we usually recommend more than the work scope. The shutdown is often the only time a Central West concentrator is cold and open, so comprehensive laser scanning of surrounding equipment builds an as-built record that becomes the design basis for your next overhaul, every clash check and every retrofit — captured in hours while access exists.

Request a quote

If you have a mill reline, crusher rebuild or processing shutdown coming up anywhere in the Central West — Cadia, Northparkes, Tomingley, Cobar or the Orange and Parkes precincts — talk to ISS early so the survey is planned into your window rather than discovered in it.

1. Call 0407 057 015 — discuss your shutdown with a surveyor who understands Central West gold and copper processing plant.
2. Receive a fixed-price proposal — we scope methodology, schedule, safety requirements and deliverables for your specific outage.
3. Mobilise to the window — we coordinate inductions, travel, accommodation and redundant equipment to meet your restart date.

Outage windows do not wait. Call ISS on 0407 057 015 to scope your shutdown survey in the Central West and request a fixed-price quote.