Outage Surveys — Broken Hill

TL;DR: An outage survey is precision alignment, fit-check and as-built measurement delivered inside the fixed window when Broken Hill's central Perilya concentrator — or an associated thermal or processing unit — is taken offline for maintenance. In a single-concentrator field more than 1,000 km from the coast, every overrun hour costs lost concentrate and the parts, crew and surveyor are all far away, so a shutdown survey in Broken Hill has to be scoped to the hour, captured in one mobilisation and kept off the critical path. Industrial Spatial Solutions delivers outage surveys to far west NSW operators on a scoped, single-trip basis.

Key takeaways

• Broken Hill runs on one central Perilya concentrator fed by underground silver-lead-zinc operations, so a concentrator shutdown is a whole-site event — an outage survey here protects total throughput, not one circuit among many.
• ISS achieves ±0.3–1.0 mm alignment, ±0.02–0.05 mm coaxiality with a laser tracker, and 2–6 mm at 50 m laser-scan accuracy using Leica MS60, TS16, RTC360 and FARO instruments, all calibrated to ISO/IEC 17025.
• At roughly 1,150 km from Sydney and 510 km from Adelaide, the binding constraint is completeness on the first visit — the work splits into pre-outage baseline, in-outage alignment and fit-check, and post-outage as-built verification, all scoped before mobilising.
• A mid-sized processing unit loses $50,000–150,000+ per hour offline; at a remote one-concentrator site that figure is inflated by distance, so a single prevented re-lift or schedule slip recovers the entire survey program.
• Work is governed by the NSW Work Health and Safety (Mines and Petroleum Sites) Regulation 2022, with survey data referenced to GDA2020 and AHD and crews carrying current Broken Hill site inductions.

Table of contents

• Outage surveys in a single-concentrator mining city
• Where outage survey work happens around Broken Hill
• Why outages are unforgiving in the far west
• Method, sequence and equipment
• Accuracy, standards and compliance
• Why ISS for outage surveys in Broken Hill
• Frequently asked questions
• Request a quote

Outage surveys in a single-concentrator mining city

Broken Hill grew out of a single geological feature — the Line of Lode, the 7 km arc of silver-lead-zinc mineralisation that Charles Rasp pegged in 1883 and that floated the Broken Hill Proprietary Company two years later. It is the longest continuously mined orebody in Australia, having yielded more than 200 million tonnes of ore (Geoscience Australia), and the city of roughly 17,000 people is stranded in the arid far west, tied to Adelaide by rail more closely than to Sydney. Modern production runs through Perilya's Southern Operations and Potosi/North mine into one central concentrator, with CBH Resources working the Rasp Mine beneath the city itself.

That single-concentrator structure is precisely why a shutdown survey in Broken Hill carries weight out of proportion to the equipment being worked on. When the eastern-seaboard plants run a unit outage, load shifts to a parallel circuit and the site keeps producing. Here there is no parallel circuit. When the crushing, milling and flotation line stops for a planned shutdown, the whole operation stops earning, and the maintenance team has a fixed window to remove worn components, rebuild or replace equipment, and put everything back within tolerance before restart. An outage survey is the independent measurement that proves each step is correct before the next one starts — and that proves it fast enough never to hold the window.

The defining feature of outage survey work, as opposed to a routine alignment job that happens to fall during a shutdown, is the window itself. Methodology, crew size, instrument selection and reporting cadence are all chosen 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 an idle concentrator is burning six figures a day. ISS establishes a stable measurement reference that survives the entire outage, then measures equipment positions against it at each stage — before disassembly, during rebuild, and after completion — so as-found can be compared against as-left and verified geometry feeds straight into recommissioning sign-off.

Key point: In Broken Hill the binding constraint is completeness on the first mobilisation. Every alignment reference, fit-check, scan position and control point has to be captured in one scoped visit — there is no economical second trip to pick up data discovered missing after demobilisation.

Where outage survey work happens around Broken Hill

Broken Hill is a base-metals field rather than a power or refining centre, so the outages here are concentrator shutdowns and processing-unit turnarounds rather than the generating-unit outages you find in the Hunter or Latrobe valleys. The discipline is identical; the context is mineral processing, a centralised circuit and remote logistics.

Typical outage survey applications in the region

Across all of these the survey demand follows the same arc: a pre-outage baseline while the plant is still running or immediately after stop, in-outage measurement sequenced with the mechanical work, and a post-outage as-built pass before recommissioning. Because the processing chain is centralised, alignment and fit-check work carry outsized importance — a misaligned mill or a transfer point left out of geometry after a Broken Hill shutdown does not degrade one circuit, it throttles the entire site's concentrate output until the next window.

Why outages are unforgiving in the far west

The financial logic of any outage is unforgiving, but the numbers bite harder in Broken Hill. A mid-sized processing unit or concentrator circuit loses $50,000–150,000 and more for every hour it stays offline, and at a remote single-concentrator operation every one of those costs is inflated — by the distance that delays parts and crews, and by the absence of a parallel circuit to carry production while you repair. A 10-day mill reline that slips three days because survey scope was discovered on the run can cost the operator close to half a million dollars in extended downtime before any rework. The outage survey is one of the few activities on a shutdown that can either protect that window or quietly blow it, depending entirely on how it is planned.

The most common cause of survey-driven overrun is not measurement error — it is scope discovered too late. Treating the surveyor as a day-of call-out rather than a scheduled resource almost guarantees lost hours waiting for control, access or line of sight, and in Broken Hill those lost hours are the most expensive in the country to recover. The other reason the window matters is that it is often the only time the asset is accessible: a mill shell, a trunnion bearing, a kiln tyre seat or the internals of a thickener can only be measured when the unit is cold and open. Comprehensive laser scanning during the outage — even of equipment not being worked on — builds an as-built record that supports every future modification, clash check and overhaul. The scan captured in this outage is the design basis for the next one.

The environment then makes the measurement itself harder. Broken Hill sits in a hot, arid, dust-laden climate where summer surface temperatures routinely exceed 40°C and red dust gets into everything. Heat haze degrades long-sight total station observations during the day; airborne dust affects laser scanner and tracker returns. Methods and timing have to be chosen for the conditions — early-morning observation windows, instrument acclimatisation, and cleaning regimes that eastern-seaboard crews rarely think about. None of that can be allowed to add hours to the window, which is why conditions-aware planning is part of the scope, not an afterthought.

Watch out: A survey error discovered mid-shutdown in Broken Hill is brutal. The replacement part, the specialist crew and the surveyor are all 1,000 km away, and the cost of waiting compounds with every idle hour on a circuit that the whole site depends on.

Method, sequence and equipment

ISS runs outage surveys to a five-phase protocol refined across power, refining and mineral-processing turnarounds. The phases compress or expand with the window, but the sequence holds, and for Broken Hill it is engineered around a single complete mobilisation.

1. Scope and methodology (4–6 weeks out). ISS reviews the outage work list, isolates every survey-dependent activity, and maps a measurement methodology against the shutdown schedule. For a remote site this stage is decisive: a pre-outage planning pass confirms access, hazards, control requirements and line of sight so nothing is discovered as missing once the crew is on site and the clock is running.

2. Control establishment (1–2 weeks out, or hour zero). A stable 3D control network is set around the work area with a Leica TS16 or MS60 MultiStation, using monumented or semi-permanent reference points positioned to survive scaffolding, crane movements and demolition. Establishing control before the area is congested is the single biggest time-saver during the outage — and a network ISS leaves in place can be reoccupied next shutdown, so each survey builds a trend.

3. Pre-outage baseline. As-found geometry is captured while the plant is still running or immediately after stop: mill and rotating-equipment centrelines, tyre and roller positions, bearing elevations, removal clearances and structural references for reassembly. This baseline is the reference against which all post-work measurement is judged.

4. In-outage execution. The core of the shutdown survey, measured in sequence with mechanical activity — dimensional verification after removal, alignment setting during rebuild, fit-check and clearance survey before installation, and level/flatness on cleaned foundations. Reflectorless and tracker measurement keep technicians clear of live lifting, and results are reported on the spot so the next activity is never held up.

5. Post-outage verification. A final pass confirms every adjusted component is in tolerance and captures the as-built condition. A short-form recommissioning compliance summary is issued before restart; the full report follows within 5–10 business days.

The instrument is chosen to the task and the schedule, not by default. The Leica MS60 MultiStation and TS16 robotic total station (±1 mm + 1.5 ppm, 1" angle) handle control, alignment and setout, with Automatic Target Recognition allowing remote operation clear of exclusion zones. The Leica RTC360 laser scanner captures dense as-built point clouds at 2–6 mm at 50 m with a setup under two minutes — the fastest route to fit-check of replacement modules and comprehensive as-built capture. A FARO laser tracker delivers ±0.015–0.025 mm for the tightest work: girth-gear and pinion meshing, large bearing bores, coupling coaxiality and machined seating faces where a total station's accuracy is insufficient. Trackers with active thermal compensation are essential in 40°C plant; cheaper instruments drift and produce misleading numbers.

Key point: Scanning and total-station work are complementary on an outage. The scanner captures the whole condition for as-built and fit-check; the total station and tracker deliver the sub-millimetre alignment numbers the mechanical team signs against. Using one where the other belongs either wastes window time or undershoots the tolerance.

Accuracy, standards and compliance

Outage survey accuracy is matched to the engineering tolerance of each task, then verified against the relevant standard. The table below summarises typical ISS specifications for Broken Hill work.

All instruments are calibrated to ISO/IEC 17025 and traceable to national measurement standards, and ISS supplies a measurement uncertainty statement with every alignment deliverable so the confidence interval on each value is explicit. Where the work touches structural or crane geometry, results are assessed against the relevant Australian Standard — AS 1418.18 for crane runways, AS 4100 for steel structures, and project or OEM tolerances where they are tighter than the code.

Mining and processing at Broken Hill operate under the NSW Work Health and Safety (Mines and Petroleum Sites) Act 2013 and Regulation 2022, administered by the NSW Resources Regulator, which requires monitoring of plant and structures where there is a credible risk of failure — an obligation that survey-based geometry and deformation work supports directly. Survey deliverables are referenced to GDA2020 and AHD in line with the Surveying and Spatial Information Act 2002 (NSW), and ISS field staff hold current generic and site-specific mine inductions for Broken Hill underground and processing operations.

Key point: ISS deliverables carry explicit uncertainty statements and ISO/IEC 17025 calibration, so the as-found and as-left geometry from your outage is defensible in your reliability, engineering and compliance workflows without rework.

Why ISS for outage surveys in Broken Hill

Industrial Spatial Solutions treats the outage window as the project constraint and engineers the survey around it. We are independent of any OEM, so we align and verify equipment from any manufacturer using one consistent, traceable methodology — and the whole ISS model for the far west is built around making each mobilisation count.

• Scoped, complete mobilisations. We lock scope 4–6 weeks out — every alignment reference, fit-check, scan position, control point and deliverable — so the data is captured in one visit rather than discovered as missing after demobilisation.
• Off the critical path. We 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. Critical results are reported verbally and in writing on the spot, so the formal report never holds up restart.
• Shutdown shift cover. We work day and night shifts to compress survey time inside the window, with redundant instrumentation so a single equipment failure never stops the line at a site where a replacement is 1,000 km away.
• Conditions-aware method. We plan observation windows for the cooler parts of the day, acclimatise and clean instruments against red-dust ingress, and choose scanner, total station or tracker to suit each task and the season.
• A trend, not a snapshot. We maintain the reference network between shutdowns so each Broken Hill outage compares against the last, making progressive movement visible and repeat surveys far more valuable than one-off measurements.

A typical outage survey package includes a pre-outage baseline report, in-outage alignment reports with deviation tables issued as each activity completes, fit-check and clearance confirmations, as-built survey plans, registered laser-scan data (E57, RCP or native), a recommissioning compliance summary before restart, and the consolidated full report within 5–10 business days. For operators running recurring programmes, ISS offers service agreements that bundle outage survey work with other Broken Hill mechanical tasks into planned visits that share travel cost across the scope.

Frequently asked questions

How is an outage survey different from the kiln alignment or mill alignment you offer?

They are the same disciplines delivered under a different constraint. A standalone mill or kiln alignment can be scheduled at convenience; an outage survey is that alignment — plus fit-check, dimensional control and as-built capture — sequenced inside a fixed, time-bound shutdown where the asset earns nothing until it restarts. In Broken Hill most alignment and dimensional work happens during a concentrator shutdown, so it is, in practice, outage survey work. The measurement is identical; the schedule, safety regime and reporting cadence are built around the window.

Can an outage survey be done without extending the Broken Hill window?

Yes, and that is the entire point. Well-planned shutdown 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. The risk that is unique to Broken Hill is the lost trip: scope must be complete before mobilising, because there is no cheap second visit to capture what was missed.

What accuracy can ISS achieve during a Broken Hill outage?

Alignment work is typically ±0.3–1.0 mm with total station and MultiStation, and ±0.02–0.05 mm for coaxiality and concentricity using a laser tracker. As-built scanning is 2–6 mm at 50 m. All instruments are ISO/IEC 17025 calibrated, referenced to GDA2020/AHD, and uncertainty statements accompany every alignment deliverable.

When should we book an outage survey, given the distance to Broken Hill?

Four to six weeks before the shutdown date. That allows full scope definition, a pre-outage planning pass, safety documentation and crew scheduling — and, critically for the far west, it lets us plan one efficient mobilisation rather than a rushed, partial one. Late bookings risk unavailable crews, rushed methodology and lost window hours that are the most expensive in the country to recover.

Request a quote

If you have a concentrator shutdown, mill reline, processing turnaround or component change-out coming up at a Broken Hill operation — at the Perilya concentrator, the Rasp Mine plant or an associated process — talk to ISS early. The difference between a survey program that protects your shutdown and one that derails it is planning, credentials and the right instrument for each task, and at a remote single-concentrator site that difference is measured in days of lost concentrate.

1. Call 0407 057 015 — Speak with a surveyor who understands concentrator shutdowns, mechanical alignment and remote far-west logistics.
2. Receive a scoped proposal — We define methodology, accuracy specification, schedule, shift cover, safety and deliverables for your Broken Hill outage.
3. Mobilise once — We coordinate inductions, travel and equipment to hit your shutdown window in a single efficient visit, with critical results reported on the spot.

For the full technical detail of the service, see outage survey services; for the wider picture of survey support in the city, see surveyors Broken Hill. Contact Industrial Spatial Solutions to request an outage survey quote for Broken Hill.