Control Networks — Kalgoorlie

TL;DR: A survey control network in Kalgoorlie is the GDA2020-tied framework of marks every metre of Goldfields mining and processing work hangs from — from Super Pit bench pickup to SAG mill foundations at Fimiston and TSF raise monitoring at Mungari. Industrial Spatial Solutions designs, observes and adjusts control networks across the Eastern Goldfields to ICSM SP1 standards, from Third Order open-pit control to Zero Order deformation monitoring, with rigorous least-squares adjustment and mine-grid deliverables.

Key takeaways

• A survey control network in Kalgoorlie must survive the most aggressive ground in Australian mining: production blasting at the Super Pit, deep underground development at Kanowna Belle, and saline, expansive Goldfields soils that quietly heave concrete monuments out of position.
• ISS establishes control to ICSM SP1 orders — Third Order (±50 mm) for general pit and dump work, Second Order (±15 mm) for primary site control, First Order (±5 mm) for shaft and decline transfer, and Zero Order (±1 mm) for high-wall and tailings dam deformation monitoring.
• Goldfields operators including Northern Star Resources (Fimiston/Super Pit JV, Kanowna Belle, Kundana), Evolution Mining (Mungari) and Lynas Rare Earths (Kalgoorlie processing facility) all depend on consistent control to integrate multi-source ore tracking, statutory plans and equipment set-out.
• Control is roughly 5–10% of total survey cost — typically AUD $8,000–$40,000 to establish a Second Order site network — yet a failed or drifting network can invalidate months of pit reconciliation and mine-plan compliance, making it the highest-return survey activity on any Kalgoorlie site.
• All ISS deliverables are tied to GDA2020 and AHD (or your mine grid) and issued in Surpac, Vulcan, Deswik or AutoCAD, ready for direct use by mine survey and geology teams.

Kalgoorlie-Boulder has produced more than 60 million ounces of gold since Paddy Hannan's 1893 strike, and every ounce mined today is positioned, reconciled and reported against a chain of survey marks that begins with a control network. The Super Pit alone — roughly 3.5 km long, 1.5 km wide and over 600 m deep — cannot be surveyed at all without primary control on stable ground beyond the pit crest, densified down the ramps and re-established after each cutback. Get the control wrong and the consequences cascade: pit designs sit in the wrong place, ore is lost to dilution, statutory mine plans fail audit, and deformation baselines report movement that never happened.

This page covers how ISS designs, observes and maintains the survey control network Kalgoorlie gold and processing operations rely on — the accuracy classes, the field methods and instruments suited to a hot, dusty, blast-prone environment, the regulatory framework under WA mining law, and why control is the one survey deliverable no Goldfields operator can afford to treat as a commodity. It is a companion to our Kalgoorlie Goldfields mining survey hub and the broader control network surveys guide.

Control networks in the Goldfields environment

A control network is the spatial backbone of a site: a set of permanently marked points with known eastings, northings and elevations, measured in a redundant network configuration and adjusted by least squares so that every later measurement — set-out, pit pickup, stope survey, as-built, monitoring — connects to one consistent coordinate system across surveyors, shifts and years.

In the Eastern Goldfields, three local factors make that harder than the textbook describes:

• Blast vibration. Production blasting at open pits like the Super Pit and Mungari's satellite pits, and development firing underground, shakes monuments and shifts ground. Control points near active mining have a short life and must be designed for fast, reliable re-establishment from a protected primary network sited well outside the zone of influence.
• Reactive and saline ground. Goldfields soils are highly saline, with calcrete, clay and seasonal moisture swings that heave and settle shallow marks. Primary monuments need deep, founded monumentation — driven steel or concrete to competent material — not a star picket in surface clay.
• Heat, dust and remoteness. Surface temperatures regularly exceed 40 °C in summer, and rock temperatures underground at the deeper operations approach 50 °C. Atmospheric refraction over long pit traverses, instrument drift in heat, and dust on optics all degrade observations unless procedures explicitly account for them.

Key point: In Kalgoorlie the network design problem is not just where to put marks for visibility and accuracy — it is which marks will still be there, and unmoved, after the next blast and the next wet season. Primary control belongs on stable ground beyond the pit and tailings footprint, with redundancy built in so the loss of any single mark never stops production.

Local applications: pits, plants and TSFs

Every survey-dependent task across the Kalgoorlie region traces back to control. The table below maps the major operation types to the control they need.

Two applications dominate demand. The first is multi-source ore tracking: operations like Mungari feed a central mill from several pits and underground sources, and accurate ore reconciliation and blend control are impossible unless every source sits in one rigorously adjusted control framework. The second is deformation monitoring — Super Pit high walls and every TSF in the region require a separate, higher-order control datum founded on ground outside the zone of movement, against which prism, scanning and GNSS monitoring epochs are compared. A monitoring network that drifts reports false deformation (costly false alarms) or, worse, masks real movement (a safety and regulatory failure).

Method and equipment

ISS designs each network around the required accuracy class, the site geometry, and the Goldfields conditions above. A typical site network is built in five stages.

1. Reconnaissance and design. Review existing State Survey Marks and any legacy mine control, confirm datum (GDA2020/AHD or mine grid), and plan mark locations for stability, visibility and protection from mining. Set the target ICSM SP1 order per the project's tightest tolerance.
2. Monumentation. Primary marks are deep-founded concrete or driven-steel monuments with brass plaques on stable ground beyond the pit and TSF footprint; secondary marks densify the working area; tertiary marks serve daily set-out and are expected to be expendable.
3. Observation. Static and rapid-static GNSS for the primary braced network, observed in multiple sessions for redundancy; precise total station rounds for densification and where GNSS is blocked by pit walls or plant structures; digital levelling with bar-coded staves for vertical control. Surface-to-underground transfer uses gyro-theodolite traversing or co-planing/plumbing down shafts and declines.
4. Adjustment. Rigorous least-squares network adjustment, blunder detection, and a documented accuracy assessment confirming the network meets the specified order, with coordinates and uncertainties tied to the national framework where required.
5. Validation and handover. Independent check observations, a control network report, per-mark certificates, and delivery in your mining software format.

Representative kit: dual-frequency multi-constellation GNSS (GDA2020/AUSPOS-capable), 0.5″–1″ robotic total stations for monitoring and densification, digital levels achieving sub-millimetre loop closures, and laser scanning where high-wall or plant geometry is captured against the control datum. Equipment is selected and maintained for heat, dust and vibration, with backup instruments carried to remote sites so a single failure never strands a crew 600 km from Perth.

Standards and compliance

Control work in Kalgoorlie sits inside both the national survey framework and WA's mining regulatory regime:

• ICSM SP1 (Standards for the Australian Survey Control Network) defines the accuracy orders ISS works to — Zero Order (±1 mm relative) for deformation and precision alignment, First Order (±5 mm) for shaft and tunnel transfer, Second Order (±15 mm) for primary site and plant control, and Third Order (±50 mm) for general pit and earthworks survey.
• GDA2020 and AHD are the standard horizontal and vertical datums; networks are connected via State Survey Marks or AUSPOS where geodetic integration is needed, or held on a defined mine grid where the operator prefers a local system.
• Mines Safety and Inspection Act 1994 (WA) and the Work Health and Safety (Mines) Regulations 2022 (WA) require accurate, maintained mine survey plans and underpin the survey control behind statutory plans, void definition and ground-movement monitoring.
• TSF and dam safety monitoring is conducted against control referenced to ANCOLD guidance and operator dam-safety management plans — making the integrity of the monitoring control datum a direct safety-of-life concern.
• For the Lynas rare earths facility and similar processing plants, plant and structural set-out follows the relevant AS structural and engineering tolerances, all referenced to the site control network.

Key point: Specifying the right order matters as much as achieving it. Zero Order control on a general waste-dump survey wastes money; Third Order control under a SAG mill foundation or a TSF monitoring programme is dangerously inadequate. ISS recommends the order that matches each measurement's real tolerance — no more, no less.

Why ISS for control networks in Kalgoorlie

Western Australia's surveyor shortage is acute — the state carries the highest resources share of any economy (43.6%) and 151,000-plus resources jobs — so reliable, mining-literate control survey capacity is scarce in the Goldfields. ISS brings:

• Goldfields-specific design experience — networks built to survive blasting, reactive saline ground and 40 °C-plus heat, with redundancy that keeps production moving when marks are lost.
• Full accuracy range — from Third Order pit control to Zero Order high-wall and TSF deformation datums, all least-squares adjusted and documented to ICSM SP1.
• Kalgoorlie-coordinated mobilisation — projects run through Kalgoorlie to cut mobilisation time and cost across the region, with FIFO from Perth for larger scopes.
• Mine-ready deliverables — coordinates in GDA2020/AHD or your mine grid, in Surpac, Vulcan, Deswik or AutoCAD, ready for survey, geology and engineering teams without rework.

Frequently asked questions

How often does a Kalgoorlie mine control network need re-checking?

It depends on proximity to active mining. Primary control on stable ground beyond the pit and TSF footprint is typically re-observed quarterly; control near active blasting may need checking after each significant blast or cutback; and deformation monitoring control is re-observed on the schedule set in the monitoring plan, from weekly to annually. ISS recommends an interval per mark based on its exposure and the consequence of its movement.

Can you tie our network to GDA2020 or do you work in mine grid?

Both. We connect to GDA2020 and AHD through State Survey Marks or AUSPOS where geodetic integration is required, and we equally hold networks on an established mine grid where that is your operating standard. Deliverables are issued in whichever datum and coordinate system your survey and geology teams use.

What does a control network cost for a Kalgoorlie site?

As a guide, a small Third Order network runs roughly AUD $3,000–$8,000, a medium Second Order site network AUD $8,000–$20,000, and a large site or major-project network AUD $15,000–$40,000-plus. Shaft or decline transfer and Zero Order deformation networks are priced separately given their higher accuracy and observation demands. Remoteness, monumentation depth and required order are the main cost drivers.

Do you transfer control underground at operations like Kanowna Belle?

Yes. We transfer surface control into declines and shafts using gyro-theodolite traversing, plumbing and co-planing down shafts, and high-order traverse along declines, observed and adjusted to First Order to control error accumulation over long underground drives. This keeps underground development, stope pickup and statutory plans consistent with the surface network.

Request a quote

If you operate a gold mine, processing plant or TSF in the Kalgoorlie Goldfields and need a control network designed, established, re-observed or adjusted, talk to a surveyor who understands the ground here.

1. Call us on 0407 057 015 — discuss your accuracy requirements, site conditions and schedule.
2. Receive a scoped proposal — methodology, ICSM order, monumentation, deliverables and pricing specific to your operation.
3. Mobilise to site — coordinated through Kalgoorlie or FIFO from Perth, with inductions and equipment aligned to your timeline.

For operators running several Goldfields sites, ISS offers service agreements with preferential scheduling for control establishment and ongoing monitoring. Contact Industrial Spatial Solutions to put a solid spatial foundation under your Kalgoorlie operation.

Industrial Spatial Solutions — Goldfields control established, accuracy assured.

Related reading: Mining survey services in Kalgoorlie and the Goldfields, Control network surveys