SLOPES. SUBSIDENCE. GROUND CONTROL.
Mining Geotechnical Monitoring Intelligence
GeoSmar interprets slope, subsidence, groundwater and ground-control monitoring data for open-pit and underground mines, supporting independent review, diagnostics, InSAR and engineering decisions worldwide.
Mining Monitoring Intelligence
Mining monitoring should explain ground behaviour, not just display movement.
Open pits, underground workings, waste landforms and mine infrastructure can behave very differently because the controlling geology, excavation geometry, groundwater, stress state and mining sequence are different. A useful monitoring programme therefore starts with the failure mechanism and the decision that must be made—not with a preferred sensor.
Official context: WorkSafe Western Australia — Geotechnical considerations in open pit mines; WorkSafe Western Australia — Geotechnical considerations in underground mines.
Ground Context
The geology sets the monitoring problem.
A mine monitoring plan should reflect the expected mode and scale of instability. The same displacement rate can mean different things in a stiff rock slope, a weathered weak zone, a structurally controlled wedge or an underground opening under high stress.
Structure, weathering and water
Faults, joints, bedding, weak seams, altered or weathered zones and groundwater can control the geometry and rate of pit-wall movement. Monitoring should be located where it can observe the expected failure mechanism and the areas exposed to its consequences.
Stress, openings and ground support
Roof, rib and face behaviour can be influenced by weak strata, discontinuities, horizontal stress, mining depth, pillar geometry and previous workings. Monitoring may need to follow convergence, displacement, load or seismic response as the mining sequence changes.
Pore pressure can change the mechanism
Water pressure, seepage and rainfall response can weaken materials or reduce effective stress. Where groundwater is part of the mechanism, piezometric information should be interpreted with deformation rather than reviewed as an isolated dataset.
Subsidence can extend beyond the excavation
Underground extraction, dewatering and large-scale ground disturbance can produce movement away from the immediate working area. Wide-area survey or satellite-derived ground-motion information can help identify patterns that warrant closer field investigation.
What GeoSmar would request before giving a mine-specific interpretation
Official context: NIOSH — Mining and Ground Falls; WorkSafe Western Australia — Ground control.
Monitoring Plan
Start with the failure mechanism, then design the monitoring chain.
Regulator guidance consistently treats monitoring as part of ground-control management. The plan should define what can move, what needs to be measured, how often data are reviewed, what constitutes abnormal behaviour and who must act.
Identify credible slope, subsidence, roof, rib, face or support failure modes and the areas exposed.
Match displacement, pore pressure, convergence, load, seismicity or surface movement to the mechanism.
Combine local, broad-area and subsurface measurements where one technology cannot cover the full risk.
Set review frequency, data-quality checks, mine-specific thresholds, verification and Trigger Action Response Plan responsibilities.
- Baseline period and reference stability
- Monitoring locations linked to geotechnical domains
- Measurement frequency appropriate to the hazard
- Redundancy for high-consequence areas
- Calibration, maintenance and data-health checks
- Communication failure and missing-data procedure
- Mine-specific alarm thresholds
- Named escalation and decision authority
Official sources: NIOSH Mine Slope and Subsidence Monitoring Partnership; NSW Resources Regulator — Health and safety at quarries, slope movement monitoring.
Instrumentation
Different instruments answer different questions.
The list below is a design discussion, not a prescription. Selection depends on failure geometry, required resolution, line of sight, access, power and communications, spatial coverage, response time, maintenance burden and the consequences of data loss.
| Monitoring method | Typical mining question | Strength | Key limitation to review |
|---|---|---|---|
| Ground-based slope radar | Is a pit wall or defined slope area accelerating? | High-frequency broad-area surface deformation monitoring. | Line of sight, radar geometry, coverage, communications and alarm management. |
| Robotic total station + prisms | How are selected points moving in 3D survey space? | Repeatable point monitoring and strong integration with mine survey control. | Prism survivability, reference stability, atmospheric effects and visibility. |
| GNSS | How are selected surface locations moving continuously? | Continuous coordinate-based monitoring without intervisibility between stations. | Sky view, multipath, monument stability and required precision. |
| Inclinometer / extensometer | Where is subsurface shear or internal deformation developing? | Provides information below the visible ground surface. | Installation geometry, depth coverage, survivability and access for reading/maintenance. |
| Piezometer / groundwater monitoring | Is changing water pressure contributing to instability? | Connects deformation review with hydrogeological response. | Sensor elevation, installation response, drainage conditions and baseline interpretation. |
| LiDAR / photogrammetry / UAV survey | How is the geometry of a wall, bench, dump or surface changing? | Dense spatial information for geometry, change detection and mapping. | Survey interval, occlusion, surface texture, registration and weather/operational access. |
| Microseismic / convergence / load monitoring | How is underground ground or support responding to mining? | Can track dynamic response, closure or support behaviour. | Requires mine-specific interpretation of event location, mechanism, baseline and support context. |
| Satellite InSAR | Where is persistent surface movement occurring across a wide mine or portfolio? | Wide-area historical and ongoing ground-motion screening. | Line-of-sight sensitivity, revisit interval, coherence, vegetation, geometry and interpretation uncertainty. |
Official context: NIOSH Mine Slope and Subsidence Monitoring Partnership; Trimble Geospatial — mine monitoring and remediation. Supplier references describe available technology; they do not imply endorsement of GeoSmar.
Data Review
The monitoring system is only as reliable as its data chain.
A movement alarm is not the end of the analysis. The first technical question is whether the signal is complete, traceable and consistent with other evidence. GeoSmar’s role is to add an independent interpretation layer above the mine’s existing instruments, survey systems and monitoring contractors.
Data health
Review missing records, time gaps, step changes, reference shifts, instrument status, duplicate values, impossible rates and maintenance events before treating the trend as ground movement.
Multiple lines of evidence
Compare radar, prisms, GNSS, piezometers, subsurface instruments, visual observations, blasting and mining sequence where those datasets are available.
Magnitude + rate + mechanism
Consider displacement magnitude together with velocity, acceleration, spatial pattern, persistence and the expected geotechnical mechanism.
What if the radar, prism and InSAR trends do not agree?
What if a monitoring stream goes offline?
Open-Pit Mining
Pit-wall monitoring needs both broad coverage and mechanism-level detail.
A deep pit may contain many geotechnical domains and failure mechanisms at the same time. Broad-area systems can identify changing zones, while point and subsurface instruments help test the geometry and possible cause of movement.
Operational pit slopes
Review bench and inter-ramp movement, active mining exposure, ramps, infrastructure below slopes, blast effects and changes in rate. Monitoring density and review frequency should increase where consequences and uncertainty are higher.
Water-sensitive slopes
Where groundwater or rainfall contributes to the mechanism, deformation should be read together with pore-pressure, seepage and dewatering information. A movement trend without its hydrogeological context can be misleading.
Waste dumps and stockpiles
Large constructed landforms may require their own monitoring geometry, drainage review and trigger framework. Their movement mechanisms should not be assumed to be the same as intact rock pit slopes.
Access-limited areas
Remote sensing can reduce the need to place personnel or instruments directly in unstable ground. The monitoring plan still needs a defined response when the remote system loses visibility, communications or data continuity.
Official guidance: WorkSafe Western Australia — Geotechnical considerations in open pit mines; NIOSH — Mining and Ground Falls.
Underground Mining
Underground monitoring follows the excavation, stress and support system.
Underground ground-control questions are different from open-pit slope questions. The monitoring strategy may need to track local convergence, roof or rib displacement, support loads, seismic response, groundwater and larger-scale subsidence as the extraction sequence advances.
Convergence and deformation
Measure closure or deformation where changes in excavation geometry, rock mass condition or stress concentration could alter ground behaviour.
Loads and reinforcement
Where required by the ground-control strategy, support performance can be reviewed alongside deformation rather than treated as a separate maintenance record.
Microseismic and stress-related behaviour
Deep or highly stressed mines may use seismic and stress-related monitoring to help understand changing conditions. Interpretation must be specific to the mine’s geology and mining sequence.
Subsidence
Surface survey, GNSS or InSAR can complement underground observations where extraction may influence ground or assets above the mine.
Groundwater and inflow
Hydrogeological observations may be important where water affects ground stability, inflow risk or surface response.
Mining sequence matters
Baselines and trigger expectations may need to be revisited when depth, extraction geometry, neighbouring workings or support design materially changes.
Official guidance: WorkSafe Western Australia — Geotechnical considerations in underground mines; NIOSH — Ground control and ground falls research.
Contract & Operational Interfaces
The difficult part is often who acts, when, and on whose data.
A technically sound monitoring system can still fail operationally if the contract and response interfaces are vague. Mining scopes should define responsibility for data availability, interpretation, escalation and maintenance before abnormal movement occurs.
Trigger authority
Who sets and approves the trigger criteria? Who can change them after new geotechnical information becomes available? Who has authority to restrict or stop work?
Data ownership and access
Define access to raw data, metadata, calibration records, alarm histories and system-health information—not only exported PDF reports.
Availability and redundancy
Specify what happens when a radar, telemetry link, reference point, logger or power supply is unavailable, and whether an alternative verification method is required.
Escalation route
The contact chain between remote monitoring, site geotechnical staff, operations and management should be explicit, tested and available around the clock where the hazard requires it.
Maintenance and calibration
Responsibility for physical access, calibration, cleaning, reference verification, battery or power management and communication faults should be stated.
Independent review
For critical or disputed conditions, a separate technical review can examine whether the data, thresholds, interpretation and proposed response are supported by the available evidence.
Official source: NSW Resources Regulator — Health and safety at quarries.
Official Case Studies
Three public cases show why monitoring architecture matters.
These are not GeoSmar projects. They are public examples from official supplier or operator-facing sources and are included to discuss monitoring principles that can be checked against the original source.
InSAR added wide-area context to an instrumented pit
SkyGeo’s official Kansanshi case describes a geologically complex open pit involving dolomite, marble and schistose rock, with high water pressure and structural variation. The reported monitoring mix included visual inspections, ground-based radar, robotic total stations, prisms, piezometers and InSAR. The case links movement interpretation with depressurisation and horizontal drains.
Monitoring redundancy became critical after prisms were lost
GroundProbe’s Newmont Gold Quarry case describes a slope that had been monitored with automated prisms. When many prisms were lost within the slide mass, slope radar was used during remediation together with visual inspection, work-area procedures and alarms to dispatch and geotechnical staff. The case illustrates why a high-consequence monitoring plan should consider what happens when one measurement system becomes unavailable.
Specialist monitoring can be delivered as a dedicated service
GroundProbe’s Codelco Andina case describes an outsourced slope-monitoring service using two slope stability radars, around-the-clock monitoring, daily geotechnical reports and data analysis. It is a useful public precedent for separating the monitoring-interpretation function from day-to-day production activity.
GeoSmar Role
A technical layer between mine monitoring systems and engineering decisions.
GeoSmar is positioned around monitoring intelligence rather than mine-site installation manpower. A mine can retain its existing survey team, radar supplier, instrumentation contractor and geotechnical staff while GeoSmar supports independent review, data diagnostics, wide-area ground-motion interpretation and repeatable reporting.
Monitoring Intelligence
Recurring review of movement, groundwater, alerts and data quality, structured around engineering significance rather than dashboard volume.
Independent Monitoring Review
Independent assessment of monitoring plans, data completeness, trigger logic, abnormal trends and contractor or supplier interpretations.
InSAR Ground Motion
Satellite-derived ground-motion information interpreted in mining and geotechnical context, particularly where wide-area movement screening can complement field systems.
Monitoring Design & Strategy
Support for monitoring philosophy, sensor roles, locations, baseline requirements, review frequency, escalation logic and reporting requirements.
Data Diagnostics
Focused review of sudden movement, inconsistent instruments, baseline changes, missing data, conflicting trends and apparent trigger exceedances.
Reporting Workflow
Technology-enabled charting, threshold checks, completeness review and engineer-reviewed reporting without treating automation as the engineering conclusion.
FAQs
Questions to settle before a mining monitoring review starts.
Can GeoSmar monitor a mine without replacing the existing radar or instrumentation system?
Can one trigger value be used across different slopes or mines?
Is InSAR a replacement for slope radar or prisms?
What data are needed for an independent review?
Can GeoSmar provide 24/7 alarm response?
Does GeoSmar make the final decision to evacuate or stop mining?
Start a Technical Discussion
Have a mine monitoring dataset or ground-control question that needs an independent view?
Send a project brief, monitoring report, sample time series or a description of the movement you are trying to understand. GeoSmar can first define whether the question is best approached through independent review, data diagnostics, InSAR, monitoring strategy or a recurring monitoring-intelligence workflow.
For a useful first review, include the mine type, country, project stage, monitoring system currently in use, the issue you want reviewed, and whether raw time-series data are available.
Official References
Public sources used for this technical discussion.
GeoSmar has intentionally used regulator, government research and first-party supplier sources. The case studies below remain attributed to their original publishers and are not presented as GeoSmar project experience.
Government and regulator guidance
WorkSafe Western Australia — Geotechnical considerations in open pit mines
WorkSafe Western Australia — Geotechnical considerations in underground mines
WorkSafe Western Australia — Ground control
NSW Resources Regulator — Health and safety at quarries