Longwall Mining-Induced Settlement Monitored Over a Large Area with InSAR
Picton - NewSouth Wales, Australia
Highlights
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Longwall mining-induced settlement over a large area needed to be determined.
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InSAR analysis (SBAS) was performed on a time series of satellite images.
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The extent and magnitude of subsidence and uplift were determined for a nearby industrial zone, road, and railway line.
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The pattern of movement coincided with the mining operations beneath.
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We validated against in situ monitoring by different contractor.
A mining operation in New South Wales, Australia, needed to ensure that its activities were not negatively impacting the surrounding areas, particularly the safety of the town of Picton. Accurate subsidence data was essential for operators to continue mining efficiently while ensuring minimal disruption and maintaining the safety of the town above.
Monitoring Extensive Mining Subsidence
Mining operations can cause significant subsidence, or ground settlement, which requires precise monitoring to prevent structural damage and ensure public safety. However, conducting regular in-situ surveys over large areas in all weather conditions can be challenging and time-consuming. The mine required a more efficient, cost-effective way to monitor surface displacements.
InSAR analysis provided complete coverage of the area of interest, even in difficult to reach locations. Data was collected with more precision than in-situ surveys, allowing for the subtle detection of ground movement with millimetric accuracy. The analysis flagged areas vulnerable to subsidence in the surrounding town, informing the operators to pivot the direction of their excavation to avoid damage. Thanks to the accurate monitoring, mining operations continue without incident, and the town of Picton remained unaffected by ground movements.
InSAR Data Analysis for Millimetric Accuracy
To address the challenge, Interferometric Synthetic Aperture Radar (InSAR) analysis was performed on a series of satellite images over the duration of the mining operations. This allowed for the detection of ground surface displacements with millimetric accuracy. By utilising historical and current satellite data, the full extent and magnitude of mining-induced subsidence were determined, providing insights into how the land surface responded to the underground activity.
Safe Mining and Precise Monitoring
Ensuring Mining Safety with Satellite Monitoring
InSAR technology provided the mining operators with a highly efficient, non-invasive way to monitor subsidence and ensure that operations were carried out safely. By identifying areas of concern early, the mine was able to mitigate risks, protect the community, and maintain continuous operations.
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For more information on how Geofem can assist with subsidence monitoring using InSAR data, contact us today.
