Mt Carlton Gold Mine - Deformation Monitoring
Mt Carlton is located 150 km south of Townsville, Queensland. Operating a 500 metre by 400 metre pit and a 600 metre by 600 metre tailings dam, the company opted to introduce advanced deformation monitoring technology to deliver real-time status updates and alerts to its team.
Evolution opted for Senceive’s GeoWANTM solution, a long-range transmission system capable of covering areas up to 15 km. It incorporates several sensors placed along the tailings dam and/or pit walls to measure for minute movements in the surface. The sensors are wirelessly connected to a solar-powered gateway positioned near to the pit, which transfers live data is to web-based monitoring software.
Depending on the application, different sensors can be used in combination to deliver highly accurate geotechnical measurements, including tilt, pressure, vibration, temperature or optical displacement.
At Mt Carlton, Evolution installed more than 20 triaxial tilt sensors positioned around the tailings dam to detect movement. The team also monitor live data from piezometers that measure changes in moisture levels within the tailings dam walls. Numerous other sensors were installed in the open pit, to monitor pit wall, waste backfill and survey pillar movement.
Senior Mine Surveyor for Evolution, Callum McNaughton, said the solution has enabled his small team to provide accurate, viable monitoring data to the departments that need it. “The wireless monitoring platform has been perfect for us,” he said. “It dramatically reduces the need for us to manually survey these areas, saving us time and increasing safety by removing surveyors walking these areas on foot.” One of the key advantages, Mr McNaughton explains, is the ability to set different tolerances and time triggers for each sensor and/or area. “In the tailings dam we have a slightly higher tolerance before any alerts are triggered, because you do get some movement in the dam and swelling from rain,” he said.
“Inside the pit and in one area where there is a crack in the wall, the tolerance is much tighter and the sensors are triggered more frequently,” he added. “The sensors are also firing measurements every 10 minutes in the pit, whereas they monitor every half an hour on the tailings dam.”
The monitoring data is used by multiple teams at Evolution Mining, including surveyors, geotechnical engineers, pit supervisors and the control room. “We can configure who gets the alerts and the escalation process, so that different teams can receive different levels of alert if need be,” Mr McNaughton said.
In addition to alerts if movement outside of tolerance is detected, the team uses the monitoring information for various reporting requirements. Geotechnical and survey teams use the data in their monthly reports, and it also forms part of the company’s quarterly compliance report for the tailings dam.
“It’s great that the monitoring data is helpful to so many different stakeholders at Evolution,” Mr McNaughton said. “The geotechnical engineers can pull out any relevant information for their reports and dashboards, and the pit supervisors can instantly receive any alerts if there are changes detected by the system.”
Mr McNaughton said that the wireless monitoring system did not replace traditional survey methods, but instead complimented them with ongoing monitoring data that enables early intervention and proactive management of the pit and tailings dam.
Technical support and product training was provided by Senceive’s Australian based distributor, Position Partners. The Position Partners deformation monitoring team offers comprehensive advice, installation, onboarding and support throughout Australia, New Zealand and South East Asia.
“Having a local team was crucial for us to ensure that any technical issues could be actioned quickly,” Mr McNaughton said. “The Position Partners team has provided excellent communication and fast turnaround times whenever we have needed help. Initially we relied on the support team a lot as we learnt how to configure and use the technology, but once we had everything setup the way we wanted it was more a case of configuring our internal processes and escalation procedures if alerts are received,” he added.
The platform doesn’t take away from a mine surveyor’s work, it acts as a pre-warning system and enables us to track trends over time. In my opinion, the reliability, longevity and accuracy of the system we have in place at Mt Carlton would be hard to beat