SLOPE STABILITY MONITORING
Quellaveco ’ s geotech monitoring set-up
At the new Quellaveco copper mine in Peru , a modern geotechnical monitoring system for slopes and material deposits has been implemented by Anglo American , which uses four radars , analysis of satellite images , and a robotic station that monitors nearly 200 geolocation devices ( prisms ) in the field . Thanks to this technology , potential instability in different structures can be identified and thus manage the risks of collapse , providing greater safety to workers and mine equipment . The radar technologies include the GroundProbe SSR-XT and IBIS-ArcSAR from IDS GeoRadar .
When slopes move at a speed greater than safe limits , there is a risk of collapse . The radars scan the slopes every two minutes and send images to the geotechnical control centre , where the information on the changes and displacement of the surfaces is analysed . These data allow predictive decisions to be made by applying mathematical models . “ The geotechnical monitoring system gives us predictability about the stability of the slopes . In other words , we can know several hours in advance if a slope could collapse , which allows us to implement safety controls such as the installation of barriers or the evacuation of the area , if applicable ,” says Yhadin Collao Izaguirre , a Geotechnical Engineer at Anglo American . At the Quellaveco geotechnical control centre there is a “ sentry ” 24 hours a day , monitoring the information transmitted by the radars . In case of noticing a risk of collapse , its function is to issue an alert so that the area can be evacuated . This information is shared in real time with all the workers and equipment that are in the area .
The geotechnical monitoring system also uses satellite images to monitor the stability of slopes , material deposits , roads , among other surfaces , covering different areas of Quellaveco such as the Vizcachas dam in high mountains , the mining area , the processing plant and the tailings dam . The satellites record information every six days and with it the behaviour of its different components is analysed .
Traditionally , for this monitoring , a system of prisms was used , which are devices that emit coordinates and that when moving can give data on the displacement of slopes . In the mine , about 200 prisms , installed on the mine slopes and material deposits , are monitored by a robotic station , which autonomously collects information and sends it to the control centre . In this way , Anglo says that Quellaveco uses the most modern technology to ensure responsible and safe mining . velocity sensitivity range , likewise satellite InSAR , Guardian SMV performs a continuous monitoring of low vegetated environments for the most reliable data visualisation .
Hi-Sense , introduced in February this year , is Guardian ’ s new processing algorithm for an advanced atmospherics management in slope monitoring . Hi-Sense provides the cleanest view on displacements , even in challenging weather conditions : effects introduced by fast-changing
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atmospherics – such as , humidity , temperature , pressure – are processed ‘ with unparalleled fidelity ,’ facilitating the interpretation of data . Thanks to Hi-Sense ’ s extended sensitivity to a wider range of movement trends , quality data improves and false positives are reduced .
Pioneering the introduction of Artificial Intelligence in slope stability monitoring , Ai . DA is an AI-based software monitoring tool for
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intelligent support to radar data interpretation . Ai . DA simplifies the identification of movements from possible residual noise providing an additional layer of data analysis to processed Guardian data that allows the timely detection of spot deformation trends on wide monitored areas and shows the moving areas on a clear 3D map .
Finally , for an improved risk mitigation and planning , new multiple statistical tools have been released for RockSpot , IDS ’ radar system that is able to locate , track and notify on rockfalls . These statistical tools allow users to manipulate the events database and
plot custom-charts for a comprehensive back analysis , models calibration , integrity of rockfall controls and design change justification to reduce operational and geotechnical risks related to rockfalls .
Reutech Mining ' s comprehensive approach
Reutech Mining says it offers a comprehensive approach to geotechnical monitoring , surpassing the traditional reliance on individual sensors . It told IM : “ Our integrated solution ensures the delivery of accurate data , minimises downtime , and enhances overall safety .”
Its Movement and Surveying range comprises two radar sensors , the MSR Modular and the MSR Esprit . Both sensors provide fully georeferenced data and possess distinct capabilities essential for effective monitoring programs . These capabilities include long-range monitoring ; short-range monitoring ; challenging atmospherics ; fast-moving slopes ; wide area monitoring ; and integration of georeferenced data with other sensors .
“ Moreover , these sensors can be customised to accommodate specific mounting options based on site requirements . Additionally , their high mobility facilitates easy transportation , ensuring adaptability in various monitoring scenarios . To further enhance their versatility , weather kits are available for operations in extremely low-temperature environments .”
One of the key aspects of Reutech Mining ’ s approach is the capability to monitor slopes under diverse atmospheric conditions . Leveraging advanced in-house radar technology and integrated sensors , its solution mitigates downtime caused by phase wrapping and ensures uninterrupted monitoring . This seamless integration eliminates gaps in data , resulting in a robust and reliable slope stability monitoring system .
Reutech Mining also says its holistic solution
26 International Mining | AUGUST 2023