Progression and management of seismic hazard through the life of Telfer sublevel cave

Woods, Matthew; Poulter, Mollie; King, R. P.

doi:10.36487/acg_rep/1815_48_king

Cited by 3 publications

(3 citation statements)

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“…As discussed in Woods et al (2018), there is a clear link between SLC production and cave growth activity and seismic activity rate. Therefore, seismic activity rate around the 4650 to 4620 Decline area was used as a proxy for rock mass damage and deformation in the decline.…”

Section: Production and Seismic Activity Ratementioning

confidence: 96%

A case study: managing decline deformation in an active sublevel caving operation

Woods¹,

Fitch²,

Doolan³

et al. 2019

Proceedings of the First International Conference on Mining Geomechanical Risk

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Telfer Gold Mine is located in the Great Sandy Desert and consists of both open pit and underground operations, including a mature sublevel cave (SLC). Changes to SLC design, with the addition of several sublevels, have resulted in an increased cave influence zone, with particular impact on the 4650 to 4600 Decline. This increased cave influence was identified during the planning stage risk assessment for the additional sublevels and a monitoring plan with associated trigger action response plans (TARPs) were included in the cave major hazard management plan (CMHMP). Once TARPs were triggered, ground support upgrades and a planned bypass were initiated for a section of the main decline. High underground temperatures and difficult work conditions resulted in the bypass activity being delayed until temperatures subsided. Due to the delays with bypass development and ongoing progression of deformation at a faster-than-expected rate, access through the original section of decline needed to be maintained for a greater length of time and with higher-than-expected deformation rates. Both a tactical ground support upgrade and a risk management plan based around monitoring data were used to maintain safe access through the main decline until the bypass was complete. Monitoring data showed a clear cause and effect between SLC production and deformation, allowing SLC production holds to be used as a key control.

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Section: Production and Seismic Activity Ratementioning

confidence: 96%

A case study: managing decline deformation in an active sublevel caving operation

Woods¹,

Fitch²,

Doolan³

et al. 2019

Proceedings of the First International Conference on Mining Geomechanical Risk

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“…In incline intrusion ore bodies, generally, drift access for the haulage shaft path is deployed on the footwall side by considering the stability and confidence level of the rock mass strength value. Generally, seismometer networks in underground mines are deployed in the facility area due to the ease of access regarding deployment and they can be used to monitor the stress distribution in the rock mass around the tunnel development [14]. During development activities and the preparations for mine production, the seismometers installed in the facility area remain relevant.…”

Section: Introductionmentioning

confidence: 99%

Testing the Utilization of a Seismic Network Outside the Main Mining Facility Area for Expanding the Microseismic Monitoring Coverage in a Deep Block Caving

et al. 2022

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In the case of mining in an inclined intrusion using the block caving method, the highest stress is usually concentrated in the seismogenic and abutment zones, especially in the front of the sloping area. In an inclined intrusion of more than 40°, the seismometer network is usually distributed in the facility area where the footwall area is also located. This causes a limitation in microseismic monitoring due to ray coverage. In this study, we conduct a seismometer deployment outside a mining facilities area with borehole seismometers. The study aims to maximize the resolution and minimize the monitoring uncertainty of underground mines. We created two scenarios of seismometer deployment: (i) seismometers are deployed following the intrusion mining level in the mining facility area; and (ii) additional seismometers are deployed in off-facilities areas. Both areas were tested for their raypath responses and sensitivity using the Checkerboard Resolution Test (CRT). The monitoring resolution influenced by the additional borehole seismometers in the off-facilities area can be quantified. The results suggest that the additional seismometers in the off-facilities areas can increase resolution by 30% in the seismogenic and abutment zones.

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“…The SLC is the most active area of the underground operations, with seismicity linked to cave production, growth and SLC production blasting. The seismic history at Telfer is discussed further by Woods et. al (2018).…”

Section: Introductionmentioning

confidence: 99%

Rapid assessment of the spatial extent of strong ground motion in mines – ShakeMap approach

Meyer¹,

Doolan²,

Chester³

et al. 2018

Proceedings of the Fourth International Symposium on Block and Sublevel Caving

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Rapid assessment of areas that may experience damage during large seismic events is an important task of seismic monitoring in rockburst-prone mines, particularly in the seconds to hours following the event. Correctly installed sensors of the appropriate type allow instantaneous and accurate measurement at the location of the sensor. However, the ground motion at any point in the mine could be of interest. Traditionally, this assessment at locations away from sensors was estimated using ground motion prediction equations (GMPEs); specially calibrated equations describing the relationship between ground motion, event strength (radiated seismic energy or seismic potency) and distance. However, the uncertainty in these equations is often quite significant due to complexity of the problem, e.g. radiation pattern effects, extended seismic sources, variations in attenuation characteristics, and uncertainty in source parameters. We improve the accuracy of these estimations by combining the measurements at sensors with a GMPE in an approach known as ShakeMap, popular in crustal seismology. This allows for rapid and more accurate estimation of ground motions at any location following a large event. This knowledge can play an important role in planning of potential post-event evacuation operations and damage assessments. The method is demonstrated on examples from an Australian sublevel caving mine.

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Progression and management of seismic hazard through the life of Telfer sublevel cave

Cited by 3 publications

References 0 publications

A case study: managing decline deformation in an active sublevel caving operation

A case study: managing decline deformation in an active sublevel caving operation

Testing the Utilization of a Seismic Network Outside the Main Mining Facility Area for Expanding the Microseismic Monitoring Coverage in a Deep Block Caving

Rapid assessment of the spatial extent of strong ground motion in mines – ShakeMap approach

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