Phelps Dodge Sierrita Mine MAKING MINING SAFER

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CASE STUDY: Phelps Dodge Sierrita Mine MAKING MINING SAFER SUCCESSFUL TRIAL OF SSR MONITORING SOLUTION IN THE The SSR technology complements existing slope monitoring UNITED STATES programs and has demonstrated early warning of slope movements with good definition of the extent of the affected Phelps Dodge Mine Technology Group areas. began testing the GroundProbe Slope The precision of the deformation data collected, the Stability Radar (SSR) in May 2004, at the ability to monitor in all weather conditions, the broad Sierrita Mine site in south of Tucson, area coverage, the reflector-less scanning, the ease of deployment, and the automated alarming capabilities are Arizona. strong positive features of the SSR technology. This unit, the first GroundProbe SSR in the U.S., was brought The Phelps Dodge Mine Technology Group has into the country under FCC Special Temporary Authority recommended this technology to most of its mine sites. grant for experimental trial. FCC licensing has been granted and mines are on track for integration of additional SSR units within the Phelps Dodge The radar system has proven to provide early warning of Mining Company. accelerating wall movement at Sierrita. It has also provided much needed information about slope behaviour in Vicki Seppala, Mine Technology Group, Phelps areas where access limitations prevented the use of other Dodge Mining Company. monitoring tools. The set of figures provided describe a slope movement at Sierrita Mine, where the radar unit provided approximately three hours additional warning of slope acceleration over slide-wire extensometers and prism targets located within the moving mass. Additionally, the deformation plot on the SSR-Viewer gave clear spatial definition of the extent of the wall that ultimately released some eight hours later (~20k tons). Due to the early warning provided by the SSR, operations had sufficient time to ensure that no equipment or personnel were exposed to the potential rock fall hazard. ™ groundprobe.com.

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