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1. Several cable extensometers spanning the upper incipient scarp with data logger and <br />landline or satellite-uplink with continuous graph and alarm threshold capability. This <br />would be the most cost-effective system. A system similar to this is currently active, <br />monitoring cable extensometers on a large landslide that threatens Interstate 70 in <br />western Colorado. This proprietary system is called Satalarm developed by AMCi., web- <br />site: http://www.amc-wireless.com/ <br />2. Automatic 3D laser scan monitoring system that has the ability to continuously scan the <br />quarry face with software that can both comparatively record succeeding readings of the <br />quarry wall and headscarp, and provide alarm threshold capability. <br />3. Automated robotic total station surveying with reflectorless capability that can also be <br />integrated to an alarm system when movement thresholds are met. An example of such <br />a system is Leica GeoMoS (Geodetic Monitoring System): http://www.leica- <br />-geosystems.com/corporate/en/ndef/lqs 4802.htm <br />4. Slope Stability Radar. This newer technology using radar, which can discern sub- <br />millimeter movements in rock, is probably not feasible for the economics of this mine. <br />Additional information can be found at this vendor's web site: <br />hftp://www.groundi)robe.com/slopestability.html <br />Such warning systems are becoming routine for rock monitoring of large open-pit mine <br />operations. <br />The installation of mounted prisms or GPS stations on the head scarp or within the <br />rubble zone is discouraged because of the potential hazard to personnel during installation. <br />Without an active monitoring program with movement threshold alarm ability, the quarry wall <br />should be closed and fenced off as a hazard area. <br />Long-term mitigation options are limited because of the threat of failure of the upper <br />blocks of rock between the tension cracks (i.e., upper incipient scarps) and the major head <br />scarp of the rockslide. We see no viable in-situ rock stabilization method to stabilize these <br />upper blocks. We offer the following options as being feasible. <br />1. While the upper block is continuously monitored, fill Area H (the Hole) to buttress the <br />existing rockslide and leave upper scarp and tension cracks as a secured (fenced) long- <br />term hazard zone with an on-going monitoring program. Rockfall protection methods <br />11