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Alb <br />B) Drilling <br />Confirmatory drilling was performed at Underground Working #4020. A drill pattern was set out by <br />an AMEC field representative. Thirty four holes were drilled encountering seven voids. An <br />approximate total of 1,700 linear feet was drilled. As -built survey of the drill holes was performed <br />by Ames. <br />Confirmatory drilling was performed at Underground Working #4029. A drill pattern was set out by <br />an AMEC field representative. Seventeen holes were drilled encountering six voids. An <br />approximate total of 850 linear feet was drilled. As -built survey of the drill holes was performed by <br />Ames. <br />Confirmatory drilling was performed at Underground Working #4031. A drill pattern was set out by <br />an AMEC field representative. Thirty five holes were drilled encountering nineteen voids. An <br />approximate total of 1,750 lineal feet was drilled. As -built survey of the drill holes was performed <br />by Ames. <br />Grouting of missed (non -void) confirmatory drill holes was performed at Underground Workings <br />#4024, #4025, and #4026. A grout pump and laborers were used to place bentonite grout into the <br />"miss" drill holes. <br />C) Remediation <br />A blast was performed at Underground Working #4000 collapsing the crown pillars above the two <br />identified laterals. A CAT 330 excavator was used to excavate the collapsed crown pillar from the <br />working. Excavated material was stockpile near the working to be placed as Coarse Shaft Backfill <br />in the working. Remediation is being performed in accordance with the AMEC UG #4000 <br />remediation plan, revision 2. <br />Underground Working #4038 was investigated using a camera, lowering it down the shaft 50 feet. <br />An AMEC field representative was present during recording of the video. The video was then <br />reviewed by an AMEC and Ames representative. No laterals were identified in the working to a <br />depth of 50 feet. Backfilling of the shaft with coarse shaft backfill was performed using a CAT 330 <br />excavator and 40 -ton articulating haul trucks. The shaft was backfilled to the existing ground <br />surface and will be excavated to allow for concrete plug installation, for safety. An AMEC field <br />representative observed the backfill of the shaft. <br />Underground Working #4041 was investigated using a CAT 330 excavator and observation was <br />performed by an AMEC field representative. Excavation of the area was performed and it was <br />found to be a shallow surface working. The native material was found to be consistent and all <br />signs of a significant working were removed. The working was backfilled with structural fill in 18" <br />to 24" lifts using various CAT dozers. Each lift was moisture conditioned using a tandem axle <br />water truck (when necessary) and compacted using a 10 -ton vibratory smooth drum compactor, <br />passing over the entire fill surface at least 4 times (method compaction technique was applicable). <br />Underground Working #4042 was investigated using a CAT 330 excavator and observation was <br />performed by an AMEC field representative. Excavation of the area was performed and it was <br />found to be a shallow surface working. The native material was found to be consistent and all <br />signs of a significant working were removed. The working was backfilled with structural fill in 18" <br />to 24" lifts using various CAT dozers. Each lift was moisture conditioned using a tandem axle <br />MEW Weekly Report WE 02.04.2012 <br />