2012-08-24_REPORT - M1980244 (14)

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• D) Overburden Fill Placement Overburden fill material was delivered from CC &V Mine Operations throughout both day and night shifts. An Ames CAT D -10 dozer was used to maintain the borrow area. A CAT 993 front -end loader and a CAT 992 front -end loader were used to load overburden fill material into CAT 40 -ton articulating, CAT 773, and CAT 777 haul trucks. Overburden fill was placed in the areas shown on Figure 1. Overburden fill was placed in 36" to 40" loose lifts using various CAT dozers, keying into existing slopes when necessary. Various CAT excavators with a hammer attachments "broke up" oversize boulders before they were placed in the fill. Each lift was moisture conditioned using a CAT 773 water truck (when necessary) and compacted using a 10 -ton vibratory smooth drum compactor, passing over the entire fill surface at least 4 times (method compaction technique was applicable). Subgrade temperatures were monitored by an AMEC field representative prior to fill placement. Fill material was not placed until the entire fill area was at or above 32 °F. Fill temperatures were then monitored every hour during ambient temperatures below 32 °F. No frozen material was placed during the week. E) Slope Contouring Slope contouring was performed using a CAT 330 excavator, a John Deere 850 excavator, a CAT D -6 dozer, a CAT D -8 dozer, and a CAT D -10 dozer. Material generated during slope contouring was placed as overburden fill at the top of the slope. F) Soil Liner Fill (SLF) No work performed during the week. G) Drain Cover Fill (DCF) No work performed during the week. Location This Week Cumulative Comments DCF Process - 158,613 DCF processing is temporarily paused Total - 158,613 DCF processing is temporarily paused H) Miscellaneous No work performed during the week. II) Underground Mine Workings A) Discovery No new Underground Workings were encountered during the week. B) Drilling Confirmatory drilling was performed at Underground Working #4074 using two track mounted drill rigs. A drill pattern was set out by an AMEC field representative. Thirty -one holes were drilled encountering six voids. An approximate total of 1550 linear feet was drilled. As -built survey of the drill holes was performed by Ames. MEW Weekly Report WE 04.14.2012