2012-08-24_REPORT - M1980244 (11)

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"AVA WI Ime loader and a CAT 992 front -end loader was used to load overburden fill material Into CAT 40 -ton articulating and CAT 777 haul trucks. Overburden fill was placed in the areas shown on Figure 1. Various CAT excavators with a hammer attachments "broke up" oversize boulders before they were placed in the fill. Overburden fill was placed in 18" to 24" lifts using various CAT dozers, keying into existing slopes when necessary. 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 CAT 345 excavator, a Hitachi 350 excavator, and a CAT D -6 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) Underdrain Underdrain construction is complete for the Mill Site Earthworks project. I) Miscellaneous A CAT D -8 dozer and a Hitachi 350 excavator were used to construct access and pole locations preparing relocate the power line within the Mill Site footprint. II) Underground Mine Workings A) Discovery During cut to fill two Underground Workings were encountered. The locations were surveyed by Ames and given a project designations of UG#4071 and UG#4072. B) Drilling Confirmatory drilling was performed at Underground Working #4007. A drill pattern was set out by an AMEC field representative. Fourteen holes were drilled encountering no voids. An approximate total of 700 lineal feet was drilled. As -built survey of the drill holes was performed by Ames. MEW Weekly Report WE 03.24.2012