2009-12-11_REPORT - M1980244 (4)

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amid? Earth & Environmental E) Overburden to Stockpile 1) VLF No work performed during the week. F) Cut to Fill 1) VLF A CAT 385 excavator and a John Deere 850 excavator were used to excavate structural fill material between stations E14 +00 ( + / -) and E16 +00 ( + / -), approximately 0 to 50 feet right of centerline and between stations J27 +00 ( + / -) and J29 +00 ( + / -), approximately 75 to 100 feet right of centerline. The structural fill material was loaded into CAT 777 haul trucks. Prior to structural fill placement existing fill areas were ripped and frost was allowed to thaw or was removed. Existing fill temperature were monitored and found to be above 32 °F before fill placement. An AMEC representative monitored ambient temperatures on an hourly basis during fill placement. Fill temperatures were monitored during ambient temperatures below 32 °F and averaged 39 ° F to 44 °F. Structural fill was placed in the following areas: between stations B 1 +00 ( + / -) and B4 +00 ( + / -), approximately 50 feet left of centerline to 50 feet right of centerline; between stations D1 +00 ( + / -) and D4 +00 ( + / -), approximately 0 to 75 feet left of centerline; between stations F1 +50 ( + / -) and F3 +50 ( + / -), approximately 0 to 50 feet right of centerline; and between stations J16 +00 ( + / -) and J22 +50 ( + / -), approximately 50 to 75 feet left of centerline. Structural fill was placed in 18" to 24" lifts using various CAT dozers. 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 is applicable). Structural fill (processed ore) was placed within the Phase IVa VLF between stations G13 +00 ( + / -) and G15 +00 ( + / -), approximately 75 to 150 feet right of centerline. Fill material (processed ore) was excavated from the Phase IVc re- certification area, the old LOB haul road, and the southeast corner of Phase IVa using a CAT 375 excavator loading the material into 40- ton articulating haul trucks. Structural fill was placed using a CAT D -8 dozer in 12" loose lifts and moisture conditioned as needed using a CAT 773 water truck. Compaction was achieved using a 10 -ton vibratory smooth drum compactor. Nuclear density testing was performed with results averaging 95% of maximum dry density. Moisture density relations were obtained in accordance with ASTM D698 -07. Ambient and fill temperatures were monitored and recorded during the placement of the processed ore in this area. Blast pattern drilling was performed between stations E12 +00 ( + / -) and E16 +00 ( + / -), approximately 0 to 50 feet right of centerline using three track mounted drill rigs. Blasting was performed in these areas Monday (11/23/2009) and Tuesday (11/24/2009). G) Material Processing 1) South Cresson Clay Processing Area Processing of Soil Liner Fill material continued at the South Cresson Clay Process. A CAT D -8 dozer, a CAT 320 excavator, and a CAT 966 front -end loader were used to process the material. VLF Weekly Report WE 11.28.09.D.doc