2011-11-19_REPORT - M1980244 ‎(3)‎

• Permit No: M1980244
• IBM Index Class Name: Report
• Doc Date: 11/19/2011
• Doc Name: FINAL REPORT, VOLUME 2 OF 3 ‎(continued)‎ 2011 phase 5 valley leach facility ore storage 2 OF 3
• From: CC&V
• To: DRMS
• Media Type: D
• Archive: No

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F) Cut to Fill
1) VLF
A CAT 385 excavator and a John Deere 850 excavator were used to excavate structural fill
material from between stations F1 +50 ( + / -) and F2 +50 ( + / -), approximately 200 to 275 feet
right of centerline and between stations H3 +10 ( + / -) and H4 +75 ( + / -), approximately 250 to
275 feet left 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 34F to 48F. No fill materials placed Monday (12/712009), Tuesday
(12/8/2009), or Wednesday (12/9/2009) due to cold ambient and existing fill temperatures.
During shifts were fill placement was possible, preparations were performed for two to three
hours before fill temperatures were within project specification
Structural fill was placed between stations B0 +50 ( + / -) and B4 +00 ( + / -), approximately 75 feet
left of centerline to 75 feet right 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). Ambient and
fill temperatures were monitored and recorded during the placement of the processed ore in
this area.
Structural fill (processed ore) was placed within the Phase IVa VLF between stations G12 +00
( + / -) and G28 +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 station 171 +50 ( + / -) and F2 +50 ( + / -),
approximately 200 to 250 feet right of centerline and between stations H3 +10 ( + / -) and H4 +75
( + / -), approximately 50 to 75 feet left of centerline using three track mounted drill rigs.
Blasting was performed in these areas Tuesday (12/8/2009) and Thursday (12/10/2009).
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 12.12.09.D.doc