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REV16531
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REV16531
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Entry Properties
Last modified
8/25/2016 1:27:58 AM
Creation date
11/21/2007 11:16:07 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977378
IBM Index Class Name
Revision
Doc Date
10/25/2004
Doc Name
Submittal
From
Sunnyside Gold Corp
To
DMG
Type & Sequence
TR27
Media Type
D
Archive
No
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To accomplish this modification, SGC commissioned a geotechnical evaluation to <br />determine if a drainage outlet wuld be excavated in the embankment separating the pond <br />and drainage ditch without creating stability problems (enclosed). The evaluation <br />determined that with 3:1 slopes, a stable drainage outlet could be constructed using on- <br />site materials and compaction specifications easily met with typical construction <br />equipment (90 percent). <br />SGC graded (1% typical grade) the pond area to drain to the drainage outlet area with the <br />tailings material removed from the Power Plant Tailings project (TR-26), capped the <br />tailings with 2' of overburden material from the borrow area near Tailings Pond No.4 <br />except for a small azea reserved for placement of any tailings encountered when <br />excavating the drainage outlet and then excavated the drainage outlet. After excavation <br />was complete, this area was also capped with 2' of overburden material. The 2' cover is <br />consistent with the existing reclamation plan. <br />Where tailings were encountered in the excavation for the drainage outlet, the azea was <br />over excavated 3'-5' below sub-grade and geotextile (Amoco #4545 Filter Fabric) was <br />placed to prevent fill material from penetrating any remaining tailings material. Most of <br />the excavation ended in alluvial material except for the interior section of the outlet. The <br />excavation was then brought back to grade in 8" compacted lifts. At sub-grade elevation, <br />the outlet was lined with 40 mil PVC liner. The liner was covered with dirt and cobbles to <br />grade. <br />The hydraulic capacity of the drainage outlet is significantly greater than the diversion <br />ditch it drains to. The diversion ditch was sized for the 100 yeaz storm event from both <br />the pond surface and the up-slope drainage therefore, the drainage outlet is significantly <br />oversized for the pond surface drainage 100 year storm event. <br />The entire Tailings Pond #4 surface and borrow azea was seeded with the Mountain Mix <br />at 25 #/acre, fertilized with 34-17-0 dry fertilizer at 80#/acre and mulched with grass hay <br />at 1 ton/acre. <br />SGC believes the reclaimed configuration follows the basic concept in the current <br />reclamation plan but the contours have been modified to match the availability of <br />material to implement the plan. Included is an as-built plan for the reclamation plan <br />technical revision. <br />In the event Gold King Mines Corporation cannot or does not obtain a MLR permit to <br />take over reclamation responsibilities for the American Tunnel permit azea and SGC <br />implements reclamation of the permit area as is the current situation, a cell will be <br />constructed, using available material, for any demolition debris, mine waste or water <br />treatment sludge that may require disposal as is currently in the plan. This cell will then <br />be capped (2' overburden material) and planted with the "Mountain Mix" as currently <br />approved for this material. This cell will not materially change the configuration of the <br />existing reclaimed surface. <br />
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