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<br />temporary overburden stockpile will be used as backfill for the final <br />grading, <br />Regarding the overburden stockpile, a discrepancy exists as to the <br />side elope which is stated to be 1 1/4 H:1V on p. 2.05-34 in text and <br />drawn as 1.SH:1V on Map No. 18. In terms of stability, 2H:1V side slopes <br />would be more acceptable. This is based upon previous spoil pile <br />analyses which determine a safety factor of 1.3 to 1.5. <br />nannnvna_ <br />CYCC is proposing the construction of a temporary overburden <br />stockpile to the west of the first pit in the mining area. This <br />pile will contain spoil from the first cut and will have a life of <br />approximately two years. The sidealopes of the pile are designed at <br />1.5:1 (H:V), which is considered to be stable. Yage 2.05-34a <br />enclosed has been revised to reflect this change. <br />Several considerations contributed to the choice of aidealope <br />grade. The angle of repose of the material is 1.25:1 based on <br />historical observations. A dragline spoil pile eahibita this <br />characteristic and we have had no failures in dragline spoils even <br />when Ieft unteclaimed during wet weather. Another argument in <br />support of this choice ie the sideelope of the overburden pile north <br />of the portal pit. Survey information shove the sideslope of this <br />pile to be approximately 1.75:1 and there have been no slope <br />failures observed. <br />-40- <br />