2021-12-07_REVISION - M2012032 (26)

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6. Dealing with Frozen Conditions on Site and Temporary Tailings/Waste Rock Storage As stated above, proper compaction cannot be safely achieved if the air temperature is lower than 30 degrees F. This will basically apply to many months throughout the winter and some days in the fall and spring. Since these conditions will be frequently encountered, all tailings and waste rock must be taken to a temporary storage area for compaction during warmer weather. Since the avalanche path at the Revenue Pile area prevents its safe use in winter months, the material should be stockpiled at the Atlas Pile, unless some area of the Revenue Pile can be identified that is out of the known avalanche path zone. The Atlas Pile can only be reached by the new bridge across County Road 26 immediately uphill of the Revenue Pile area. Atlas Creek cannot be crossed to reach the Atlas Pile. Rules: a- In winter conditions, when air temperatures are less than 3o degrees F, all tailings and waste rock should be taken to a temporary stockpile area either out of the avalanche path at the Revenue Pile or to the Atlas Pile. In unusual cold conditions in spring and fall, when there is a high probability that temperatures will increase to allow proper compaction, and if there is no threat of avalanche, material can be temporarily stockpiled at the Revenue Pile. This material should be spread, compacted and tested as soon as temperatures increase. b- As temperatures rise in spring, there will be a large amount of stockpiled material that will require compaction.Material stockpiled over the winter must be carefully reworked to ensure that no compaction is attempted on material that has frozen deep into the temporary stockpile. c- Before activities commence in late spring at the Revenue Pile, mine personnel must confirm that potential for avalanches has been addressed and that personnel can enter the area of the Revenue Pile. 4