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Technical Revision 23, Mining Permit M-1977-300 Mr. Robert Noren <br /> Disposal of Alluvial Fill Cotter Corporation(N.S.L.) <br /> Three disposal options were discussed in TR-14 and are presented below: <br /> 1. Disposal in an existing mine void, known at the CV Glory Hole. Access is up a steep <br /> dirt road to the Minnesota Portal and then to the Glory Hole through the Minnesota <br /> Portal. The estimated available volume in the Glory Hole is close to the maximum <br /> storage requirement of 54,000 cy. <br /> 2. Disposal in an existing engineered above ground WRP. There are currently two <br /> engineered WRPs at the site, a South WRP (on the south side of the creek) and a <br /> North WRP (on the north side of the creek). Both WRPs are located hydrologically <br /> up gradient(west) of the alluvial fill removal area. <br /> 3. Disposal Off Site <br /> a. Transport the material to Cotter's tailings impoundments at the Canon City <br /> Milling Facility. However, the Canon City Mill is undergoing reclamation and is <br /> no longer an option for disposal. <br /> b. Disposal at the nearby Foothills Landfill. This landfill, operated by Allied Waste <br /> Services, is a Subtitle D industrial disposal facility located about 7 miles north of <br /> Golden, Colorado. <br /> 3.3 Amendment 4, Summary <br /> As discussed in Section 1.0, Mine Permit Amendment 4 (Cotter, 2012) was submitted presented <br /> to CDRMS on May 1, 2012 and includes an updated Reclamation plan. The proposed option for <br /> storage of the alluvial fill was placement it the CV Glory Hole, discussed in Section 3.2 and TR- <br /> 14. It was also stated that the space available in the CV Glory might not accommodate all the <br /> excavated alluvial fill and the remaining material would be sent for disposal at an alternate <br /> location. <br /> 4.0 STORAGE OF SOURCE TERM MATERIAL OVER THE SOUTH AND NORTH <br /> WASTE ROCK PILES <br /> 4.1 Technical Approach <br /> The estimated volume of alluvial fill to be removed is 32,000 to 54,000 cy (Cotter, 2011). The <br /> alluvial fill will be placed over the existing WRPs using standard earth moving equipment in <br /> accordance with the 1983 approved Mine Plan Amendment (Cotter, 1983). The proposed <br /> location of alluvial fill placement is shown on Figure 3-1. The volume available in the top of the <br /> South WRP in its current configuration is shown to be 78,000 cy (Figure 3-1), thus, additional <br /> storage is available if the excavation volume exceeds the 54,000 cy. An additional 28,400 cy <br /> (Figure 3-1) is available in the top of the North WRP in its current configuration. The alluvium <br /> excavation material will initially be placed on the South WRP. If that location does not have <br /> sufficient volume, the North WRP will be utilized. The storage locations proposed to be utilized <br /> December 28, 2015 4 Engineering Analytics, Inc. <br />