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January 2, 2020 Page 1-1 <br />Agapito Associates, Inc. <br />1 INTRODUCTION <br /> <br /> Beginning in 2016, Agapito Associates, Inc. (AAI) was contracted by Trapper Mining, Inc. <br />(Trapper) to perform evaluations of highwall mining (HWM) for several different mining areas at <br />the Trapper Mine, Craig, Colorado. These design efforts built upon a successful trail of HWM of <br />the H Seam in the A Pit in 2007, for which AAI had also provided design guidance. Table 1-1 <br />summarizes the areas studied and the seams currently targeted. Note that the North Ashmore and <br />North Colt Pits are not currently being considered for HWM. <br /> <br /> <br />Table 1-1. Summary of HWM Pits and Seams Mined <br />Study HWM Area (Pit) Seams Mined <br />I, J, North Ashmore and North Colt Pits (AAI 2018) IPit F <br />J Pit G2 <br />N Strikeline Pit (AAI 2019a) N Pit L, M, Q <br />L Pit (AAI 2019b) L Pit H, K, Q <br /> <br /> <br /> Box cuts specifically for HWM are planned for the I, J, and N Pits, while L Pit HWM <br />would be at the limit of strip operations. Figure 1-1 shows the locations of the box cuts and the <br />proposed HWM areas from each pit. Although a specific contractor has not been chosen, for the <br />purposes of the studies performed by AAI, it is assumed that an HWM system with similar <br />capabilities to the ADDCAR Systems LLC (ADDCAR) HWM system will be used, with <br />penetrations of up to 1,200 feet (ft).