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Interoffice Memorandum <br /> <br />Please have Colowyo provide the necessary information to show how they plan on mitigating the potential for <br />subsidence and avoiding penetration of the outer slope while highwall mining the southern wall of the South <br />Taylor Pit. <br />2.Within AA’s Report, they state that depth of cover can be chosen based on a weighted average formula as <br /> <br />follows: <br />Design Depth = 0.75(maximum depth) + 0.25(minimum depth) <br />For clarification, please have Colowyo elaborate on the rational for this assumption or provide a source for this <br />equation. <br />I have no additional comments or questions relating to Colowyo’s TR-103. If you have any questions, feel free to contact <br />me. <br />Sincerely, <br />Zach Trujillo <br /> <br />