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r. <br />I hope this provides you with enough information to evaluate the proposed <br />methodologies. Should you have any questions, please give me a call at 242-2828. <br />This is a company called Computer One, another one of my ventures. <br />As an interesting aside, I was visiting at Sufco in Utah recenl:ly. They have done <br />monitoring over full-extraction room-and-pillar panels. They are mining under the <br />Castlegate sandstone (thick and massive). Their average draw angle was 15° with a <br />maximum observed draw angle of 210. So I believe the assumptions that are being <br />used for the Empire Mine site are reasonably conservative. <br />Thank you for your attention to this matter. <br />Very truly yours, <br />~~' <br />Collin L. Stewart <br />cc: Larry Damrau, Empire Energy Corp. <br />Dan Keuscher, ACZ, Inc <br />