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If auger, punch or other highwall types of mining systems are to be considered in the <br />future, a Ground Control Plan amendment will be required. Planning for any highwall <br />mining system should include, but is not limited to: highwall stability, coal web <br />thickness between openings, opening dimensions, barrier pillar design, scam thickness <br />safety factors, calculations necessary to ensure prudent mining desi <br />safeguards. g gn, and operational <br />If you have any questions regarding the filing of this plan, please contact Ron Gehrke at <br />303-231-5587, or Matt Lemons at 303-231.5570, <br />Sincerely, <br />1:3'� � �� <br />Russell J. Riley <br />District Manager <br />Fnclosure <br />