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DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone- (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />STATE OF COLORADO <br />COLORADO <br />DIVISION Of <br />RECLAMATION <br />MINING <br />SAFETY <br />MEMORANDUM John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta Pineda <br />To: Stephanie Reigh Director <br />From: Tim Cazier, P.E. 71 <br />Date: April 3, 2014 <br />Re: Mineral Joe Mine Drainage Design —Third Adequacy Review, Permit No. M- <br />1977 -284 / AM -01 <br />The Division of Reclamation, Mining and Safety (DRMS) engineering staff has reviewed the <br />October 2013 Drainage Design Plan for the Mineral Joe Mine prepared by Whetstone <br />Associates, Inc. The following comments are posed to ensure adequate engineering analyses and <br />design practices are implemented to eliminate or reduce to the extent practical the disturbance to <br />the hydrologic balance expected by the mining operation with respect to water quality and <br />quantity in accordance with Rules 3.1.6(1), 6.4.21(10) and 7.3.1. Please note, as this site is a <br />designated mining operation (DMO), compliance with Rule 7.3.1 is applicable, thus requiring <br />certified designs and specifications for engineered elements associated with the environmental <br />protection plan (EPP). (Note: the site specific technical and engineering content for this <br />submittal is essentially the same as that submitted for the JD -6 Mine. The comments below are <br />very similar, if not identical to comments on the JD -6 submittal, but are submitted separately as <br />the two sites are separate permits). Please note the original comment number sequence has been <br />retained for tracking purposes. <br />Previous Comments: <br />1. The hydrologic method and analyses... No response required. <br />2. Page S, section 2.3.1. Trapezoidal channels... Cotter's commitment to reconstruct the <br />UDS with 31-1: IV side slopes is adequate. No additional response is necessary. <br />3. Page 6, Cowan's formula. The response is adequate. <br />4. Cowan's method results in higher Manning's values... The provided response is partially <br />adequate. Based on various meetings and telephone conversations, I believe it is <br />understood by all what the expectations by DRMS are for providing hydraulic <br />evaluations /analyses for both stability (low range of an appropriate Manning's n) and <br />capacity (high range of an appropriate Manning's n) for each separate reach of channel <br />where either the channel geometry, longitudinal slope, or design peak flow changes. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines <br />