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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 />TECHNICAL MEMORANDUM <br />STATE OF COLORADO <br />DATE: 23 August 2011 <br />TO: Wallace Erickson <br />FROM: David Bird <br />SUBJECT: Geochemistry and Water Quality Review; Wildcat Mayday; DRMS File No. <br />M- 1981 -185; Conversion Application CN -1, Submittal of 9 August 2011 <br />Mined Land Reclamation <br />COLORADO <br />D I V I S I O N O F <br />RECLAMAT ION <br />MINING <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />The following comments are provided in response to the Applicant's Conversion Application CN -1 <br />Submittal received 9 August 2011: <br />A. Attachment D -5, Dry Stacked Tailings Work Plan, Rule 6.4.21(8) <br />Adequacy Issue #17 from Technical Memorandum of 3 May 2011. Dry stack tailings <br />The Applicant states: Dry stack tailings typically produce a stable deposit requiring no retention <br />binding. <br />1) The Applicant will need to provide references /examples of sites where this has been <br />successfully employed. The Division will need to inspect the proposed location underground <br />where the dry stacked tailings will be deposited before sign oil. <br />2) In addition to the items listed under Environmental Engineering Summary, the Applicant must <br />identify and map any locations in the disposal area that are seeping water into the drift. This <br />mapping should be done during the late spring or early summer, when the chance of seepage is <br />greatest as is the ability to identify and map them. The Applicant must commit to consolidation <br />grouting of fractures or other weaknesses in the drift that produce ground water seepage if the <br />seepage has the potential to come into contact with the disposed tailings. <br />3) Under Field Management, the first water sample`collected must include the complete ground <br />water analytical suite. The analytical suite in later samples may be pared down depending on <br />the results of the earlier sampling and only with Division approval. <br />4) State the means by which the tailings will be conveyed to the disposal area, i.e., pipeline, <br />haulage, or other means. <br />Office of Office of <br />Denver • Grand junction • Durango Active and Inactive Mines <br />