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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 C O L O R A D O <br /> <br />Phone: (303) 866-3567 D I V I S I O N O F <br />RECLAMATION <br />FAX: (303) 8328106 TECHNICAL MEMORANDUM MINING <br /> <br /> SAFETY <br /> <br />DATE: <br />25 March 2011 John W. Hickenlooper <br />Governor <br /> Mike King <br />TO: Wallace Erickson Executive Director <br /> Loretta E. PiAeda <br />FROM: David Bird A4 Director <br />SUBJECT: Geochemistry and Water Quality Review; Wildcat Mayday; DRMS File No. <br /> M-1981-185; Conversion Application CN-I <br />The following comments are provided in response to the Applicant's Conversion Application CN-1: <br />1) Exhibit D - Mining Plan; Rule 6.4.4(c), page 5 (note: mislabeled as 6.4.3(c)). With regards to <br />the proposed augmentation pond, in accordance with Rule 3.1.6 in reference to protection of <br />water quality, the applicant must add the augmentation pond to the surface water monitoring <br />program, to allow comparison of the water quality of the pond with the quality of water to <br />which the pond might be discharged. <br />2) Exhibit E - Reclamation Plan; Reclamation Effort 3: Closure and Final Reclamation, page 3. <br />The Applicant states that solid waste will be placed in the mine rock storage stope. Please <br />describe the solid waste that will be placed in that location. <br />3) Exhibit E - Reclamation Plan; Rule 6.4.5(2)(c), item 2, page 6: The Applicant states that run <br />of mine rock will be placed underground or adjacent to existing benches, and will be stable <br />without additional compaction. Be advised that any material left outside in the elements for <br />extended periods will need to undergo geochemical testing. <br />4) Exhibit E - Reclamation Plan; Rule 6.4.5(2)(c), item 2, page 6. The Applicant states that best <br />management practices will be put in place to prevent toxic or acid-forming materials migrating <br />offsite. Please describe the BMPs or state where in the application the information may be <br />found. <br />5) Exhibit E - Reclamation Plan; Rule 3.1.7(2)(c)(ii), page 7. Please describe how ambient <br />ground water quality will be determined. <br />6) A. Exhibit E - Reclamation Plan; Rule 3.1.7(6), page 10. The Applicant must specifically state <br />where the points of compliance (POC) will be for surface water. Sampling station SW-2 <br />appears to be satisfactory as the surface water POC, but this must be explicitly stated in the <br />application. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines