2017-09-18_REPORT - M1980244 - Laserfiche WebLink

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NEWMON T Newinont Mining Corporation CrFpie Creek&Victor Gold Mire 100 Nortn 3" St•eet P O Box 191 T 719-689-",';29 F 719-o89-Q254 w•,vr:re.vmcrt-cm SENT CERTIFIED, RETURN RECEIPT REQUESTED 7015 1660 0000 0779 9635 September 14, 2017 RECEIVED Mr. Timothy Cazier,P.E. SEP 18 2017 Environmental Protection Specialist DMSION OF RECLAMATION Colorado Department of Natural Resources MINING AND SAFETY Division of Reclamation,Mining and Safety Office of Mined Land Reclamation 1313 Sherman Street,Room 215 Denver, Colorado 80203 Re: Permit No.M-1980-244; Cripple Creek& Victor Gold Mining Company("CC&V"); Cresson Project -Written notification—Float Concentrate Slurry Spill—September 11,2017 Dear Mr. Cazier: In accordance with Rule 8, Section 8.2.3 of the Mineral Rules And Regulations of the Colorado Mined Land Reclamation Board For Hard Rock, Metal, And Designated Mining Operations (Rules), the Cripple Creek and Victor Gold Mining Company (CC&V) hereby provides the Division of Reclamation, Mining and Safety (Division) with a formal report regarding the Concentrate slurry spill which occurred at the Concentrate thickener at the High Grade Mill(HGM), which occurred late morning September 11, 2017. The following points address the requirements of Rule 8, section 8.2.3: a. Actions taken to respond to and correct the emergency situation or condition • The spill was observed by a mill operator preforming a daily walk around inspection. The spill resulted from a small hole in the bowl of the 34A pump (see photo 1). The slurry was spraying from the pump to just outside of the concrete secondary containment stem wall (photo 2). Very little slurry spilled into the secondary containment. The spill occurred because the service doors to the area below the thickener were left partially open, thus allowing the slurry to spray out of containment. CC&V estimates that approximately 25 gallons of slurry were spilled outside of the float concentrate thickener secondary containment. • The 34A slurry pump was immediately shut off and the valves feeding the pump were closed. The redundant 34B slurry pump was turned on, and the process returned to normal in a matter of minutes. • A front end loader was used to recover the float concentrate slurry and the contaminated soil. The concentrate slurry is very thick, thus not allowing it to infiltrate more than an inch or two. The soil was removed using an `over-excavation' approach. Depth of recovery ranged from 6 inches to 18 inches (see photo 3). Slurry was recovered from the first few inches of soil; the underlying soil was not wet;therefore, CC&V can ensure that all contaminated soil was removed.