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Climax Molybdenum <br />A Freeport-McMoRan Company <br />September 29, 2015 <br />Via Email and UPS Priority Mail <br />Mr. Peter Hays <br />Division of Reclamation, Mining and Safety <br />1313 Sherman St., Rm. 215 <br />Denver, CO 80203 <br />RECTIX/Pry <br />✓OCT 0 5 2015 <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />COLORADO OPERATIONS <br />Henderson Mill <br />19302 County Road 3 <br />Parshall, CO 80468 <br />Phone (303) 569-3221 <br />Re: Follow-up Notice for Mill Nokes Building Hydrogen Sulfide Release, Permit No. M-1977-342 <br />Mr. Hays: <br />Henderson Mill is providing this written follow-up notice to a phone call made to you on September 11, <br />2015 pursuant to Rule 8.1 and 8.2 of the DRMS Rules and Regulations. <br />This notice is regarding a spill of phosphorous pentasulfide (P2S5) which occurred inside the Nokes <br />building at the Henderson Mill, ultimately creating the release of H2S gas The initial incident was <br />reported on September 22, 2015 at approximately 9:00 am. The spill of P2S5 occurred during the mixing <br />of Nokes, a chemical reagent used as a depressant in the molybdenum ore flotation process, which is a <br />mixture of P2S5, sodium hydroxide (NaOH) and water. The initial incident, while short in duration, had <br />longer -lasting implications, which drew the entire response out through Friday of the same week. At <br />present, all cleanup has been performed and a comprehensive root cause analysis is in the process of <br />being performed. <br />(a) The Nokes mixing process was immediately and automatically stopped via digital control <br />system programming interlocks, and emergency response personnel were mobilized to <br />contain and clean up the spill of P2S5. <br />(b) The release of hydrogen sulfide on September 22-25 from this incident did not adversely <br />impact human health, property or the environment. <br />(c) The contact person for this event is: <br />Tim Haynes <br />19302 County Road 3 <br />Parshall, CO 80468 <br />729-942-3518 <br />timothy haynes(ofmi.com <br />(d) No analyses were completed as a result of this event. Monitoring of hydrogen sulfide <br />levels in the immediate area of the Nokes building were generally well below <br />occupational action levels. Monitoring levels at the nearest point of public contact, <br />County Road 3, were non-detectable. <br />