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5.1.1.3 Phosphorus Pentasulfide (P2S5) and Nokes Reagent(NR-1) <br /> Description: P2S5 is a greenish-yellow solid that is combined with caustic soda (NaOH) and <br /> water to form Nokes reagent. Nokes reagent is incorporated into the mill circuit as a lead <br /> depressant. While solid P2S5 can cause skin irritation, the primary health hazard is the release of <br /> hydrogen sulfide gas upon contact with water. Climax utilizes instant Nokes reagent (NR-1) <br /> which is a pre-mixed compound consisting of P2S5 and NaOH. <br /> Location: Nokes Building and adjacent storage dock. <br /> Spill Potential: Low. <br /> Potential Volume Spilled: One drum of granular material or 400 pounds on the dock; or up to <br /> 1500 gallons in the holding tank in the Nokes Building. <br /> Prevention and Control: Spills of granular P2S5 on the storage dock at the Nokes Building can <br /> be contained by diking with sorbent booms, sand bags, or by simple containment with a shovel. <br /> Spillage or leakage of liquid Nokes reagent in the 1500-gallon tank in the Nokes Building is <br /> controlled by a recessed sump capable of holding 8000 gallons. Spills of granular P2S5 around <br /> the mixing hopper in the Nokes Building can be controlled in a manner similar to those on the <br /> storage dock. <br /> Countermeasures: Spills of granular material should be scooped up with a shovel and either <br /> replaced in the storage container or fed into the mixing tank hopper. Liquid spills in the sump <br /> can be either pumped back into the holding tank or into the Regrind Thickeners. P2S5 can be <br /> neutralized with lime or NaOH (sodium hydroxide) if the liquid Nokes reagent escapes <br /> containment at the Nokes Building and threatens to flow in the adjacent ditch. <br /> Nearest Clean-up Equipment: A spill kit is located in the western end of the mill building. <br /> Shovels are located on the Nokes Building storage dock. <br /> Monitoring: The Nokes Building is checked daily during mill operation. Weekly checks are <br /> made when the mill is not operating. <br /> Reporting: Spills of over 100 pounds which threaten the waters of the State of Colorado are <br /> subject to the reporting requirements of Sections 4.2, 4.3, and 4.4 of this SPCC Plan. All spills <br /> should be reported to the Environmental Coordinator by using the "Spill Incident Report" form <br /> given in Appendix 1. <br /> 12 <br />