1995-08-11_REVISION - M1977493 (9)

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. reagent useage is a part of the production process and is not considered to be grounds for notification to the DMG. However, notification to the DMG will be made as per the review/reporting discussed in Section 1.1.2 in the event that: 1. new types of chemicals, not discussed herein, are added to the process; 2. the storage location of a designated chemical is changed; 3. the containment facility for a designated chemical must be enlarged. 3.1 List of Chemicals and Specific Locations Designated chemicals used at Climax during periods of production and for water treatment during all periods are listed in Table 1. More specific information regarding location and storage of these chemicals is found in Section 5.3.2. Detailed information regarding affects on human health and the environment is found in the MSDS data in Appendix A and in the pertinent portions of the Spill Prevention Control and Countermeasures and Materials Containment Plan (SPCC/MCP) excerpted in Appendix B. The plan in Appendix B also fulfills the requirement in Rule 8.3 for an Emergency Response Plan for designated chemicals. It should be noted that the SPCC/MCP may include references to chemicals (non-designated) and fuels not regulated by or under the jurisdiction of DMG. Most, if not all, of these references have been deleted from this document. 3.2 Known Potential to Affect Human Health and the Environment Sodium C aCN anide� ) Sodium cyanide (cyanide) is utilized in liquid form in the mill circuit to depress pyrite, chalcopyrite, iron and copper. It is delivered to and stored at Climax in solid briquets where it is mixed with water and caustic soda beads (NaOH) to maintain pH 11 for safety. At acidic pHs, highly toxic hydrogen cyanide gas (HCN) develops . Cyanide is a white solid with a faint almond odor which can affect the human body through inhalation, ingestion, and dermal contact. Cyanide can rapidly cut the flow of oxygen from the blood stream to body tissues. At lower levels of exposure, early symptoms include weakness, headache, confusion, nausea, and vomiting. These symptoms may be followed by unconsciousness and death. Cyanide is rapidly removed from the body by the liver and is neither bioaccumulative nor carcinogenic. Strong solutions of cyanide salts are corrosive and may produce ulcers. Cyanide is a naturally occurring compound which breaks down rapidly in the environment by exposure to oxygen, UV radiation(sunlight), and naturally occurring bacteria. In surface waters, however, cyanide can be detrimental since it is more toxic to aquatic life than to humans. Higher concentrations in surface water ponds also can be toxic to terrestrial wildlife species and 7