2021-08-17_REVISION - M1977342 (4)

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TR-34 to Permit M-1977-342 Environmental Protection Plan combustible, #2 diesel is an aspiration hazard and a skin irritant. In the environment, #2 diesel reacts similar to other petroleum fuels and can cause short-term damage to terrestrial and aquatic ecosystems. Collector Oil (Vapor Oil -Calumet Hydrocal 60 or equivalent; Diesel #2 may be used as a backup) is a light naphthenic petroleum oil which is used in the mill circuit as a collector/rougher reagent. It is non-hazardous and practically non-toxic through dermal or ingestion pathways. In the environment, this reagent is stable. It should be treated similar to any petroleum product should spills or releases occur. Hydrochloric acid is used in the mill circuit in the lead leaching process. It is an acidic corrosive that can affect the human body through inhalation, ingestion, and dermal contact. It is corrosive to any tissue with which it contacts. Effects can vary from mild irritations to severe burns (internally or externally) depending upon the type, degree, and length of exposure. Repeated chronic exposure to dilute solutions may cause dermal irritations, whereas similar exposure to vapors or mists may cause erosion of teeth and inflammation of the eyes and mucus membranes of the nose, throat, and lungs. Hydrochloric acid is acid forming in aquatic and terrestrial environments. It can be neutralized with the application of alkaline materials. Nokes Reagent is used in the mill circuit to selectively depress sulfides of lead and other metals during the flotation process. It is a highly basic liquid that can affect the human body through inhalation, ingestion and dermal contact. Effects can vary from mild irritations to destructive burns (internally or externally) depending upon the type, degree, and length of exposure. Severe exposures, particularly those resulting from ingestion, can be fatal. Nokes is incompatible with acids which will cause the release of highly toxic hydrogen sulfide gas, and small spills should be cleaned up with inert absorbents or sand. Dowfroth 250-C Frother (or equivalent) is utilized in the mill circuit as a flotation frother. It is a non-hazardous mixed polyglycol. Direct contact with this material may cause mild eye and skin irritation. Dowfroth 250-C Frother is a stable product that is completely miscible with water. It is not considered an environmental hazard. It does not contain OSHA regulated (hazardous) components. Orfom D8 Depressant (or equivalent) is a mineral processing aide that is used in the mill circuit to suppress other metals in the flotation process.This is a corrosive material that causes eye and skin damage. The vapor is combustible and may cause respiratory tract irritation if inhaled. The material can be harmful or fatal if swallowed. Pine Oil is composed of terpene alcohols and hydrocarbons and is used in the mill circuit as a frother reagent. In humans, it may cause skin and eye irritation and may be harmful if ingested or inhaled. However, it is neither characteristically hazardous nor listed as hazardous under federal regulations. Pine oil is stable and non-persistent in the environment. Quicklime (process) is used for neutralization in the mill process water circuit. Henderson receives as stored dry quicklime, also known as dry lime, burnt lime or calcium oxide (CaO). The quicklime is subsequently hydrated or "slaked" to form calcium hydroxide (Ca(OH)2). The slaked lime is then used to neutralize the tailing slurry as it is piped to the TSF. This helps to neutralize Climax Molybdenum Company August,2021 Henderson Operations Page 11 of 45