2011-12-15_REVISION - M1977493 (2)

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Technical Revision (TR -18) Climax Molybdenum Company Environmental Protection Plan Permit No. M- 1977 -493 respective percentages; <5 %, 10 -30% and 50 -70 %. Spills should be contained with inert absorbents, and contaminated soils removed. Current metallurgical testing is being conducted at 0.040 to 0.060 Ib of frother per ton of ore processed. The frother will be stored in one tank with a capacity of 9,300 gallons. The frother will be stored in the reagent storage area of the mill building (see Mill Building Detail - Area 450 on the south side of the mill building on Figure AM- 06- T -06). Secondary containment with a volume greater than that of the tank will be provided in the reagent storage area (see Reagent Storage Area Detail Figure AM- 06- T -07). Tank level indication will be available locally as well as through the control system. The control system will alarm for a given tank low and high level. A local alarm hom will sound for a given tank high level. In the event of a storage tank failure, the frother will be contained in the reagent storage area via secondary containment. The secondary containment area is equipped with a sump but no sump pump. In the event of a release in this area, a pump will be placed in the secondary containment sump and the frother will be routed back into the process circuit or pumped into a suitable container for proper disposal through direction from the environmental department. A spill that occurs during offloading into the storage tank will be handled similarly using a sump located in the offloading area. T - 3.2.3 Cleaner Frother Cytec Oreprep F -579 Frother (or equivalent) will be used in the secondary mill regrind circuit as a flotation frother. It is comprised of mixed polyglycols. Direct contact with this material may cause mild eye and skin irritation, if ingested immediate medical attention should be obtained. This product may be replaced with an equivalent product in the future. Cytec Oreprep F -579 is a stable product that is completely soluble in water. Cytec Oreprep F -579 has a National Fire Protection Agency rating of 1 for health and for fire, meaning that the material can cause significant irritation and that the material must be preheated before ignition can occur. Anticipated usage rates are 0.005 to 0.010 Ib of cleaner frother per ton of ore processed. The Cleaner Frother reagent will be delivered in 600 gallon totes, which will be stored in the curbed area identified to the north of the iron depressant storage tank (see Reagent Storage Area Detail Figure AM- 06-T-07). The containment capacity of this curbed area is estimated to be in excess of 750 gallons with the low point near the sump of the iron depressant storage area, which would serve to increase the containment capacity in the event of a spill. In the event of a release in this area, a pump will be placed in the secondary containment sump and the cleaner frother will be routed back into the process circuit or pumped into a suitable container for proper disposal through direction from the environmental department. The totes will be transferred into a cleaner frother storage tank (600 gallons). The cleaner frother storage tank will be located in the regrind /cleaner area of the mill building (area 430 on the Mill Building Detail drawing on Figure AM- 06- T -06). Cleaner frother storage tank releases will be kept contained inside of the mill building and will pump to the rougher concentrate thickener. Tank level indication will be available locally as well as through the control system. The control system will alarm for a given tank low and high level. In the event of a cleaner frother distribution system failure, the frother will be contained within the mill building and will be sent to the rougher concentrate thickener. T - 3.2.4 Iron Depressant Orfom D8 Depressant is a mineral processing aid that will be used in the mill circuit to maintain separation and suppress iron and other metals in the flotation process. This is a corrosive material that causes irreversible 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. In the event of a spill, the area will be evacuated and monitored with a combustible gas indicator. Spills will be contained and cleaned up as soon as possible using appropriate techniques, such as applying non - combustible sorbent materials or pumping. The material will be used and stored only in well EPP: Version R2 T -10 December 2011