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Climax Molybdenum Climax Mine <br /> ® Highway 91 - Fremont Pass <br /> A Freeport-McMoRan Com an Climax, CO 80429 <br /> p p y Phone (719)486-7718 <br /> Fax(719)486-2251 <br /> August 11, 2021 RECEIVED <br /> Mr. Dustin Czapla AUG 13 2021 <br /> Environmental Protection Specialist <br /> Division of Reclamation, Mining and Safety DIVISION OF RECLAMATION <br /> Department of Natural Resources MINING AND SAFETY <br /> 1313 Sherman St. Room 215 <br /> Denver, Colorado 80203 <br /> RE: Climax Mine, Permit No. M-1977-493,Reagent Testing <br /> Mr. Czapla, <br /> Climax Metallurgy would like to run a short series of 1 kg bench float test on a new depressant <br /> reagent that would be used in the flotation process. The reagent is AERO NR-7361 manufactured by <br /> Cytec Industries Inc. (see attached SDS). The proposed dosing rate for this reagent would be 0.06- <br /> 0.73lb/ton of ore. The test will occur at lab scale in our met lab over the next month. The total <br /> reagent amount is approx. 50-500 mL and will be stored in containers in the met lab with proper <br /> containment. In the event we have any leftover reagents after testing has completed, we will dispose <br /> of the remaining chemical in accordance with waste regulations. We will update the EPP if we <br /> decide to make this change permanent. <br /> Please let me know if you have any concerns. We would like to begin the test as soon as possible. <br /> Sincerely, <br /> Alex Ungers <br /> Senior Environmental Scientist <br /> attachments <br />