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® Climax Mine <br /> Climax MolybdenumHighway 91 - Fremont Pass <br /> 0429 <br /> A Freeport-McMoRan Company Climax, 8 <br /> p p y Phone (719) 486-7718718 <br /> Fax (719) 486-2251 <br /> June 23, 2021 <br /> Mr. Dustin Czapla RECEIVED <br /> Environmental Protection Specialist J U N 2 9 2021 <br /> Division of Reclamation, Mining and Safety <br /> Department of Natural Resources DIVISION OF RECLAMATION <br /> 1313 Sherman St. Room 215 MININGANDSAFETY <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 test using a new depressant reagent that would be used <br /> in the flotation process. The reagent is Unimax SD200 from Indorama Ventures (see attached SDS). <br /> The proposed dosing rate for these reagents should not exceed 100 grams/ton of ore. The test will <br /> occur at lab scale in our met lab over the next month. The amount of the reagent is four ounces and <br /> will be stored in containers in the met lab with proper containment. In the event we have any leftover <br /> reagents after testing has completed, we will dispose of the remaining chemical in accordance with <br /> waste regulations. We will update the EPP if we 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 />