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® Climax a <br /> Climax Molybdenum Pass <br /> Highway 91 - Fremont Pass <br /> 0429 <br /> A Freeport-McMoRan Company Climax, )4 87718 <br /> p p y Phone (719)486-7718 <br /> Fax (719)486-2251 <br /> April 1, 2021 <br /> Mr. Dustin Czapla RECEIVED <br /> Environmental Protection Specialist <br /> Division of Reclamation, Mining and Safety APR 08 2021 <br /> Department of Natural Resources <br /> 1313 Sherman St. Room 215 Divlslort Ur RECLAMATION <br /> Denver, Colorado 80203 MINING AND SAFETY <br /> RE: Climax Mine, Permit No. M-1977-493,Reagent Testing <br /> Mr. Czapla, <br /> Climax Metallurgy would like to run a short test on four new depressant reagents that would be used <br /> in the flotation process. The reagents are Exp 3-3, Exp 3-4, Exp 3-5, and Exp 3-6 from Chemstar <br /> Products Company (see attached SDS's). The proposed dosing rate for these reagents would be <br /> 0.066lb/ton of ore. The test will occur at lab scale in our met lab over the next month. All of the <br /> reagents amount to approx. 10 pounds 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 /> Al\l,(- Or�-� <br /> Alex Ungers <br /> Senior Environmental Scientist <br /> attachments <br />