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<br />~ III IIIIIIIIIIIIIIII * ~,~ ~_~u2 <br />CLIMAX MOLYBADENAUMv COMPA~~ ^~ __ <br />A DIVISION OF AMAX INC. ~ ~ ~~~ <br />HENDERSON MINE JAN 13 1992 <br />Box 68 <br />Empire, Colorado 80438 ill^^'' 1.^'ld <br />(303) 569-3221 c~.. - ~.. , ... <br />January 9, 1992 <br />Certified Mail No. P 682 083 220 <br />Mr. Gregg R. Squire, Reclamation Specialist <br />Mine Land Reclamation Division <br />Colorado Department of Natural Resources <br />1313 Sherman Street, Room 423 <br />Denver, Colorado 80203-2273 <br />Dear Gregg: <br />It was a pleasure to meet you and introduce you to 1.he <br />Henderson Mine and Mill during your December 20 inspection. I <br />have received your inspection report and appreciate your <br />timeliness. I am writing this letter as a follow up to cur <br />conversations regarding your concerns of fugitive dust emissions <br />from our Mill site. <br />As we discussed, the Henderson Mine and Mill was de:;igned <br />and constructed in the mid-1970's. From original design through <br />current day operations, there has been a commitment to <br />environmental excellence. During the design phase it wa:; <br />recognized that control of fugitive dust emissions was nEacessary. <br />The industrial area was paved as well as most mill roads. The <br />county road used for product transport was paved to prevent <br />fugitive dust. An ongoing program to analyze chemical <br />constituents of nearby soils and vegetation was started F~rior to <br />production to document any impacts should they occur. Disturbed <br />areas were minimized and, when possible, reclaimed as thE~y <br />occurred. These and other control measures have been successful <br />at reducing fugitive dust emissions. <br />Fugitive emissions from our tailings deposition are~i have <br />proven difficult to control for short periods in the spring and <br />fall as we discussed. The problem arises in the spring during <br />the period when the snow cover has melted and a very thin layer <br />of dry tailing material overlays saturated tailings. Similarly, <br />in the fall when the method of tailing deposition is switched <br />from `drips' to `lead-offs' to prevent the formation of ice <br />lenses in the tailing dam, there is a short period of time that <br />we are faced with a very thin dry layer of material overlaying <br />saturated tailing similar to "quicksand". <br /> <br />As this problem has developed there have been several <br />operational controls developed to minimize fugitive emissions. <br />The dust suppressant Coherex is regularly applied over th.e <br />