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Technical Revision to <br />Henderson Mine Permit Igo. 77-342 <br />Page 2 <br />the life of the mine, and that ultimate reclamation sche~9ules <br />will commence at mine closure which may or may not be th~~ ;year <br />2006. <br />2. All changes in technique or procedure which have been <br />implemented since submission of the original application are <br />not listed in this TR. Changes implemented prior to thi:> TR <br />were communicated earlier in previous Technical Revisions, the <br />Amendment, or Annual Reports, and should be incorporated herein <br />by reference. <br />3. Our address, item 4 on the amendment permit application <br />form, has changed from 13949 West Colfax to 1707 Cole <br />Boulevard. The city and zip code remain the same. <br />4. Page 2-7, original permit, States, "All water used to <br />transport the tailing is decanted from the surface and returned <br />to the mill for reuse via a completely closed-loop industrial <br />water circuit." Please change to read, "Normally, all water <br />used to transport tailing is decanted from the surface ar~d <br />returned to the mill for reuse via a completely closed-loop <br />industrial water circuit", and add the following sentence. "If <br />or when discharge of water is required, it will be done in <br />compliance with all applicable rules and regulations of the <br />Colorado Department of E3ealth". <br />Discussion: During the spring of 1983, discharge at the <br />mill site was necessitated because of the combined <br />circumstances of excessive runoff and less water consumed <br />in operations due to production cutbacks. This was the <br />first such occurrence since production eras initiated in <br />1976. Similar circumstances may occur in the future and <br />we require the flexibility to respond to those situations. <br />Also, Page 6-35, the last two lines, and Page 6-36, the <br />top two lines, original permit, state, "tdo discharge permit for <br />the mill site is necessary. The entire milling operation, <br />requiring the circulation of millions of gallons of water each <br />day, is a closed-loop (recycle) industrial water circuit." <br />Please change to read, "Under normal operations and precluding <br />extreme climatological conditions, no discharge from the mill <br />site is necessary. The entire milling operation, requiring the <br />circulation of millions of gallons of water each day, is <br />designed as a closed-loop (recycle) industrial water circuit. <br />However, to accommodate the contingency of abnormal operating <br />and climatological conditions, a discharge location at the mill <br />site is being identified in the I7PDES permit." <br />