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Technical Revision to <br />Henderson Mine Permit Ido. 77-342 <br />, Page 6 <br />12. Page 6-52, Air Monitoring, reads, "The program was <br />initiated in 1977 and the bugs are still being worked out of <br />the system." Please change it to read, "The program was <br />initiated in 1977 and generally operated on a six-day cycle <br />through 1982 when it was discontinued because of the adequacy <br />of data collected in terms of both quality and quantity." <br />Discussion: Interestingly, some of the highest <br />particulate readings obtained through the years were a <br />direct result of lodgepole pine pollination. Operation of <br />the high volume samplers can be reinitiated on very short <br />notice if necessary. <br />13. Section 8 of the original permit, Co-Sponsored Research, <br />is an overview of formal and informal revegetation research <br />which had been done at the Climax Mine and was in progress at <br />the Urad and Henderson Mines at the time of writing. <br />Significant and varied research has been conducted since that <br />time and some of it is ongoing. With the exception noted <br />below, discussions of the research were not intended as <br />commitments and should not be interpreted as commitments to <br />continue all research indefinitely. <br />Reference to the set of research test plots which was <br />intended as a commitment is near the top of Page 9-16. It <br />refers to plots to "ascertain the validity of the plan" to use <br />an average of one foot of soil to aid reclamation of the <br />Eenderson tailing area. Those plots were established in 1982, <br />were described in the most recent annual report, and are <br />showing good growth at present. Progress of the plots will be <br />discussed in future annual reports. <br />14. In 1976 and 1977, when the original permit application was <br />in preparation, AMAX committed to cover the tailing with an <br />average of one foot of soil salvaged from within the tailing <br />basin. Based on a soil survey by the U.S. Forest Service, it <br />appeared that adequate amounts of soil for this purpose would <br />~e available from the upper elevations of the tailing <br />9eposition area. However, not having verified the accuracy of <br />phis survey, APIAX conservatively committed to stockpiling, very <br />early in the life of the mine, all foil necessary to cover the <br />:final tailing area, i.e. 400,000 yd in 1978 and the remainder <br />wring 1982-84. During 1983, AMAX performed its own soil <br />survey and verified that the quantities and distribution of <br />soil are generally consistent with the U.S. Forest Service <br />survey. Consequently, it is not necessary nor economically <br />:esirable to stockpile all soil early in the life of the mine <br />and we wish to revise the stockpiling plan. This will allow us <br />:c pursue a more rational scheme of coordinating the rate of <br />=tockpiling with the rate of tailing deposition, thereby <br />