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Exhibit K- Henderson Mine and Mill Permit Amendment <br /> CLIMATE and AIR QUALITY <br /> Climate <br /> Climate at the Henderson Mill site and along the conveyor route is typical of the high <br /> mountain areas along the Continental Divide. At an elevation in excess of 9000 feet <br /> msl, winters are long and cold with heavy snowfall, and summers are short and cool. <br /> Temperatures exhibit large diurnal fluctuations. Winds vary widely due to rugged <br /> topographic variations. Meteorological data collected at the Mill in early 1997 indicate <br /> that predominant wind directions are north-northwesterly and south-southeasterly; <br /> consistent with expected mountain flow patterns in valleys such as the Williams Fork <br /> Valley. <br /> The average temperatures for January through March, 1997 at the Mill were 20, 19, <br /> and 30 degrees Fahrenheit, respectively. This compares with the 61 year average for <br /> the same months at the Dillon East site (one mile east of Dillon, Colorado) of 15.5, <br /> 18.1, and 23.5 degrees Fahrenheit, respectively. <br /> Since 1988, snow depth records have been maintained at the Mill. The average snow <br /> depth during this period is 41.1 inches. The peak snow depth recorded during the <br /> winter of 1996-1997 was 50.4 inches. <br /> Air Quality <br /> The Williams Fork Valley and the Henderson Mill area, in particular, is designated by <br /> the Colorado Department of Public Health and Environment (CDPHE) as an attainment <br /> area for all state and federal air quality standards (AQS). <br /> • <br />