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<br />3.1 CLIMATOLOGY <br />• <br />Mine Site <br />Climatological data of the Henderson mine site was collected <br />by the U.S. Weather Bureau at the Jones Pass weather station between <br />1963 and 1973. The station is located on the perimeter of the mine <br />yard at an elevation of 10,324 feet. Ongoing data is collected by <br />Company personnel. <br />Data for 7 of the past 12 years shows the mean annual <br />temperature to be 32.0°F with maximum and minimum temperatures of 77°F <br />and -32°F respectively. Approximately 45 to 60 consecutive frost-free <br />days occur each summer. Total precipitation has varied from 17.5 to <br />36.6 inches, averaging 24.6 inches, most of it occurring in the form <br />of snow. No wind velocity data is available; however, it is estimated <br />• that maximum gusts might reach as high as 70 to 80 mph. Table 3.1 <br />shows monthly climatological data for 1976. <br />Mill Site <br />The elevation at the mill site varies from about 8,400 to <br />9,400 feet. Climatological data has been collected by AMAX at up to <br />three locations since 1968. Maximum and minimum recorded temperatures <br />have been 88°F and -42°F respectively (with a yearly mean of 33.3°F). <br />Frost commonly occurs at least once each month -- even during the <br />summer months. Total precipitation averages about 25 inches per year. <br />About 170 inches of snowfall account for most of the annual precipi- <br />tation. Table 3.2 summarizes yearly mill site climatological data <br />from 1969 through 1973. <br />A program to monitor wind velocity and direction began in <br />3-5 <br />