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<br />Energy Fuels Coal, Inc. <br />Southfield Mine <br />SEMI-ANNUAL SUBSIDENCE MONITORING REPORT <br />(Period: January 1, 1997 -June 30, 1997) <br />INTRODUCTION <br />The semi-annual subsidence monitoring report compares field survey monitoring data to permit <br />predictions for inventoried structures. Summarized survey data are shown in attached Table 1, <br />Semi-Annual Subsidence Monitoring Data. These data show location and orientation of <br />monuments and structures for the reporting period. Additionally, original survey data for aU <br />subsidence monitoring locations are shown on attached Table 2, Original Subsidence Monument <br />Data. <br />EFCI performed two quarterly surveys of the subsidence monuments and structures shown on <br />Table 1 during the reporting period. Discussion of the subsidence data, and any current visual <br />observation information, is shown below. <br />DISCUSSION <br />Structures monitored quarterly for subsidence include the Thompson Ranch buildings, the <br />Florence City water line, and the Newlin Creek point. Summarized survey data for these <br />structures are shown on accompanying Table 1, Semi-Annual Subsidence Monitoring Data <br />Summary. Location of the structures and monuments with respect to the Mine layout aze shown <br />on Map 17 in the permit application. Discussion of survey monitoring data compared to permit <br />predictions for inventoried structures follows below. <br />1.1 Thomoson Ranch Structures <br />Survey data for the final quarter of the reporting period indicate that subsidence in the range of <br />(+)0.01 to (+x.06 feet has occurred. These data are similar to previous reporting periods, and <br />indicate that no subsidence is occurring in the area of the ranch structures. No mining has <br />occurred below the ranch area that would cause subsidence. <br />1_.2 Newlin Creek Point <br />Survey data for the Newlin Creek point show no additional subsidence through the second quarter <br />of 1997. These data agree with preceding monitoring periods. No mining operations have <br />occurred in the vicinity of this survey point since 1982 to cause additional subsidence. <br />1.3 Florence Water Line <br />Survey data obtained at the eight monuments along the Florence Water Line indicate minor <br />subsidence occurring only at Monuments F, G,and I during the reporting period. The amount of <br />measured subsidence at these monuments ranged from 0.05 to 0.17 feet. Only minor subsidence <br />of less than 0.05 feet was measured at the remaining siz monitoring locations. No recent mining <br />has been done in the vicinity of monitoring locations that would cause additional subsidence. <br />