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ENERGY FUELS COAL, INC. <br />SOUTHFIELD MINE <br />SEMI-ANNUAL SUBSIDENCE MONITORING REPORT <br />(MAY, 1989 THROUGH OCTOBER, 1989) <br />INTRODUCTION <br />Enclosed with this repoct is tabulated survey monument and <br />structure location orientation data for the above period of <br />record. In addition, survey data for the high-resolution <br />monument grid is presented graphically, is cross section form. <br />The mine was in full production during this period, although no <br />mining occured in the areas monitored by the subsidence surveys. <br />SUMMARY <br />Survey data Eor the Thompson Ranch Structures and Newlin <br />Creek Point show no measurable subsidence for the peciod of <br />record of this report. In addition, the data indicates only <br />minor additional subsidence occurring at the Florence water line <br />monument locations. <br />Survey data for the South subsidence monument grid indicates <br />only minor additional subsidence occurring during the period of <br />record. The apparent angle of draw and maximum subsidence <br />compares favorably with the subsidence predictions contained in <br />the permit application. A review of the survey data for each <br />monument and structure is presented below. <br />THOMPSON RANCH STRUCTURES <br />Survey data pertaining to the three (3) Thompson Ranch <br />structures is summarized on Table 3, Subsidence Monitoring Data <br />Summary. No subsidence was measured at any of the structures, <br />which is consistent with previous survey data to date. Only <br />minor subsidence is predicted to occur in the area of the <br />structures until such time that retreat mining is done at this <br />location. <br />NEWLIN CREEK POINT <br />Survey data pertaining to the Newlin Creek Point is <br />summarized on Table 3, Subsidence Monitoring Data Summary. No <br />additional subsidence was detected at this point for the period <br />of record. The data suggests that the creek channel area at this <br />location continues to be stable. Minor additional subsidence is <br />anticipated to occur at this location. <br />