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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />4.0 Data CoNection <br />Discontinuity Measurements <br />For the current (2005) geological structural evaluation of the quarry, LF&A <br />collected 146 discontinuity measurements to add to the existing structural <br />geology database. Data collected for this evaluation includes the measurement <br />of strike and dip of the geologic discontinuities from the exposed rock faces in <br />the quarry, descriptions of the character of the discontinuities, and all of the data <br />collection point descriptions taken relative to generally measured wall locations. <br />Measurements were taken from the faces of advancing benches in both the <br />southern expansion area, and.on.the middle level of the quarry. Although some .. <br />mining activity has occurred in the main pit, no additional data points were <br />collected for this study due to the activity on the middle level creating an unsafe <br />environment to work below. Figure 2 shows the approximate locations of the <br />exposed walls and the temporary station numbers where discontinuity <br />measurements were collected for this study. <br />Discontinuity measurements were obtained utilizing a Brunton compass both <br />indirectly by sighting along the discontinuity surface; and where deemed safe, by <br />direct measurement on the discontinuity surface. Data were collected on March <br />19 and 28, 2005 and did not interfere with normal production mining activities. <br />A total of 146 discontinuity measurements were collected and added to the <br />measurements from previous years. When combined with data collected from <br />' previous annual reports (1997-2002 and 2004} and with borehole geophysical <br />' data collected during the 2003 geotechnical investigation, a total of 2,863 strike <br />and dip measurements of discontinuities in the quarry have been obtained. <br />' Figure 4 is a stereographic plot of all of the data poles representing structural <br />' features. The asterisk and plus sign shaped symbols represent the data <br />collected during this study. The triangle and square shaped symbols represent <br />' the data collected for the 2004 report; while the circles represent the borehole <br />7 <br />