2009-02-17_REPORT - M1974004 (2)

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3.0 Data Collection ' 3.1 Discontinuity Measurements Structural geologic data collected for this evaluation included the measurement of orientation (strike and dip) of the geologic discontinuities from the newly exposed rock faces in the quarry, descriptions of the character of the discontinuities and data point ' locations (taken relative to generally measured wall locations). Measurements were taken from the faces of advancing benches in both the southern expansion area, and in the main pit of the quarry. A handheld GPS was used to obtain wall location information and to identify where the structural data were collected from. Discontinuity measurements were obtained utilizing a Brunton compass both indirectly by sighting along the discontinuity surface; and where deemed safe, by direct measurement on the discontinuity surface. Field inspection and data collection t occurred quarterly starting in August of 2008 and completing in January of 2009 and did ' not interfere with normal production mining activities. ' A total of 21 discontinuity measurements were collected and added to the measurements from previous years. When combined with data collected from previous ' annual reports (1997-2002, 2004-2008) and with borehole geophysical data collected during the 2003 geotechnical investigation, a total of 3053 strike and dip measurements of discontinuities in the quarry have been obtained over the past 11 years. Figure 4 is a stereographic contour plot of all of the data collected since 1997. 1 Mining activity has occurred in the main pit since the last report and additional data ' points during this study were collected from this area (Photo 5). Two exposures were accessible during our site visits; a generally west facing temporary wall as well as an ' east facing wall (Figure 2, Stations 1 & 2). Access to the remainder of the middle bench excavation for data collection was not possible due to continued excavation of materials by trucks during our visits. 1 -5-