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Collom Area Geology Pre - Feasibility Report <br />the geological modeling system and incorporated into the geological reserve <br />model. <br />7.2 Drill Hole Database <br />The pre- existing lithology and coal quality data for Colowyo and Collom <br />previously resided in unsecured, invalidated spreadsheets. Prior to the 2004 <br />Exploration Program, the pre- existing lithology and coal quality data were <br />transferred to a new Microsoft Access database, called "DHDB ". All data <br />generated during the 2004 drilling program (and 2005 drilling program) were <br />entered into the geologic database. <br />The drill hole database is menu and form driven and provides extensive data <br />security and validation of the drill hole data. Three levels of password access <br />exist in the database. In addition, comprehensive, yet exclusive, data input <br />validation exists in the database. Thus, only approved seam codes and lithology <br />codes can be entered into the database. A copy of the database user guide <br />resides in Appendix F. <br />Checks on pre- existing coal seam data were made and results showed that coal <br />seam thickness data were consistent when checked against geophysical logs. <br />However, confidence of the coal picks and rock parting thickness deteriorates <br />with increasing age of the data, particularly for non -cored holes. Consequently, <br />some of the early drill holes, including USGS holes, are suspect but deemed still <br />useful at this stage. Following the standards set during the GEOCID project, only <br />data represented by a legible geophysical log and a reliable location datum was <br />utilized for modeling. <br />While reviewing existing coal quality (pre -2004) spreadsheets, prior to conversion <br />to the Access database, some anomalous data were found. The UII data in coal <br />quality spreadsheets contained a 3% moisture "correction" factor applied to the <br />August 2005 Page 26 of 38 <br />