2010-12-17_REVISION - C1981019 (115)

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• o CCC will need to document the reasons for discrepancies noted in recent C- 04 series holes between the original 'from ply on the laboratory sheets when compared to the database print out. • Status: Complete. Field depths of each sample are listed on laboratory sample instruction sheets. Upon receipt of laboratory results, the depths and ply numbers are checked against the sample instruction sheet. Upon entry into the database, the sample depths are adjusted to match depth adjustments of lithological data. The protocol for entering data into the database is located in Appendix 2 of this memorandum. • It should be noted that the database contains both unadjusted and adjusted sample depths. The "Sample Definition Summary" report in the drill hole database includes the unadjusted and the adjusted sample depths. • Databases — General: o A significant number of holes drilled in the mined out areas of East Pit have been omitted from the database. Should time allow these could be eventually added to the database. • o Status: Incomplete /Low Priority. The drill hole database contains approximately 1,483 drill hole locations. Approximately 718 of these holes are currently utilized in the geological model. Approximately 429 of the 665 excluded from the model do not have lithological information in the database. Approximately 225 holes have lithological data but are not modelled. Also, approximately 13 monitor wells or piezometers have not been modelled. o It should be noted that an extremely thorough review of the available drill hole data during the 1995 GEOCID project. At that time each drill hole was reviewed to determine its validity for inclusion in geological modelling. Those drill holes without well documented location data and reliable geophysical logs were. flagged and excluded from geological modeling. This accounts for nearly all of the drill holes without lithological data in the database. o In addition, many of the mined out drill holes have been flagged as mined out for quite some time. These data, while being useful for statistical analysis, provide little direct value to geological models and mine planning because other data buffer the influences of these points. Therefore, over time these data have not been reviewed during major recorrelation efforts. As a result, entering the mined out data into the database would require significant effort. Also, the value added from • these data is less than value added by collecting new data and