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REPORT SUMMARY <br />1 INTRODUCTION <br />At the request of Mr Juan Garcia, Colowyo Coal Corporation (CCC), the author visited the <br />CCC's mine during the period 14 -24 March 2005, in order to review the status of the Collom <br />geological database and associated geological data. Specific items that were identified for <br />review included the following: <br />• Diamond Drilling — Check the reliability and accuracy of the data transferred into the <br />new Access database. <br />QA /QC Procedures for the above — Review the QA/QC procedures for data <br />capture /entry in the above databases. <br />• Geological Model — Briefly review the MineScape geological models and comment <br />on suitability for resource estimation. <br />The author would like to thank the personnel at CCC for the assistance given, especially by <br />Bob Young, Alan Jorgenson, Juan Garcia, Alex Papp, Dwight Kinnes and Brant Dennis, in <br />helping to complete this review. <br />Data review and validation were mainly undertaken using Microsoft Excel. <br />• 2 `ORIGINAL DATA' STORAGE <br />As part of the data review it was necessary to refer to the original drilling data. Storage of <br />this information is currently adequate, both in terms of location and security. This type of <br />information (including drilling logs, analytical data, interpretations, etc) is the foundation for <br />any geological model. These data are safely and logically stored in fire retardant cabinets on <br />the basement floor in the Lower Administration Building. <br />A series of NN holes (Table 2.1) were selected at random from a plan of the drill hole <br />locations. CCC provided a printout of the lithology and coal qualities on a seam -by -seam <br />basis of both ply and composite data, for these holes. The original data for each of these <br />holes were extracted from the fire retardant cabinets. Header and lithology data in the print <br />outs were checked against the original data in the 'hard copy' file. No errors were noted. <br />0 <br />RIO <br />TINTO <br />BR3273: FINAL Version: 1 <br />