2010-12-17_REVISION - C1981019 (130)

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�7- Table 2 -1: Drill Holes Selected for Checking Original Data against the Database Drill Hole ID Hard Copy in Cabinet Comments 10 -14 -S2 26 No quality data in file. Thickness data only 11 -14 -S9 213 Original coal quality available. Not in DB — in mined out area of pit 88 -16 -08 2C Original coal quality available UL -95 -04 3A Original coal quality available UL -95 -04 3A Original coal quality available WP -00 -04 313 Original coal quality available WP- 00 -04A 3B Rotary hole DH -110 3C No coal quality data in file DH -155 3C No coal quality data in file DF -56 1A In close proximity to C -04 -24 C -04 -20 4C Original coal quality available. E -log and drillers log depths inconsistent C -04 -24 4C Original coal quality available. E -log and drillers log depths inconsistent C -04 -30 4C Rotary hole C -04 -36 4C Original coal quality available. I seam mis- labelled. E -log and drillers log depths inconsistent In the recent C -04 series TS noted a number of inconsistencies between the original 'from ply on the laboratory sheets when compared to the database print out. CCC explained that the 'from _to' data were adjusted in the database to match the depths in the downhole e� -logs. CCC felt that the e -logs gave a more precise depth than the driller's log. TS was concerned to note that discrepancies increased from ±1 ft near to surface to ±6 ft at the bottom of some deeper holes. CCC will need to document the reasons for these discrepancies. 3 ACCESS DATABASE - OVERVIEW Database integrity (both in terms of data validity and data reliability) is essential at any operation. With large databases it is usual to have one person appointed as a Database Manager who has overall responsibility for maintaining and updating the database(s). Generally, other users are only allowed database read access. RIO TINTO BR3273: FINAL Version: 1 2 T c:d `-„i«5