Whereas the lith logger is interested in the detail of the rock, sometimes down to millimetre scale, the geotech logger is interested in identifying rock mass units that have similar geotechnical properties and describing the features that characterise a particular RMU. That will include an assessment of intact rock strength (not as easy as it sounds) and, identification and description of defects. The geotechnical logger will also sample core for laboratory testing taking particular care to select samples of critical defects and preserving the moisture content of the sample, often under difficult conditions.
Paul Maconochie has been a participant in the ACARP CoalLog project that has produced a standard dictionary for the Australian coal industry. We are flexible in the software we use to produce or final logs and currently use Strater for its flexibility. CoalLog is available from this AusIMM site
If you need a general guideline for geotechnical logging feel free to download our own Rock Core Logging for Engineering Purposes.
GTS has mapped the whole of the Ok Tedi pit using Sirovision, and regularly uses the technology throughout the Bowen and Sydney Basins