Validation Report
Use the Options tab of the Drillhole Validation form to apply more extensive checks to your data:
File
Enter or double-click (F3) to select the name of a Report file, then select from the following options:
Options
Check for missing intervals
Select this option if you want to:
- Check that the first FROM value in the Interval file = 0
- Check that the sample intervals are continuous in the Interval file
Allow zero length intervals
Select this option to allow zero length intervals. This may be a requirement during seam modelling, for example, when the thickness of a seam 'pinches' to zero.
Check for holes missing from ...
A check is always made that the holes defined in a Survey file, Interval file or Event file are also defined in the Collar file.
If enabled, the "Check for holes missing from" check box options will also check that holes in the Collar file are present in the Survey/Interval/Event file. Vertical holes, or holes with a single survey at the collar, do not need to be in the Survey file.
Check collar locations
Select this check box to check the locations of all collars as part of the validation.
Check deviation in 3D
Note that the Check deviation in 3D and Check inclination and azimuth options are mutually exclusive since they provide different ways to achieve the same outcome. When choosing between them, bear in mind that the Check inclinations and Check azimuths options are less sophisticated than the Check maximum deviation option, in terms of handling sub-vertical holes and variable survey spacings.
Select the Check maximum deviation option, to set a maximum allowable deviation (rate of change) in degrees per metre.
Check inclination and azimuth
Enabling Check inclinations also enables the Valid inclination change option. It applies the same checks to the consecutive inclination fields in the Survey file. If downhole surveys are closely spaced, a significant variation may indicate that an error has been made with one of the survey entries. Select Check inclinations then enter a valid inclination change in degrees.
Enabling Check apparent azimuths enables the Valid azimuth change option. It applies the same checks to the consecutive azimuth fields in the Survey file. Select Check apparent azimuths then enter a valid azimuth change in degrees.
A "Different Collar/Survey orientations" warning will be displayed if the collar orientation in the Collar file is different from the collar orientation in the Survey file.
A typical scenario might be when the geologist assigns a default collar orientation to the hole during drilling, but doesn't update the Collar file when the survey data is received. In this situation, the application will display the warning and only use the Survey file orientation.
Check sample interval lengths
Select the Check sample interval lengths option to check intervals against a specified maximum length and (optionally) ignore any sample intervals that don't have a value for the specified Grade field (See Allow zero length intervals above).
Valid inclination change
Select the Check inclinations option to set the magnitude of a Valid inclination change. Five degrees (5°) is usually an appropriate value. You will not be able to make an entry until you have selected the Check inclinations check box.
Valid apparent azimuth change
Select the Check apparent azimuths option to set the magnitude of a Valid azimuth change.
For a horizontal hole, the full value of the azimuth change is apparent. When a hole is vertical, the apparent azimuth change is always zero.
The dip is used to rescale the azimuth change to take into account the steepness of the hole.
Five degrees (5°) is usually an appropriate value. You will not be able to make an entry until you have selected the Check apparent azimuths check box.
Max 3D deviation
Select the Check deviation in 3D option, to set a maximum allowable deviation (rate of change) in degrees per metre. A good way to figure this out is to imagine how far you would allow a 100 m drillhole to deviate. If you would allow it to deviate by 5° then the max 3D deviation would be 5 divided by 100, or 0.05.
Max interval length (and Grade field)
Select the Check sample interval lengths option to check intervals against a specified maximum length and (optionally) ignore any sample intervals that don't have a value for the specified Grade field.
Forms
Click the Forms button to select and open a saved form set, or if a form set has been loaded, save the current form set.
OK
Click OK button to run the Validation process.