Drillhole
The Drillhole tools and functions on the Drillhole tab, allow you to:
- Check the integrity of a Drillhole Database.
- Calculate the coordinates of each sample centre in an Interval file.
- Calculate three dimensional coordinates for samples at regular intervals along straight lines.
- Validate Trench Survey and Assay data to create a Trench Control file.
- Create a Trace coordinate file that is used to control the display of holes in plan and section.
- Display annotated drillhole logs and display information on sections orthogonal to the grid (i.e. along either a North or East line) and in Plan view.
- Create a MineSight file by combining collar and Interval files. If the holes have been surveyed, data from a Survey file can also be included in the process.
- Import values from a MineSight spearing file and write them to an interval file. The function requires a MineSight spearing file containing hole identifiers, depths and codes. Hole identifiers are used as the key field in the import process.
Quick Log
Drillhole information (assay values, histograms, colour and hatch coded lithology, etc.) for the holes you have selected for inclusion in a drillhole log can now be displayed against a vertical depth scalebar in Vizex. You can overlay related columns and interactively calculate average grades for intersection intervals.
Advanced Functions
The application can perform a wide variety of drillhole-related calculations. For example: numeric extractions on various fields, calculating true thickness, true dip and dip direction, intersections and seam thickness, and plane of vein conversions.
The coordinates of the trace, interval mid points, and upper and lower surfaces can be generated.
Regular or irregular sample intervals can be composited by downhole, bench (elevation), Easting or Northing interval. Additionally, a constant field (typically Lithology) can be specified to force a new composite whenever the value in the field changes.
It is also possible to use the values in a grade field to determine the compositing rules. A set of conditions can be specified to determine exactly how this will occur, with control over the cutoff grade, the amount and nature of internal waste, and minimum composite length.
Log Intersections
The Log Intersections function can be used to display individual holes and calculate average values for different intersection boundaries. You can also display any combination of data values, hatch patterns and graphs.
The holes are displayed as vertical logs uncorrected for hole deviation. You can use the intersection calculation to calculate and display average grades (compositing) for up to six fields. Because the display is interactive, you can see the effect of different intersection boundaries on average values as you change the intersection boundaries. This gives you precision control over intervals.
You can also write the average grades and a code to a separate file and/or to the input file containing the original assay data. The codes can be used to classify intersections. The intersection intervals can also be written to a field in the original data file.
Any number of intersections may be calculated for each hole. Before you can calculate average values, you must define the fields containing assays in the input file.
The collar information is shown only if the top of the hole is displayed. If a section of a hole is displayed a yellow triangle appears at the top and bottom of the extreme left hand side of the screen, indicating data exists above and below the current display.
Strip Log
The Log > Strip Log function is used to display single holes as vertical strip logs uncorrected for hole deviation. In addition to Value (Label), Event, and Hatch displays, you can include up to 10 graphical logs of any numeric field. Each drillhole is displayed individually.
In addition to the Collar file, each file in the display must have a hole identifier, FROM/TO values, and some value to display. Only numeric fields may be displayed as Graphs. The data can come from different files and the FROM/TO values in these files can be different.