Compute Grade x Thickness Statistics for I-Data Grade Values

RockWorks | Borehole Operations | I-Data | GT Compositing

This program reads a column of I-Data that represents grade values (e.g. eUranium) and computes a variety of GT (grade x thickness) statistical information based on user-defined minimum grade and maximum waste-thickness cutoff values.

The output from this program may be stored within an Excel-compatible CSV file, I-Data columns, or a special XYZ file that may be used for subsequent point-mapping and/or contouring.

Feature Level: RockWorks Standard and higher

Menu Options
Step-by-Step Summary

I-Data Track: Click to the right to select the I-Data track that contains the grade data. For example, this might represent %eU3O8 (Uranium Grade Equivalent), ounces per ton Gold, etc.
Compositing
- Cutoffs: This are the primary filtering values that are used to determine the extents of the ore intercepts.
  - Minimum Acceptable Grade: Click here to enter the minimum value in the Input track to be considered. This value determines what is considered "acceptable" ore.
  - Maximum Acceptable Grade: Enter the maximum value in the Input track to be considered. To include all values above the minimum, just type in a large number, such as "9999".
  - Maximum Acceptable Cumulative Waste Thickness: This value defines the amount of waste, or "interburden" that is acceptable for zones that are bounded, above and below, by intervals that contain material that have "acceptable" grade values.
- Depth Filtering: If checked, this setting will cause the program to only process data that is between the specified minimum depth and the specified maximum depth. We specifically avoid the terms "above" or "below" because the borehole may be inclined upwards (e.g. an underground exploration hole drilled upwards).
  - Minimum Depth: Sample intervals between the collar and this depth will be ignored.
  - Maximum Depth: Sample intervals between this depth and the total depth (TD) of the hole (TD) will be ignored.
- Elevation Filtering: If checked, the program will ignore all sample intervals above the maximum elevation or below the minimum elevation.
  - Minimum Elevation: Sample intervals below this elevation will be ignored by the program.
  - Maximum Elevation: Sample intervals above this elevation will be ignored by the program.
Apply to: This program may be used to compute GT-related values for just the currently-highlighted borehole, all enabled holes, or all of the boreholes.
- All Boreholes (Enabled and Disabled): Compute GT-related values for all of the boreholes in the project database, regardless of whether they are enabled (with check-marks next to their names in the Borehole Manager) or not.
- Only Enabled Boreholes: Compute GT-related values for all of the enabled boreholes. Boreholes which are not checked will not be included.
- Currently Highlighted Borehole (Single Borehole): Compute GT-related values only for the currently "active" borehole.
  - Current Borehole Name: The name displayed here is the active borehole in the database. You can choose the name of a different borehole for processing.
Save as I-Data: Check this item if you want to export the output from this program into tracks (columns) within the I-Data table as shown by the following example.

! You can define the I-Data output columns before this program is used. Or you can click on the button to the right to display the I-Data Types Table where you can add new columns.
- Thickness: Check this box if you want to store the intercept thicknesses.
  (The intercept is a zone of contiguous material that meets the criteria defined by the minimum acceptable grade and the maximum acceptable waste thickness, defined below.)
  - Track: Click to select the I-Data column in which the Thickness computations should be stored.
- Average Grade: Check this box if you want to store the average grade for all sample intervals within the associated intercept.
  - Track: Click to select the I-Data column in which the Average Grade computation should be stored.
- Sum of Grade x Thickness: Check this box if you want to store the sum of all grades multiplied by the thicknesses for each sample interval within the associated intercept.
  - Track: Click to select the I-Data column in which the Sum of Grade x Thickness computations should be stored.
- Minimum Original Grade: Check this box if you want to store the minimum grade value for all of the sample intervals within the associated intercept.
  - Track: I-Data column in which the Minimum Original Grade values are to be stored.
- Maximum Original Grade: Check this box if you want to store the maximum grade value for all of the sample intervals within the associated intercept.
  - Track: Click to select the I-Data column in which the Maximum Original Grade values should be stored.
- Depth to Maximum Grade: Check this box if you want to store the depth to the maximum grade value for all of the sample intervals within the associated intercept.
  - Track: Click to select the I-Data column in which the Depth to Maximum Grade values should be stored.
Create Report: Check this box to create an output report.
- Report Type: Click here to select the report style.
  - Interval List: Choose this option for the output report to be saved within a Excel-compatible CSV (Comma Separated Values) file as shown by the following example.
  - XYZ List: Choose this option for the program to save an XYZ point within the designated file for each borehole. The x-coordinate will contain the easting for the borehole collar, the y-coordinate will contain the northing for the borehole collar, and the z-value will represent the total for all "sum of grade x thickness" values for that particular borehole.
    - This data is intended for plotting borehole location maps in which the point label represents a summary to the borehole's economic value. These values may also be contoured, but (and this is important), inclined boreholes will produce misleading contour maps since the xy location for each point always corresponds with collar location. Please note that creating an XYZ file only makes sense if you're processing all of the borehole (see "Apply to" option below).
  - Z-Decimals: Number of decimal places to use when saving the z-value (sum of GT values). This setting is useful if the XYZ file is to be used for creating a two-dimensional map as shown below.
- Output Options
  Click this tab to define the output format(s) for the report. (More info)
  - RwDat (RockWorks): Click in this button if you want the report generated in a RockWorks datasheet (.RwDat) format.
  - CSV (Excel): Click in this button if you want the report generated in a CSV file format for use in Excel.
  - TXT (Notepad): Click in this button if you want the report generated in a text (.txt) format.
  - RTF (Word): Click in this button if you want the report generated in an RTF file format for use in Word.

Access the RockWorks Borehole Manager program tab.
If you'll be recording the computations to the I-Data table in the database, be sure you've defined these columns in the I-Data Types table.
Select the Borehole Operations | I-Data | GT Compositing menu option.
Establish the desired program settings, as discussed above.
Click the Continue button to proceed with the computations.

The program will read the contents of the input I-Data track, determine for each borehole the areas where the minimum grade and maximum waste parameters are met, and determine the thickness of those zones or intercepts.

The program will record the computations in the requested output reports: Excel CSV and/or I-Data columns and/or XYZ file (you can choose as many of the output options as you like).

Here is an example of how the Sum GT, Average Grade, and Maximum Original Grade computations recorded in the I-Data table could be plotted with the original grade data in a striplog.

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