Computing Block Model Grade Statistics by Level

RockWorks | Utilities | Volumetrics |
Block Model Grade Statistics by Level

This program reads an existing solid model (.RwMod file) and creates a report which summarizes concentrations by elevation level. You can specify one or more concentration levels. You can request a variety of statistics in the output report, as well request summaries for each level in the model or a user-defined elevation range. This utility is primarily designed for users who are evaluating the ore within a solid model on a level-by-level basis (i.e. mine planning). Typically, the solid model will have already been clipped with an extraction surface (Volumetrics | Extract Solid) or filtered to remove irrelevant nodes.

! This program requires that a solid model containing grade values already exists (Solid | Model, I-Data | Model, etc.)

Menu Options
Step-by-Step Summary
 

Menu Options

• Solid Model File: Click to the right to browse for the name of the existing solid model (.RwMod file) that the program is to analyze.
• Cutoff Levels:
  • Single: If you're only interested in a single range, select this option to avoid the hassle of creating an .RwDat file (see next item).
    • Title: Click here to enter the title for the value range, which will appear as a column heading at the top of the output report. (Example: Ore: 3.5 -4.5)
    • Minimum G Value: Click to the right to type in the minimum grade value you wish to report.
    • Maximum G Value: Click to type in the maximum grade value you wish to report.
    • Density: Click to the right to type in the density value for this grade range, to be used to compute mass (if requested). If this is not known, enter "1" and uncheck the Mass option, below.
      
  • Multiple: If you're interested in the volumetrics for multiple ranges of g-values, create a new datasheet with the interval information (see below) and then specify the appropriate columns within the sub-items for this option.
    • Title Column: Click to the right to select the name of the column in the datasheet where the titles for the value ranges are listed. These will appear as a column heading at the top of the output report.
    • Minimum Column: Click to the right to select the name of the column in the datasheet where the minimum grade values for each range are listed.
    • Maximum Column: Click to to select the name of the column in the datasheet where the maximum grade values for each range are listed.
    • Density Column: Click to select the name of the column in the datasheet where the density values for each grade range are listed. These will be used to compute mass (if requested). If this is not known, enter "1" and uncheck the Mass option, below.
      
      
• Items To Be Computed For Each Level: A variety of statistical items may be computed by this program. Insert a check in those that you want to include in the output report.
  
  
• Unit Annotation:
  • Minimum/Maximum/Average Grade: Click to the right to type in the notation for the minimum, maximum, and/or average grade calculations (if activated). The other units are defined in the program's Output Dimensions, at the bottom of the main program window.
    
    
• Intervals: Expand this heading to select the output intervals for the report:
  • Every Layer: Choose this if the report is to list calculations for every node layer in the solid model.
  • User-Defined: Choose this option if you prefer to enter a different report interval.
    • Top Elevation: Click to the right to type in the uppermost elevation in the solid model to be analyzed for the report.
    • Base Elevation: Click to type in the lowermost elevation in the solid model to be analyzed for the report.
    • Interval: Enter into this prompt the elevation interval, within the base-to-top range to be analyzed.

Step-by-Step Summary

1. Access the Utilities program tab. 
2. If you will be analyzing multiple grade levels, open or create the datasheet where these levels are listed. Here's an example of how this might look:

If you will be analyzing only one grade interval, you don't need to enter this information into the datasheet.

3. Select the Volumetrics | Block Model Grade Statistics by Level menu option. 
4. Enter the requested menu settings, described above. 
5. Click the Process button at the bottom of the window to proceed.
   The program will read the input solid model and determine those voxels whose Grade values fall within the defined range(s) for each requested level. It will summarize the requested computations in the output report, which will be listed in a datasheet tab to the right.
   
   Notes: The minimum, maximum, and average values are not totaled, and are not computed for undefined (null) nodes.
   
6. You can adjust any of the settings in the Options window and then click the Process button again to regenerate the report.
   ! Each time you click the Process button, the existing report will be replaced.
    
7. Use the File | Save menu option at the top of the datasheet tab to save the report as an .RwDat file, for later retrieval into the main program datasheet.
   
   

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