Processing
On the Processing tab of the Calculate Grade Tonnage (Block Model) form, select the element fields to be included in the estimation. You can also specify how the grades will be written to the wireframes.
Grade Fields
There are two ways of passing a grade to the Wireframe | Report | Grade Tonnage functions, for use in grade calculations:
- Using the Grade field in the input file
- Using the Grade attribute in the wireframe (described below)
Use Grade from Wireframe
Select this option to obtain a value from the grade attribute in the wireframes rather than from the fields in the input file. In this case, you must enter the name of the attribute in the Wireframe Attribute cell:
Grade Field
Double-click (or click on the Select icon) to select a field in the input file that will be used in the grade calculation.
You can select a field more than once provided that the Result Units for reporting are different.
Use the buttons on the local toolbar to Manage the rows in the list.
Default Grade
If a grade value is missing from a record, the function will use the Default grade. If you have not entered a Default grade, the function will substitute a value of 0.0.
Cut Value
Enter a Cut value. If the value in the Cut field is higher than the Cut value, the process uses the Cut value instead.
Write Final Weighted Grade to Wireframe
Select this check box if you wish to write the weighted grades to the wireframes.
Wireframe Grade Attribute
When the Use Grade From Wireframe option is selected, specify a new wireframe attribute, or select an existing attribute, to which the Weighted Final Grade will be written.
Overwrite Grade in Wireframe
When the Write Final Weighted Grade To Wireframe option is selected, select this option to overwrite any value already stored in the specified Wireframe Attribute. Existing grade values will not be overwritten unless this option is selected.
Grade Unit
When you select a Grade Unit a conversion to a Mineral unit can be performed. Mineral value is equal to the Grade field multiplied by volume (m3) or tonnage (t).
Wireframe Mineral Attribute
When the Write Final Weighted Grade To Wireframe option is selected, select this option to overwrite any value already stored in the specified Wireframe Mineral Attribute. Existing grade values will not be overwritten unless this option is selected.
Wireframe Mineral Unit
Select the Mineral unit (Tonnes, Ounces, Grams, Carats, Pounds, Pennyweights, Kilograms) that will be used to report the result calculated from the Grade unit.
Group Blocks With Key Fields
Select this check box to group the blocks based on one or more key fields in the input file.
Use the buttons on the local toolbar to Manage the rows in the list.
Group Blocks With Material Bins
Select this check box to group the blocks with material bins. For more information, see: Material Bin Set
Material bin set
Click on the Forms icon to select the name of a Material Bin Set.
The Material Bin Set input allows you to create a series of material bins that identify different material types in a block model. When a Material Bin Set is defined, quantities and qualities for each material type are reported. You can additionally create wireframe attributes for each calculated field corresponding to the properties of a material bin, and write them to the wireframes.
More information on Material Bin Sets (including how a set is prepared) can be found under Wireframe | Report | Material Bins > Material Bin Set.