Density
There are four ways of passing Density values to the Grade Tonnage Report and Generate Material Bins functions:
- From the Density fields in the Input file
- From the Density attribute in the wireframe
- From a Density value in the Material set (if specified)
- From a Density value specified for void material
You must enter a Default density value. This will be used when a Density value is missing from a record or a wireframe attribute.
If a block model is the input, you have the option to enter a default density for the void.
Void represents regions where no block model cells intersect the wireframe(s) being interrogated. For example, void regions may be present when an Ore block model does not fully cover the extents of a pit that is being evaluated.
For this void region, the block model grades are scaled to encompass the whole volume, using the default grades as the void grades. When you run the function, the values for the block, and the void, are reported for each wireframe.
Note: Specifying a void density and configuring the void attribute settings is recommended when using an ore block model.
A few examples of the options available in the Density Fields group of the Output tab, are shown below:
In this example, the Density values will be obtained from the Density field in the Input file. The Default density will be substituted when a record does not contain a Density value. The Void density will be used to calculate the masses of any void material:
In this example, the function will obtain a Density value from the Input file. It will then write the average density of the records occurring in a wireframe to the Density attribute in the same wireframe. You must nominate the Density attribute. In this case Density values present in the Density attribute will be overwritten:
In this case the function will obtain a Density value from the wireframe in which the point or interval occurs. You must enter the name of the Density attribute for the wireframe object containing the value. The Default density will be used if a wireframe attribute does not contain a value:
