Dilution and reduction

• Selected: Incorporates a volume adjustment factor so that you can use different widths for dilution and reduction for the contact. The volume factor for an interval is the original volume of the layer less any reduction, plus any dilution divided by the original volume of the interval.
• Cleared: Does not incorporate a volume factor.

The name for the attribute in which to store the volume factor.

The dilution thickness for the top and bottom of the column or the ore layer. These amounts of material will be added to the column. If no blocks exist in these thicknesses above and below the column, a grade of 0.0 is assumed.

The reduction thickness for the top and bottom of the column or the ore layer. These amounts of material will be removed from the column.

The numeric attribute to dilute. The first attribute in this list is the master attribute whose value relative to the cutoff will determine possible ORE and WASTE reclassifications.

The existing attribute in which to store the diluted grade. The attribute must have a type of real.

The dilution grade is calculated as follows:

Diluted grade = ([Grade of interval * length of interval] - [Grade of reduction interval * length of reduction interval] + [grade of dilution interval * length of dilution interval]) / (length of interval - length of reduction interval + length of dilution interval)

When Surpac calculates the diluted grade, all negative grades (that is, all negative values for the attribute defined in the Attribute field) are replaced with this value. The default value is 0.0.

The name of the attribute that stores the ORE and WASTE flags.

The value that will signify ORE blocks. This value must conform in type to the ore attribute.

The value that will signify WASTE blocks. This value must conform in type to the ore attribute.

The direction that will define the orientation of columns in the model. This may be X, Y, Z -X, -Y or -Z. The directions that you can use include:

• -X, the columns are horizontal and aligned with the X axis of the block model and are processed in order of maximum X to minimum X value.
• X, the columns are horizontal and aligned with the X axis of the block model and are processed in order of minimum X to maximum X value.
• -Y, the columns are horizontal and aligned with the block model Y axis and are processed in order of maximum Y to minimum Y value.
• Y, the columns are horizontal and aligned with the block model Y axis and are processed in order of minimum Y to maximum Y value.
• -Z, the columns are vertical and are processed in order of maximum Z to minimum Z value.
• Z, the columns are vertical and are processed in order of minimum Z to maximum Z value.

The block model attribute that contains a bench identifier. Where the value of this attribute changes in a column, a bench contact exists and reduction/dilution is calculated.

• Selected: Constrain the diluted blocks. The Enter constraints form opens when you apply this Block model dilution & reduction form.
• Cleared: Does not constrain the diluted blocks.

The name of the report file.

The value that the master attribute for block or interval must meet or exceed for that block or interval to be reclassified as ORE.

• Selected: Reclassifies WASTE layers whose diluted grade is above cutoff as ORE.
• Cleared: Does not reclassify WASTE layers.

• Selected: Reclassifies ORE layers whose diluted grade is below cutoff as WASTE.
• Cleared: Does not reclassify ORE layers.