Holes/Samples Weight Rules

This column will only be enabled if one of internal blast holes, external drill-holes or external samples have been specified as the source on the Hole/Sample Source Tab in Data Source Definitions. This allows the user to specify how values from the source are to be weighted when used for any of weighted Grade-Block Rule Types (Wtd. Mean, Std. Dev., and Variance).

The setting up of these weight rules are identical to setting up weights for block models, so will not be discussed in detail here.

One thing worth noting is that most commonly drill-hole or blast hole data will be weighted by the length of the hole within the grade-block (or that part of it containing the attribute in question). There is a defined system variable hole_length as described in the appendix which contains this value.