Key fields

This topic is part of the Grade Estimation range of topics.

If each record in the sample data file is identified by a key field, then the number of samples per key field value can be restricted. The most obvious use of this feature is to prevent samples from a single hole having an overpowering influence on the estimated grade of a cell. In the following example the key field is defined as BHID. The name of the key field is specified as field KEY (i.e. *KEY(BHID)). The maximum number of samples with the same key field value is defined using field MAXKEY in the Search Volume Parameter file. If MAXKEY is set to absent data or zero, then the key field option is not be used.

If octant search is selected then the MAXKEY parameter applies to the number of samples within an octant.

Go to the next topic (Search Volume Parameter file table)