Intrusion

On the Implicit tab, in the Lithology group: Click Intrusion to generate a wireframe representing the extents of lithology units based on downhole logging information. The inputs specified in the Intrusion Lithology Modelling form will be a Drillhole Database and the Interval file that contains the lithology data.

Input

Drillhole Database

Double-click (F3) to select from a list of databases in the current project. Alternatively, you can right-click and choose Select Database . You can also Edit the properties of an existing database or create a New database.

Select the Filter check box if you want to apply a filter to the database. Enter a filter number in the adjacent response. Double click (F3) to see a list of existing filters. Right click (F4) to open the dialog box where you can create a new filter.

Interval file

Double-click (F3) to select an Interval file that contains the grades you want to interpolate. You can optionally apply a Filter to the records in the file.

Lithology field

Double-click (F3) to select the name of a Character field that contains the lithology codes you want to include or exclude from the interpolation.

Lithology to Model

When you select a valid Lithology field, the Exclude grid is populated with a full list of Lithology codes. Use the arrows between the Include, Exclude and Ignore grids to select the codes you want to include, exclude and ignore.

The points for each of the Lithology codes in the Include and Exclude columns will be assigned a positive or negative value respectively. This value will be the distance from the closest 0 (boundary points).

For Included codes, the values will be positive. For Excluded codes, the values will be negative. Ignored codes are excluded altogether from the interpolation.

Model using Indicator values

Select this option to model the lithology using Internal and External indicator values.

Surface Control

To constrain the model to your drillholes, you can choose to create intercepts at the collar and at the end of each hole.

Create intercepts at collar

When this check box is selected, if an INCLUDED interval begins at the collar, a contact point will be created at the collar.

Create intercepts at end of hole

When this check box is selected, if an INCLUDED interval ends at the end of the hole, a contact point will be created at the end of the hole.

Model distance to contact

Select this option to model the distance to contact.

Note: To better utilise processor resources across multiple applications and tasks, when running computer-intensive operations it may be necessary to reduce the number of cores used by the application.

To modify the number of cores the application can use:

Click the Project tab to open the backstage menu.
Click on the Resources tab of the Options | System | System Options form.