KNA - Select Locations

To access this dialog:

Using the Advanced Estimation dialog, select Select Locations from the left-hand menu system.

This panel is used to define the parameters and locations to be used for the KNA optimization. The KNA process allows the user to select optimum values for parameters to be used in the estimation, such as the number of discretisation points, the block size and the search volume. This is achieved by selecting up to three areas with different sampling densities, evaluating a set of statistics for a grid of model blocks in each area and displaying a scatter or line plot for each statistic and estimation parameter value. The sensitivity of each statistic to changes in estimation parameter values can then be identified and the optimum values selected.

This panel is only visible if Supervisor data is not being imported. You decide this using the Scenario Setup screen.

Note: Advanced Estimation is part of the Studio RM toolset. Additional licensing modules aren't required.

Field Details:

Select Variogram: select the variogram model set to be used for the analysis by double clicking the required row in the table.

Define Grid Parameters: the model block grid to be used for the analysis can be defined either by ticking the Define from prototype box and selecting an existing prototype model or by leaving the box unticked and entering the origin, initial block size and grid rotation parameters into the appropriate text boxes. The Initial block size is used to define the default base block size for subsequent optimizations. The initial block size is used to define the default base block size for subsequent optimizations.

Select Locations : the user can select up to three areas for which the KNA analysis is undertaken. As can be seen on the Select Locations panel these are described as Well Informed, Moderately informed and Sparse. The analysis can be presented separately for each area or averaged over all areas. The names are intended to describe areas with different sampling densities but could be used for other purposes.

In order to be able to choose representative areas it is best if the drillhole data is first displayed in the 3D window. To define a location, first highlight a description, then click the Select in 3D window arrow and select a point in the 3D window. The coordinates of the point will be displayed in the Select Locations table and indicated in the 3D view as a colored disc. Repeat the procedure for each area required.

Test grid size around selected locations:the process calculates the cell within which the location point lies and then creates a grid of cells around it based on the values in the X, Y and Z text boxes. The default values are 3x3x3 (27) test blocks for each location. If three locations are defined then this gives a total of 81 test blocks.

Before moving on to the Optimize panel make sure you have selected a variogram model set from the Select Variogram area in the top left corner of the panel by double-clicking the required model set.

	Related Topics
	Optimize Optimize Discretization Optimize Block Sizes Optimize Search Parameters