Drill hole analysis functions

The Drillhole Analysis functions use the same algorithms as the equivalent Block Model functions. The results are stored in the form of string files.

The string files produced by the Ore/Waste Discrimination or Dilution & Reduction functions are necessary inputs to the Recoverable Product function.

The algorithms are similar to the Block Model functions except that the functions:

• have different inputs and outputs.
• operate down a drill hole in the same way as the Block Model functions operate down a column of blocks. Interval widths are calculated from downhole distances and not differences in elevation.

Definitions

A band is a contiguous set of intervals whose grades are either all below cutoff or greater than or equal to cutoff. Bands are not subject to minimum width criteria.

A layer is a band whose width meets or exceeds a given minimum and is thus classifiable as ORE or WASTE.

The Drillhole Analysis functions are as follows:

DRILL HOLE ANALYSIS
Ore/Waste Discrimination	Classifies intervals down a drill hole as ORE or WASTE according to cutoff or minimum thickness criteria.
Dilution & Reduction	Applies dilution and reduction to ORE or WASTE contacts and to the tops and bottoms of intervals in a drill hole.
Recoverable Product	Calculates the volume of recoverable product for each ORE layer.