Drillhole Extraction is used to perform mathematical operations on numeric fields in a drillhole interval file while grouping records based on constant field values and respecting downhole interval geometry defined by FROM and TO fields.
The tool is typically applied to assay or geology interval files to extract summary information without modifying the original data. All results are written to a new output file.
Overview
Drillhole Extraction allows users to:
calculate averages, weighted averages, minimums, maximums, and sums
work with irregular interval lengths
control grouping using up to three constant fields
manage interval continuity using gap and thickness rules
The extraction process operates on consecutive records while values in the selected constant fields remain unchanged.
How Drillhole Extraction works
The extraction process is governed by three components:
Constant fields define how records are grouped
FROM and TO fields define interval position and length
Extraction type defines how numeric values are summarised
A new output record is written whenever the value in a constant field changes.
Example: Maximum Au by hole and lithology
This example extracts the maximum Au value for each hole and lithology combination from an assay interval file.
Records are grouped by HOLE_ID and Lithology
FROM and TO fields define the downhole intervals
Extraction type is set to MAXIMUM
For each hole–lithology group, the tool scans all intervals and writes one output record containing the highest Au value encountered. The original assay data remains unchanged.
Figure 1: Drillhole Extraction setup and output for maximum Au by hole and lithology
Figure 2: Visualisation of extracted maximum Au values along drillhole traces
Notes
MAXIMUM extraction identifies peak values only and does not consider interval length
Weighted calculations require the WTAVE extraction type
Gap and minimum thickness settings can be used to manage interval continuity
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