Compositing Downhole Data

The Discover for ArcGIS Pro drillhole data compositing functions provide the tools to composite downhole data by the following methods:

Compositing by Cut-Off Grade

Compositing by cut-off grade is commonly used to summarize assay data into intervals above a specified value. A minimum interval length can also be specified along with internal dilution constraints.

The composited interval is calculated using a downhole running weighted average of consecutive samples that conform to the cut-off grade parameters. Cut-off grade composites can only be calculated for one element at a time.

Compositing by Elevation and Downhole Depth

Compositing by elevation is useful to normalise downhole data tables to a consistent sampling interval or mining bench height. Select the downhole data tables from the current project to composite and the compositing interval. Values in character columns may be cleared to avoid incorrect values being present, whereas values in numeric columns are composited using a weighted average.

Compositing by a Unique Attribute

Compositing by unique attribute is commonly used to merge contiguous drillhole intervals together that contain the same attribute, e.g. lithology, alteration, etc. A table may be composited using the intervals generated from compositing a column in another table, e.g. assay grades can be composited based on lithology composite intervals.