Anomaly Identification

The 99th percentile was used to classify samples as "enhanced" in any element for the purposes of a MineMatch® description.

MineMatch® reports for each cluster of anomalies list the anomalous elements which characterise the cluster, and include, in the "Comments" column of the report, a statement as to whether the element is anomalous within the entire population, the lithology-specific population, or both populations.

Suggested Reading

Steve Amor provides an overview of geochemical data presentation and interpretation for exploration, which includes a discussion of the advantages of using percentiles to set anomaly thresholds.

Thresholds by Lithology

Different thresholds were calculated for each lithlology. Click on the icons below learn more.

Regional Silt Geochemistry Statistics

A large number of statistical graphics have been prepared to assist with the interpretation of the stream sediment data used in this study, and to support the use of the 99th percentile as the threshold above which to regard a sample's analytical result as "anomalous" or, in MineMatch® terminology, "enhanced".

These plots are likely to be of value beyond the scope of target generation in minerals exploration. Environmentalists will be interested in the information they provide about stream compositions. Bedrock mappers will be interested in the extent to which they validate lumping and splitting of rock types into different mappable lithological units at a scale of 1:250,000.