Geochemical Exploration Techniques for Mineral Deposits
Summary
Geochemical exploration for mineral deposits encompasses a suite of field, laboratory and data‐analysis methods designed to detect the subtle chemical footprints of buried mineralisation. Central to this endeavour is the collection of surficial materials—soils, stream sediments, glacial tills and regolith—followed by the selective extraction of grain‐size or density fractions most likely to concentrate pathfinder elements. Techniques range from conventional bulk geochemical assays to advanced fine‐fraction separations (<2 µm) and mineralogical analyses using automated scanning electron microscopy. Indicator minerals and pathfinder element distributions are interpreted through geochemical vectoring to infer proximity and character of underlying ore bodies. Integration of geochemical proxies with geological mapping, geophysical surveys and landscape evolution models has improved targeting efficiency in covered terrains, reducing exploration risk and environmental impact. Emerging approaches include the analysis of metal‐bearing nanoparticles in geogas and the application of machine learning to landscape classification to optimise sample placement and data interpretation on a regional scale.
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Geochemical Exploration Techniques for Mineral Deposits publication trend
The graph below shows the total number of articles in geochemical exploration techniques for mineral deposits across all publications each year (not limited to Nature Index journals).
Technical terms
Heavy mineral concentrate (HMC): A density‐separated fraction of sediments enriched in dense minerals used to isolate indicator grains.
Indicator mineral: A mineral phase whose presence, chemistry or morphology signals proximity to a specific deposit type.
Till: Glacially derived, unsorted sediment used as a sampling medium in cold‐region exploration.
Ultrafine fraction: The <2 µm or similar small‐particle portion of a sample, often enriched in mobile geochemical signals.
Geochemical vectoring: The process of interpreting spatial variations in element or mineral distributions to point towards an orebody.
References
- Stream Sediment Indicator Mineral Signatures of the Casino Porphyry Cu-Au-Mo Deposit, Yukon, Canada. Economic Geology (2023).
- Application of ultrafine fraction soil extraction and analysis for mineral exploration. Geochemistry Exploration Environment Analysis (2019).
- Metal-Bearing Nanoparticles Observed in Soils and Fault Gouges over the Shenjiayao Gold Deposit and Their Significance. Minerals (2019).
- Detecting Buried Porphyry Cu Mineralization in a Glaciated Landscape: A Case Study from the Gibraltar Cu-Mo Deposit, British Columbia, Canada. Economic Geology (2022).
- Regolith characterization and landscape evolution for geochemical exploration of the covered Yamarna Terrane, Western Australia. Journal of Geochemical Exploration (2022).
- Using Machine Learning to Map Western Australian Landscapes for Mineral Exploration. ISPRS International Journal of Geo-Information (2021).
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