Exploration Geochemistry

Exploration geochemistry applies chemical principles to the search for concealed and surficial mineral deposits. By measuring the concentrations and distributions of key elements in rocks, soils, stream sediments, waters and biota, geochemists detect anomalies that outline ore-bearing systems at depth. Primary dispersion patterns develop within host rocks during ore formation, while secondary dispersion arises from weathering, erosion and transport in the near-surface environment. A systematic exploration programme proceeds from broad reconnaissance—typically multi-element stream-sediment surveys—to progressively closer-spaced sampling of soils, residual saprolites, trench walls, drill cuttings and even atmospheric gases. Analytical methods range from conventional fire assay and aqua-regia digestion to in situ microanalysis and isotopic fingerprinting. Data are gridded and visualised as single-element and ratio-based anomaly maps, enabling integration with geological and geophysical models. Modern advances include high-resolution laser-ablation mapping of trace elements, double-spike isotope corrections and machine-learning classifiers, all of which enhance discrimination of subtle pathfinder signals and improve targeting of blind orebodies in complex terrains.

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A comprehensive review of tin geochemistry examined the behaviour of tin in greisen, vein, skarn and placer deposits. The study synthesised cassiterite formation pathways, from mantle-derived granitoids to hydrothermal fluids, and assessed isotope and trace-element proxies that distinguish geochemical environments and guide tin exploration.

In molybdenite, systematic analysis of trace-element assemblages (Re, Se, Ag, Te, W, Sb) coupled with multivariate discriminant statistics demonstrated clear compositional differences between porphyry-Cu–Mo, epithermal, greisen Sn–W and granite-vein Mo deposits. Assemblages of Au–Sb–Te–Pb–Bi in molybdenite proved particularly diagnostic of gold-fertile systems, offering a rapid indicator-mineral tool for early-stage exploration.

A case study of a Cu–Mo–Re–Au porphyry system in northern Greece combined cathodoluminescence imaging, Ti-in-quartz thermometry and in situ fluid-inclusion analysis to resolve the temporal evolution of metal-bearing fluids. Trace-element ratios (Al/Ti, Ge/Ti, Se/Te, As/Sb) in successive quartz generations mapped cooling, phase separation and vapour-meteoric mixing, revealing the physicochemical controls on extreme rhenium enrichment in potassic alteration zones and refining targets for high-Re mineralization.

Exploration Geochemistry publication trend

The graph below shows the total number of articles in exploration geochemistry across all publications each year (not limited to Nature Index journals).

Technical terms

Geochemical anomaly: A concentration of an element that significantly exceeds local background and signals potential mineralisation.

Pathfinder element: A trace element that is mobile during ore formation and indicates the proximity of an economic deposit.

Primary dispersion: The original distribution of metals in the host rock controlled by magmatic-hydrothermal processes.

Secondary dispersion: Redistribution of metals by weathering, transport and sedimentation in surficial environments.

Fluid inclusion: A microscopic droplet of fluid trapped within a mineral that records physicochemical ore-forming conditions.

Cathodoluminescence: Light emitted by minerals under an electron beam, used to image growth zoning and trace-element distributions.

References

1. Exploration of Mineral Resources.
2. Geochemical and geological properties of tin related to ore deposits: A Review. IOP Conference Series Earth and Environmental Science (2023).
3. Trace Element Composition of Molybdenite: Deposit Type Discrimination and Limitations. Minerals (2023).
4. Insights into fluid evolution and Re enrichment by mineral micro-analysis and fluid inclusion constraints: Evidence from the Maronia Cu-Mo ± Re ± Au porphyry system in NE Greece. Mineralium Deposita (2024).