Indium prospectivity
across the USA.
Indium enrichment in zinc-sulphide and tin-polymetallic systems, ranked and explained — validated across the United States.
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What the model reads for indium.
Every indium target is scored on the same seven lines of evidence — with a pathfinder-geochemistry signature tuned to this system.
Host rock
rock type and age
Gravity & magnetics
buried structures and intrusions
Radiometrics
potassium, thorium, uranium
Terrain shape
elevation, slope, aspect
Surface texture
radar (Sentinel-1)
Alteration
mineral signatures from satellite
Pathfinder chemistry
the elements that point to your commodity
Pathfinder geochemistry the model weighs
Lead signal: Zinc, tin and copper. These are the elements this national model actually reads to rank indium ground.
What is indium?
Indium is a soft, silvery post-transition metal so scarce and finely dispersed that it forms no ore of its own. It is won almost entirely as a by-product, recovered from the zinc-sulphide mineral sphalerite during zinc smelting, where indium substitutes into the crystal lattice at concentrations ranging from a fraction of a part per million to around a hundred. Its best-known discrete mineral, roquesite, a copper-indium sulphide, occurs only in trace amounts and is never economic on its own. MineDSS models indium through the two host families that carry most of the world's resources: zinc-sulphide systems and tin-polymetallic systems. Both leave a mappable footprint of sulphide mineralisation, hydrothermal alteration and a distinctive multi-element geochemical halo, which is exactly the pattern a prospectivity model is built to read across large, partly covered terrains.
The deposit model
Indium is a passenger metal: it concentrates wherever sulphide chemistry favours its entry into sphalerite and associated minerals, so the model targets the settings that host it rather than an indium ore body. Zinc-sulphide systems — volcanogenic massive sulphide, sediment-hosted zinc-lead, skarn and polymetallic epithermal deposits — carry indium within sphalerite, and its tenor rises where zinc and copper run high together. Tin-polymetallic systems concentrate the richest indium of all, as sulphide-bearing veins, breccias and replacement zones around granitic intrusions, where cassiterite, chalcopyrite and indium-rich sphalerite are deposited together at higher temperatures. MineDSS reads these settings by combining mapped intrusive and host-rock geology and structure, geophysical signatures of buried plutons and conductive sulphide bodies, satellite-derived indications of altered ground, and the pathfinder geochemistry that trails a mineralising system, ranking ground by its resemblance to well-characterised indium-bearing systems.
Why it matters
Indium is classed as a critical or strategic mineral across several major economies because its supply is both concentrated and captive. There are no primary indium mines anywhere; every tonne is recovered as a by-product of zinc, and to a lesser extent tin, lead and copper processing, so output is governed by base-metal economics rather than by indium demand. Refining is heavily concentrated in a small number of countries, recent export controls have tightened availability, and governments have moved to build strategic stockpiles of high-purity metal. Set against rising demand from displays, thin-film solar and high-speed electronics, this makes transparent, defensible targeting of indium-bearing ground a matter of genuine supply-chain and national interest for explorers and the governments that permit them.
Where it's used
Indium's dominant use is indium tin oxide, the transparent conductive coating that carries the electrical signal across flat-panel displays, touchscreens and the front contacts of many photovoltaic cells, a role for which no equal-performing substitute exists at scale. It is the basis of copper-indium-gallium-selenide thin-film solar cells, and of compound semiconductors — notably indium phosphide substrates that route high-speed optical data through fibre networks and data centres, together with indium gallium arsenide detectors, light-emitting diodes and laser diodes. Lower-melting indium alloys and solders serve as fusible seals, thermal-interface materials and cryogenic bonds. Together these applications place indium at the heart of modern electronics and clean-energy hardware.
How MineDSS reads it
Because indium rarely forms an anomaly of its own, the diagnostic evidence is the company it keeps. MineDSS reads the co-located pathfinder suite qualitatively rather than through fixed weights, led by zinc, tin and copper and completed by lead, silver, cadmium and tungsten. These trace the sphalerite host, the granite-related tin-polymetallic association and the base-metal sulphide chemistry into which indium partitions. The geochemistry is interpreted alongside mapped intrusive and host-rock geology and structure, geophysical expressions of concealed plutons and sulphide bodies, and satellite indications of altered ground. The model is trained on the most anomalous indium assays — roughly the top 11% of measured values — and treats no single line as decisive, ranking a coherent, mutually reinforcing pattern more highly than any isolated anomaly.
Indium prospectivity — common questions
Which indium deposit types does MineDSS model?
MineDSS models indium through two host families: zinc-sulphide systems and tin-polymetallic systems. Zinc-sulphide systems — volcanogenic massive sulphide, sediment-hosted zinc-lead, skarn and polymetallic epithermal deposits — carry indium inside sphalerite, its principal host mineral. Tin-polymetallic systems, the sulphide-rich veins, breccias and replacement zones associated with granitic intrusions, host the richest indium of all, alongside cassiterite and chalcopyrite. Indium is not mined in its own right; it is recovered as a by-product, and its best-known discrete mineral, roquesite, is never economic alone, so the model ranks ground by its resemblance to these indium-bearing host systems rather than to any indium ore.
How is the model's accuracy measured, and where is indium available?
We validate every model the hard way — held-out spatial cross-validation. We hide known deposits, rebuild the model without them, then test whether it still finds them, with test blocks kept spatially separated so it cannot memorise nearby points. We are currently refreshing our published national skill figures so they reflect deployment-time performance, and will republish them per model. Coverage today spans the United States; the figures are model-level skill, never a specific site's measured accuracy, and never a discovery or JORC / NI 43-101 resource claim.
Which pathfinder elements does MineDSS use for indium?
The seeded pathfinder suite is led by zinc, tin and copper and completed by lead, silver, cadmium and tungsten. Because indium hides in sphalerite and in the sulphides of tin-polymetallic systems rather than forming its own anomaly, these elements are essential: they trace the zinc-sulphide host, the granite-related tin association and the base-metal sulphide chemistry into which indium partitions. MineDSS interprets this geochemistry qualitatively and alongside other evidence — mapped intrusive and host-rock geology and structure, geophysical signatures of concealed plutons and sulphide bodies, and satellite indications of altered ground — rather than applying fixed weights to any one element.
Does a high MineDSS score mean a deposit or a resource estimate?
No. A high score means ground is geologically similar to known indium-bearing systems and is flagged for closer exploration; the model is trained to recognise the most anomalous indium enrichment — samples assaying at or above 0.1 ppm indium, roughly the top 11% of assayed values. It is not a discovery, not a JORC or NI 43-101 resource estimate, and not drilling or investment advice. Because indium is recovered as a by-product of zinc and tin sulphide ores, confirming whether it is present in recoverable quantity and grade still requires field programmes, drilling and independent assessment by qualified professionals.
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