Chromium prospectivity
across the USA & Canada.
Stratiform and podiform chromite in mafic–ultramafic complexes, ranked and explained — validated across the USA and Canada.
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What the model reads for chromium.
Every chromium 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: Nickel, cobalt and scandium. These are the elements this national model actually reads to rank chromium ground.
What is chromium?
Chromium is a hard, silvery, corrosion-resistant transition metal, and in nature it is won almost entirely from a single ore mineral, chromite — an iron-chromium oxide of the spinel group. Chromite crystallises early from mantle-derived magmas, so its economic concentrations are confined to mafic and ultramafic rocks. MineDSS models chromium through two seeded deposit systems: stratiform chromite in layered mafic–ultramafic intrusions and podiform chromite in ophiolite complexes. Both are magmatic accumulations of chromite grains, and both leave a mappable footprint — distinctive ultramafic host lithologies, characteristic magnetic and gravity responses, and a co-located suite of nickel-, cobalt- and platinum-group geochemistry — which is exactly the pattern a prospectivity model is built to read across large, partly covered terrains.
The deposit model
Stratiform chromite forms in large, slowly cooled layered mafic–ultramafic intrusions, where chromite settles and accumulates as laterally persistent seams within a repeating igneous stratigraphy; these layered complexes hold the great majority of the world's chromite resource and are commonly associated with platinum-group reefs and nickel–copper sulphides. Podiform chromite forms in the mantle section of ophiolites — fragments of oceanic lithosphere obducted onto continents — where chromite concentrates as pods and lenses within dunite and harzburgite through reaction between percolating melt and residual peridotite. MineDSS reads these settings by combining mapped ultramafic and intrusive geology, geophysical signatures that resolve dense, magnetic ultramafic bodies and serpentinised ground, satellite-derived indications of weathered and altered rock, and the pathfinder geochemistry that trails a mafic–ultramafic system, ranking ground by its resemblance to well-characterised stratiform and podiform chromite settings.
Why it matters
Chromium is one of the most important strategic and critical materials, and it appears on critical-minerals lists across major economies because it has no substitute in its principal uses. It is indispensable to stainless steel — where chromium is what makes the steel stainless — and to the nickel- and cobalt-based superalloys used in jet engines, gas turbines and other high-temperature, high-stress applications. Supply is highly concentrated: a small number of countries account for most mined chromite and ferrochrome, and many industrial economies hold little domestic production and rely heavily on imports. That combination of irreplaceability and concentrated supply makes transparent, defensible identification of prospective ground a genuine strategic concern for explorers and governments alike.
Where it's used
The dominant use of chromium is metallurgical: most mined chromite is smelted into ferrochromium, the master alloy added to molten steel to make stainless and heat-resisting steels, and to alloy and tool steels that need hardness and corrosion resistance. Chromium is likewise essential to nickel- and cobalt-based superalloys for aerospace and power generation. Beyond metallurgy, chromium is electroplated onto metals for decorative and hard-wearing finishes, used in refractory bricks that line high-temperature furnaces, and processed into chromium chemicals for pigments, leather tanning, catalysts, surface treatments and corrosion inhibitors. Several of these roles have no ready substitute, which keeps secure supply an industrial and national priority.
How MineDSS reads it
Chromite is a magmatic mineral tied to mantle-derived rocks, so the diagnostic geochemistry traces the fertile mafic–ultramafic host rather than chromium alone. MineDSS reads a pathfinder suite qualitatively, led by nickel, cobalt and scandium, which concentrate in the same ultramafic lithologies and their weathering profiles, alongside vanadium, platinum and iridium that mark the associated oxide, sulphide and platinum-group chemistry of layered intrusions and ophiolite chromitites. These signals are interpreted together with mapped ultramafic and intrusive geology, geophysical expressions of dense and magnetic ultramafic bodies and serpentinisation, and satellite indications of altered and weathered ground. No single line is treated as decisive; the model weighs converging evidence for a fertile mafic–ultramafic system rather than any one element in isolation.
Chromium prospectivity — common questions
Which chromium deposit types does MineDSS model?
MineDSS models two seeded deposit systems: stratiform and podiform chromite, both hosted in mafic–ultramafic rocks. Stratiform chromite occurs as laterally persistent seams within large, slowly cooled layered intrusions, which hold most of the world's chromite resource and are commonly associated with platinum-group reefs and nickel–copper sulphides. Podiform chromite occurs as pods and lenses of chromite within the dunite and harzburgite of ophiolites — slices of oceanic mantle obducted onto continents. Both are magmatic accumulations of chromite, the only ore mineral of chromium, and the model ranks ground by its resemblance to these settings rather than representing unrelated deposit styles.
How is the model's accuracy measured, and where is chromium 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 and Canada; 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 chromium?
The seeded pathfinder suite is nickel, cobalt, scandium, vanadium, platinum and iridium, with nickel, cobalt and scandium carrying the lead signal. These elements track the mafic–ultramafic host and the oxide, sulphide and platinum-group chemistry that accompanies chromite in layered intrusions and ophiolite chromitites, rather than chromium itself, which is locked in the ore mineral chromite. MineDSS interprets this geochemistry qualitatively and alongside other evidence — mapped ultramafic and intrusive geology and structure, geophysical signatures of dense and magnetic ultramafic bodies and serpentinisation, and satellite indications of altered and weathered ground — rather than applying fixed numeric 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 mineralised systems and merits closer exploration attention. It is not a discovery, not a JORC or NI 43-101 resource or reserve estimate, and not drilling or investment advice. MineDSS ranks prospectivity to help prioritise where to look; confirming whether chromite is present, and in what quantity and grade, still requires field programmes, drilling and independent assessment by qualified professionals.
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