stratiform / podiform
Stratiform and podiform chromite in mafic–ultramafic complexes, ranked and explained across Australia, the United States and Canada.
Australia
Ranked targets
United States
Ranked targets
Canada
Ranked targets
Everywhere else
Global model
Ranked targets come with national models in Australia, the United States and Canada. Everywhere else, the global model returns the prospectivity map, the geology behind it and a confidence read. Next, the models are retrained on the full record and new sources, such as hyperspectral imagery, before we use them to rank and select ground.
How we rank chromium ground
The geology, structure, recorded deposits, tenure and geochemistry over the ground, on one map with the source of every layer.
See AtlasWhich ground is open, held or excluded, read from each licensing authority's own register.
See Open GroundThe ground scored for chromium, with the evidence behind it and ranked targets in Australia, the United States and Canada. Anywhere else, the global model maps chromium.
See ProspectivityThe alteration minerals and the structures that control them, from satellite: regional to district scale, and camp scale from WorldView-3.
See SpectralTenure, land access, environment and the real cost to hold and test a chromium position.
See Due DiligenceTalk to us about chromium
Partners, investors, publishers and researchers.
The deposit system
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 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. That is exactly the pattern a prospectivity model is built to read across large, partly covered terrains.
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.
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.
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.
Questions
MineDSS models two 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.
Every MineDSS model is tested before it is served: we withhold whole blocks of ground, rebuild the model without them, and check that it still ranks the anomalous samples there above background, with test ground kept spatially separate. A model that does not pass our release gates is not used, for any mineral, in any country. National models for chromium run in Australia, the United States and Canada, with ranked targets. Anywhere else in the world, the global model returns the prospectivity map, the geology behind it and a confidence read. Skill is model-level, never a specific site's measured accuracy, and never a discovery or JORC / NI 43-101 resource claim.
The classic pathfinders are nickel, cobalt, scandium, vanadium, platinum and iridium, with nickel, cobalt and scandium leading. 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. These elements are part of the geochemical record our models learn from. In a run on any piece of ground, the map itself is read from geology and rock age, gravity and magnetics, radiometrics, terrain, satellite radar and spectral alteration, so it covers ground that has never been sampled.
No. A high score means its evidence closely matches ground where samples assay anomalously high for the target mineral, and it 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.
Exploration and mining companies interested in working with us.
The record, the models and the ground they point to.
Geological surveys, universities and programmes whose work the record is built on.
MineDSS ranks prospectivity to help you decide where to explore next. It is not a discovery, not a JORC or NI 43-101 resource or reserve estimate, and not drilling or investment advice.