Mineral Deposit
A naturally occurring concentration of minerals in the earth's crust that may be of economic interest.
Detailed Definition
A mineral deposit is a naturally occurring concentration of minerals or metals in the earth's crust in sufficient quantity and grade to potentially warrant economic extraction. Mineral deposits are classified by their formation process, geometry, and commodity.
- Magmatic: Formed from cooling magma (e.g., chromite, PGE deposits)
- Hydrothermal: Formed from hot mineral-bearing fluids (e.g., epithermal gold, porphyry copper)
- Sedimentary: Formed through sedimentary processes (e.g., banded iron formations, evaporites)
- Placer: Formed by mechanical concentration in streams and beaches (e.g., alluvial gold)
- Supergene: Formed by surface weathering and enrichment (e.g., oxide copper)
- Metamorphic: Modified or concentrated by heat and pressure
- Vein/lode: Tabular body filling a fracture or fault
- Disseminated: Dispersed mineralization throughout a rock mass
- Massive: Large, solid body of ore minerals
- Stratiform/stratabound: Confined to specific sedimentary layers
- Stockwork: Network of small, intersecting veins
- Placer: Loose, unconsolidated surface deposits
Economic considerations: Not all mineral deposits are economically viable. A deposit becomes "ore" only when it can be mined and processed at a profit under current conditions.
Reporting standards: Mineral deposits are reported following recognized standards (SEC S-K 1300, NI 43-101, JORC Code) with specific requirements for resource classification and disclosure.
Related Terms
Mineral Resource
A concentration of minerals with reasonable prospects for economic extraction, classified as inferred, indicated, or measured.
Mineral Reserve
The economically mineable portion of a measured or indicated mineral resource, classified as probable or proven.
Ore
Rock or material from which valuable minerals or metals can be profitably extracted.
Exploration
The systematic process of searching for mineral deposits through geological, geophysical, and geochemical methods.