Ore
Definition and meaning of Ore in chemistry.
An ore is a naturally occurring mineral or rock from which economically valuable metals or elements can be profitably extracted through processing.
In more detail
Ores are natural concentrations of economically valuable mineral compounds (metal oxides, sulfides, carbonates, or silicates) mixed with waste rock and other minerals. The term "ore" specifically requires economic viability; a rock may contain valuable elements, but it is only classified as ore if extraction and processing are profitable at current metal prices. This economic definition means that as prices change or technology improves, rocks previously unsuitable for mining may become classified as ores. Ores undergo multiple processing steps, typically including concentration, roasting (heating sulfide ores in air to convert them to oxides), calcination (heating carbonate ores to drive off carbon dioxide and yield oxides), leaching (dissolving in chemical solutions), or reduction (using carbon or other reducing agents).
Key facts
| Field | Inorganic Chemistry |
|---|---|
| Common types | Metal oxides, sulfides, carbonates, and silicates |
| Definition requirement | Economically profitable to extract and process |
| Example mineral | Hematite (Fe2O3) |
Hematite (Fe2O3) is one of the most important iron ores, processed in blast furnaces where carbon monoxide reduces the iron oxide to molten iron that can be further refined.
Frequently asked questions
What is the difference between an ore and a mineral?
A mineral is a naturally occurring crystalline solid with a specific chemical composition. An ore is a rock containing valuable minerals in concentrations high enough to extract economically.
What makes a rock become classified as an ore?
Economic viability. As metal prices rise or extraction technology improves, rocks that were previously unprofitable to mine may become ores. Conversely, if prices fall, some ores may cease to be economically viable.