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Ore, naturally occurring rock containing high concentrations of one or more
metals that can be profitably mined. Ore minerals are the minerals within
ores that contain the metal. Ores occur as large bodies of rock called ore
deposits, which are
metal-bearing mineral
deposits.
The criteria for judging
that a rock…

Page 2

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Most metals must be extracted from rocks, called ores, in the Earth's crust.
Ores contain the metal, or a compound of the metal, in a high enough
concentration to make it worth extracting the metal.
Oxidation and reduction
Oxidation is the gain of oxygen by a substance. For example, magnesium…

Page 3

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The method used to extract a metal from its ore depends upon the stability
of its compound in the ore, which in turn depends upon the reactivity of the
metal:
The oxides of very reactive metals, such as aluminium, form stable oxides
and other compounds. A lot of energy is…

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