Coal seam

Ore deposit

Layers of coal formed from the peat of ancient wetland forests, buried and cooked; vast coalfields date from the late Carboniferous and early Permian.

Rocks

Coal

Minerals

Pyrite, Marcasite

Worked

Before and since the industrial age

Examples

Fushun, China, used to smelt copper about 1000 BC; Every major coalfield of England and Wales, worked by the Romans

Sources

• Coal. Wikipedia.

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