Coalfield (noun)

An area containing coal deposits that are suitable for mining.

Origin:

Formed from the words 'coal' and 'field'.

Examples:

1. The coalfield in the valley was a major source of employment for generations.
2. The coalfield in the region was depleted and had to be closed down.
3. The coalfield in the mountain range was the largest in the country.
4. The coalfield in the state was a major contributor to the energy needs of the country.
5. The coalfield in the province was a major source of income for the government.