炭田

1. Origins, structure, and basic meaning

• Structure: 炭田 (たんでん) is a geological and industrial noun for an area containing extensive coal deposits.
• Basic usage: 炭田で栄えた町 identifies the area underlying a town’s former prosperity, while 広い炭田が記される makes the coal-bearing region the subject marked on a map.

2. Common pitfalls and similar expressions

• A field rather than one mine
  • The referent in 炭田で栄える and 炭田が記される is a broad coal-bearing area. It should not be narrowed to one shaft or mine building.