1. areas of land where coal is found and mined
Usage: plural form

Examples

• The coalfields of West Virginia have been mined for over a century.
• Many families in the coalfields depend on mining for their livelihood.
• Environmental concerns have grown around the old coalfields.
• The government invested in retraining programs for workers from declining coalfields.
• Geologists discovered new coalfields in the northern region.
• The coalfields provided energy for the industrial revolution.