1. an area of land where coal is found beneath the surface and can be mined

Examples

• The Appalachian coalfield stretches across several states.
• Miners worked in the coalfield for decades before it was exhausted.
• The company purchased rights to explore the new coalfield.
• Environmental concerns arose about mining in the coalfield.
• The town’s economy depended entirely on the local coalfield.
• Geologists mapped the boundaries of the coalfield.