coal field

an area containing significant coal deposits.

Origin of coal field

First recorded in 1805–15

In Hyderabad it includes the important Singareni coalfield, but in the Presidency no good coal seams have yet been found.

Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 3 |Various
On a collection of insect-remains from the South Wales coalfield.

The Biotic Associations of Cockroaches |Louis M. Roth
In this respect also one coalfield differs greatly from another.

Supply and Demand |Hubert D. Henderson
Upon these rocks the coalfield of Whitehaven rests and extends as far as Maryport.

Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 |Various

Toward the last we had seen evidences of the great La Plata coalfield, to which I must devote a paragraph.

The Crest of the Continent |Ernest Ingersoll

coalfield

/ (ˈkəʊlˌfiːld) /

an area rich in deposits of coal