Words to Describe coalfield

How coalfield often is described ("________ coalfield")

• yorkshire
• rhenish
• principal
• booming
• smaller
• hidden
• vast
• entire
• chief
• westphalian
• west
• northumberland
• central
• western
• austrasian
• northumbrian
• neighbouring
• great
• meuse
• only
• indian
• productive
• small
• scottish
• south
• derbyshire
• huge
• important
• main
• nottinghamshire
• british
• pennine
• eastern
• nearby
• northern
• north
• leicestershire
• asturian
• nest
• visible
• brown
• ruhr
• established
• tiny
• northeastern
• appalachian
• greatest
• welsh
• valuable
• narrow
• concealed
• adjacent
• immense
• cumbrian
• proved
• east
• profitable
• large
• exposed
• continuous
• rich
• kuzbass
• richest
• french
• inter
• belgian
• largest
• major
• extensive
• southern
• oldest
• enormous
• developed
• whole
• nearest