North Wales Coalfield

A much smaller area on Anglesey where coal was formerly mined is not usually considered to form a part of the coalfield, although it is geographically in the North Wales region.

Trade developed swiftly and by 1616, the principal collieries were at Bagillt, Englefield, Leaderbrook, Mostyn, Uphfytton and Wepre.

[1] Most were horizontal adits or shallow bell pits, although a few were sufficiently large to have accumulations of water and ventilation problems.

[2] In the Denbighshire Coalfield, the areas of Chirk, Ruabon and Wrexham became heavily industrialised and exploited large deposits of iron, coal and clay.

[1] The Flintshire Coalfield extends from the Point of Ayr in the north, through Connah's Quay to Caergwrle in the south and under the Dee Estuary to the Neston area of the Wirral Peninsula.