Hartley Main Collieries Ltd

A south-east Northumberland colliery company working a group of pits around Seaton Delaval and New Hartley, connected to one another and to the coast by their own railway system. It took over Seaton Delaval Colliery in May 1929.

Mines operated

Mine	Region	Years
Seaton Delaval Colliery	Northumberland	1929–1943

Record created: 3 September 2026 · Last researched: 3 September 2026