MineArchiveHartley 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 |
|---|---|---|
| Cramlington Colliery | Northumberland | 1929–? |
| Dudley Colliery | Tyne and Wear | 1929–1947 |
| Gloria Colliery, Hartley | Northumberland | 1935–1946 |
| Hartford Colliery | Northumberland | 1929–1946 |
| Nelson Colliery | Northumberland | 1934–1942 |
| New Delaval Colliery | Northumberland | 1929–1947 |
| Scremerston Colliery | Northumberland | ?–1944 |
| Seaton Burn Colliery | Tyne and Wear | 1938–1946 |
| Seaton Delaval Colliery | Northumberland | 1929–1943 |
| Shankhouse Colliery | Northumberland | 1929–? |
Record created: 3 September 2026 · Last researched: 3 September 2026