Monkwearmouth Colliery (or Wearmouth Colliery) was a major North Sea coal mine located on the north bank of the River Wear, located in Sunderland. It was the largest mine in Sunderland and one of the most important in County Durham in northeast England. First opened in 1835, the mine was the last to remain operating in the County Durham Coalfield. The last shift left the pit on December 10, 1993, ending over 800 years of commercial coal mining in the region.
For more on the 800 year history of coal mining in County Durham, read The Coalminers of Durham.