Duddo Colliery, also referenced as Greenlaw-walls Colliery, was a working north east of Duddo between at least the 1810s and the 1860s. It was a small complex on the turnpike to Wooler, featuring two shafts and a couple of ancillary buildings. It was owned by Thomas Friar - Duddo's predominant landowner who also owned the nearby tile works, farm as well as the unconsecrated Church of St James. I imagine Thomas used the coal as fuel at the nearby tile works, as well as providing it commercially to folks in the local area.

It is referenced in a newspaper piece in 1814 as being on let. It was at this time owned by a Mr John Carr of Ford.

The colliery was the site of a sad disaster in April 1857, when 5 people drowned when the mine flooded. These workings were apparently very close to a much earlier working, and the division was not strong enough to prevent the weight of water meaning it gave way. The men who died had only been down there for half an hour. None of the bodies were recovered. Their names were Robert Hogarth, Andrew Oliver, Thomas Patterson and John Robson.

There is reasonable potential a couple of these men may have lived in the nearby Mattilees, which was a pit row which still exists today. The pit never appeared to reopen after the flooding.