| Collieries | Index | Collieries |
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Colliery/Mine Information Pages - Index
Pages updated since 01 Jun 2008 are highlighted thus: 
| Colliery | Location | Cnty | Opened | Closed | |
|---|---|---|---|---|---|
|
Oakenshaw Colliery | nr. Brancepeth | DUR | ||
| Oakly Bank Quarry | Evenwood | DUR | |||
| Oakshaw Colliery | Bewcastle | CUL | |||
| Oakshawford Drift | Brampton | CUL | Oct 1948 | ||
| Oakwellgate Colliery | Gateshead | DUR | |||
| Oatlands Colliery | Distington | CUL | Apr 1934 | ||
| Old Bank Drift | Eston, Middlesbrough | NRY | |||
| Old Bridge Colliery | East Woodburn | NBL | Dec 1900 | ||
| Old Durham Colliery | Shincliffe, Durham | DUR | 1849 | ||
| Old Eldon Drift | Shildon | DUR | |||
| Old Etherley Colliery | Etherley | DUR | |||
| Old Fall (Lead Ore) | St. John's Chapel | DUR | 31 Dec 1928 | ||
| Old Gang (Lead Ore) | Swaledale | NRY | |||
|
Old North End Colliery | Cockfield | DUR | ||
| Old Pit | North Sheilds | NBL | 1811 | ||
| Old Pit | Durham | DUR | 07 Nov 1924 | ||
| Old Throckley Colliery | Newburn | NBL | |||
| Old Towns Quarry | Middridge | DUR | |||
| Oregill (Iron Ore) | Egremont | CUL | |||
| Original Elterwater (Slate) | Elterwater | WES | |||
| Ormesby (Ironstone) | Ormesby | NRY | Jan 1892 | ||
| Osmondcroft (Winston) Drift | Winston, Darlington | DUR | 1988 | Aug 1991 | |
| Osmondcroft Colliery | Winston | DUR | |||
| Oswald Pit | Craghead | DUR | 1839 | 11 Apr 1969 | |
| Oughterside Colliery | Aspatria | CUL | 24 Jun 1933 | ||
| Oughterside Opencast | Maryport | CUL | |||
| Ouston Colliery | Ouston | DUR | bef. 1815 | Jan 1959 | |
| Outfields Colliery | Little Broughton | CUL | 1921 | ||
| Outgang Opencast | CUL | ||||
| Overby No 2 Sandpit | Aikshaw | — | |||
| Oxclose Colliery | Washington | DUR | bef. 1805 | ||
| Oxhill Pit | Stanley | DUR |
