| Description | First half of years 1967-1971.
This volume covers a group of small mines known as the Boythorpe Group: Doe Lea Colliery, Lightwood (Handley), Newbold Colliery, Moor Side (Dent Main), Mossbrook Colliery, Plumbley Colliery, Strathfield Colliery, and Stretton Colliery. |
| Administrative History | Under Section 36 of the Coal Industry Nationalization Act 1946, which stipulated the circumstances under which the National Coal Board (NCB) would grant licences to small mines, a small mine is defined as one where 'the number of persons to be employed therein below ground is at no time likely to exceed, or greatly to exceed, thirty' or where 'coal is present amongst other minerals that appears to the Board to be of so small value that the working thereof is unlikely to be taken otherwise than as ancillary to the working of those other minerals'. |