Butterley Company of Ripley, colliery owners, iron founders, mechanical engineers and brick manufacturers Coal Mining Plans, 20th cent Sheets each made up of several OS sheets 25" scale 2nd edition (1900) for the Derby, Codnor, Loscoe, Heanor, Langley Mill, Brinsley, Eastwood areas, and marked to show the progress and dates of coal workings, particularly in the Heanor and Langley areas. Each, with the exception of D2530/3 where it has probably been cut away, has a key showing the minerals belonging to Messrs Mundy and Charlton or to G N Charlton Esq and leased to the Butterley Company and the type of mineral (see below) [20th cent]