Butterley Company correspondence file on jointly working with the Staveley Coal and Iron Company to mine the coal in land owned by Lord Saville in Ollerton and Boughton Includes copies of the draft agreement and copy of minutes for a meeting between representatives from the Butterley Company and Staveley Coal & Iron Company representative (David N. Turner). With letters from the Geological Survey & Museum discussing the geology of the Mansfield coalfield. Jul 1918-Jun 1921