Thorne Colliery was a large colliery within the Metropolitan Borough of Doncaster, South Yorkshire in the South Yorkshire Coalfield. The colliery was open between 1925 and 1956; but had operational issues including shaft water, war time crises and maintenance trouble, causing the pit to be non-productive for much of its lifespan. Production ended in 1958 due to geological problems. Unsuccessful proposals to restart production were made in the 1980s and 1990s, and in 2004 the pit pumps were turned off and the headgear demolished. History and description Mine construction (1902–24) Thorne Colliery is situated upon the Thorne Moors north-east of Doncaster, next to the historical mining village of Moorends, north-west to Thorne. The first experimental borings at the site began in 1902, and continued until 1908. A borehole sunk in 1904 by the Thorne Borehole Syndicate, a group of local businessmen, was proven in 1908 when the Barnsley Bed was hit at a depth of 916 yards, which was roughly thick. Sinking of Thorne pit was undertaken by firm of Pease & Partners of Darlington; Pease and Partners stated that work would commence as soon as possible once a temporary railway connection had been constructed; the company forecast production of 6,000 tons of coal per day to the surface (1.5 million p.a.); the estimated cost of the pit was £500,000 over ten years. Work on creating the pit began , but shortly afterwards pit water issues became apparent. After June 1910 the workings were inundated with water, and work was suspended whilst electric pumps were installed. Sinking eventually resumed again but there were considerable difficulties in the sinking process, which was highlighted at the Annual General Meeting of the Company in June 1911, though the proprietors remained optimistic of success. Sinking encountered problems again in 1912, causing suspension of works; it was announced that operations would only be resumed if royalty owners agreed to reduced payments. This issue meant only a few men were employed on the site at this time and sinking was again prolonged. Ground freezing was used during construction during 1913, with expectations of the work taking a further eighteen months to complete, with coal production after a further three years. In June 1914, it was announced that the future of Thorne Colliery was practically safe. The outbreak of the First World War severely impacted the construction of the pit: the German workers responsible for the freezing