The colliery was one of the seven areas of deep gales - founded after the Dean Forest (Mines) Act in 1904.
[4] The purchase took place because the company was aware that the coal reserves at its Lightmoor Colliery would not last ten years, let alone the predicted twenty.
[5] Construction of the railway connection began in 1908 along with the sidings but the facilities were basic, having a two-lever ground frame allowing access to the complex.
[8] In early 1914 it was announced that Eastern was not the success everyone hoped as the western portion of the gale could not be exploited because of its geological condition.
[11] Expenditure at Eastern was made to modernise the facilities (including the repair and replacement of the boilers, the fitting of electricity and pumping equipment) and the provision of railway vehicles.