26 November 1846  Memorial from John Cooper possessed of a coal work called True Blue, wishing land.
True Blue close to Guinea Pit and Paragon Land Pit.

18 July 1864  True Blue, Teazeall & Prosper Free Level
Mr. Alfred James Brain, representative of deceased father Mr. Thomas Brain and Mr. Cornelius Brain, owner of the other moiety of the true Blue and Teaxeall Colliery.
T. B. Brain to surrender Prosper Free Level from midsummer 1862.

11 June 1883  Alfred James Brain time for opening True Blue to expire ëbad times in Forestí.

24 August 1887  A. J. Brain deceased.  [look in Chancery Div. High Court]

1 November 1887  Forfeited.