The Boring Work Preliminary to Shaft Sinking by the Freezing Process is described in connection with a New Undertaking of Londonderry Collieries Limited.
DescriptionColliery Engineering, June 1925. A DURHAM SINKING "....Two shafts having centres 66 2/3 yards apart are to be sunk each having a finished diameter of 21 ft. A preliminary borehole was drilled to prove the strata, and it was found that the Yellow Sands commenced at a depth of 445 ft. from the surface and was 40 ft. in thickness. From the outset it had been decided to adopt a freezing process, and the contract was secured by the Trefor Poring and Sinking Company, London, and the Société Franco-Belge de Fonçage, of Brussels, who are operating jointly,....."
OwnerDurham Mining Museum
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Further informationLink: http://www.dmm.org.uk/colleng/2506-01.htm
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