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No. 2,483 — ButterknowleTownship of Lynesack and Softley, Durham Sheet 41 of 19thC Ordnance Map. Lat. 54° 37' 44", Long. 1° 49' 54". [ OS Grid Ref: NZ 10866 25998 (410866,525998) ] Account of Strata sunk and bored through near the South End of West Row of Coke-ovens, Butterknowle Colliery, 1868, to prove the 2 feet 7 inches Seam of Coal shown in No. 378. Commenced about 3 feet above horizon of Six Inches Seam which lies about 6 fathoms below the Brockwell Seam Approximate surface level 600 feet above sea (Ordnance datum)
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