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No. 2,489 — ButterknowleTownship of Lynesack and Softley, Durham Sheet 41 of 19thC Ordnance Map. Lat. 54° 38' 11½", Long. 1° 50' 28½". [ OS Grid Ref: NZ 10255 26862 (410255,526862) ] Account of Strata passed through in No. 1 Bore-hole, belonging to a line of Bore-holes, put down 25 yards below the High Stile in the Old Field on the Loop Farm, to prove whether the Main Drift Brockwell Seam continued westward between two dip Faults, for the Butterknowle Colliery Company, Limited, 1898 Approximate surface level 738.57 feet above sea (Ordnance datum)
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