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Weardale Coal and Iron Co of Tudhoe, Spennymoor; also at Tow Law, Bishop Auckland.
The Weardale company controlled its own resources of iron ore, coal, and limestone.
1852 another processing plant was developed at Tudhoe near Spennymoor; the company also opened three collieries. 3000 employees.
1854 Obtained leases on ironstone deposits in the Cleveland district (later than some others)
1861 installed a set of small Bessemer converters at Tudhoe.
1858–1862 Charles Attwood experimented at Tow Law with the production of steel by melting together cast iron and refined bar iron; this work led to a patent in 1862. He was the first licensee of C. W. Siemens's regenerative gas-fired furnace applied to making steel.
1864 Because of the refusal of Baring Brothers to participate in the exploitation of his patent for a new process for casting steel, Attwood built a new factory on his own account at Wolsingham, the Stanners Closes works; this was to survive for many years within its specialized field of cast-steel articles.
1865 Attwood retired as managing partner of the Weardale company.
1866 See 1866 Cleveland Blast Furnaces for detail of furnaces at Stanhope and Towlaw.
1866 December, Mr. Dyson left the Weardale Iron Company,
1873 Reportedly built one locomotive.
1894 Royal Agricultural Show. Exhibitor (as Weardale Iron Company). 
1899 Became the Weardale Steel, Coal and Coke Co. It owned nine collieries in Durham. Annual average output in the past three years was coal 1,350,000 tons; coke 380,000 tons; steel ingots 68,200 tons; and finished iron and steel of 47,300 tons.