History
Opened 1778, the first ironworks in Monmouthshire to be fired by coke rather than charcoal. Much reconstructed in the later C19, before closure in 1882. The lease of the site was taken in 1778 by Thomas Atkinson, William Barrow, Bolton Hudson and John Sealy, London speculators. A square furnace was built of river stone, the bellows at first driven by hand, until a water wheel was set up in the Sirhowy river: this doubled the 4-6 tons (4.06-6.1 tonnes) weekly output. The early 1790s saw a slump in the industry, and the works were sold in 1794 to Matthew Monkhouse and Richard Fothergill, the latter eventually constructing tramways, and initiating the building of the Sirhowy-Newport tramroad from 1802. A second furnace was built in 1799, complete with a Boulton and Watt beam blowing engine, which provided the extra blast required when another furnace was built 1801-02. In 1818, the partnership’s lease ended, and the site was acquired much to the consternation of Richard Fothergill, by John Harford, a partner in the Ebbw Vale Ironworks. Fothergill immediately stripped the site of all moveables, but eventually was fined £6000 for his action. By 1826, two of the three furnaces were in blast, producing 7800 tons (7925.22 tonnes) of pig iron during that year, for processing at Ebbw Vale. By 1839, four furnaces were working, powered by a blowing engine from the Neath Abbey Iron Company. In 1844, the assets of the Ebbw Vale Company were put up for sale. The Sirhowy Works then consisted of five blast furnaces, four using hot blast. Each furnace could produce 90-100 tons (91.44-101.6 tonnes) of iron per week. In addition were cast-houses, bridge houses, four mine kilns, coke-yards, two limekilns, and a clay-mill. A tunnel ran through to Ebbw Vale, conveying the pig iron, and a second tunnel was under construction. The new purchasers was a partnership, including Abraham Darby and Thomas Brown. They invested heavily at the Ebbw Vale works, and probably carried out major improvements at Sirhowy. Five furnaces were in blast in the 1850s, but only three in the 1870s. The growing slump saw all three closed in 1879, with 300 people made unemployed. The works finally closed in 1882.