Coleford, Gloucestershire

 

Wood, coal and iron

The Forest of Dean, the area of ancient Gloucestershire woodland between the Rivers Severn and Wye, is a place of extraordinary natural beauty. Ancient trees, including oak, beech, sweet chestnut, birch, holly and various conifers, abound, while parts of the forest are rich in wild flowers and fungi. What surprises many visitors is that the region also has a rich industrial history. It was once studded with coal mines (a few were still worked when I was a boy) and places where iron ore was extracted. Because there was both iron ore and trees to make charcoal, there was a major iron-smelting industry in Roman times and in the Middle Ages, when the metal was sent to centres such as Gloucester as well as being worked locally.

In the late-18th century, iron smelters in many regions realised that coke could be a more efficient fuel for their furnaces and by the 1790s, some industrialists were making coke from the local coal and using it to smelt iron. Just outside Coleford there are the remains of a large coke-fired blast furnace that was built for smelting iron ore in 1798. Investors in the furnace included a stockbroker from London called Thomas Halford. He became unhappy with the money that iron from the furnace was making him – it took about 80 tons of iron ore and 120 tons of coke to make a mere 20 tons of pig iron. Halford began to correspond with an expert in the field, David Mushet of Derbyshire. Mushet went into partnership with Halford and by 1810 had moved to the Forest to run the furnace.

It quickly became clear to Mushet that he couldn’t make a profit from the furnace – rich as the local ore was, the Forest coal simply didn’t lend itself to coke production. Mushet sold his shares and Halford eventually went bankrupt. The ruined furnace remains, its great arch leading into a vast space where the ore was heated. The size of the structure, the very thick walls, the chunky masonry all speak of a purposeful industrial structure here among the trees. There was originally also a steam engine to pump away and send a blast of air into the furnace to keep the internal temperature high enough to melt the iron. The clanking engine, the horse-drawn tramroad bringing in coal and ore, the activity of the workmen – all of this must have made this a noisy, bustling place. It’s quiet now, with the occasional sound of traffic on the road to Coleford the loudest sound, and between the cars, the song of birds.