Dolaucothi Gold Mines: the only known Roman gold mine in Britain, now a National Trust heritage attraction open for underground guided tours in Carmarthenshire.
The Dolaucothi Gold Mines, also known as the Ogofau Gold Mine, are ancient gold mines located in the valley of the River Cothi near Pumsaint in Carmarthenshire, Wales. They are the only known Roman gold mines in Britain and the only mines for Welsh gold outside those of the Dolgellau gold-belt. Gold extraction may have begun in the Bronze Age, but the first extensive mining was carried out by the Romans from approximately AD 70–80, employing sophisticated hydraulic techniques including an aqueduct system spanning up to seven miles from the River Cothi.
A Roman military fort, Luentinum, was established near the site around AD 78. After the Roman departure the mines lay abandoned for many centuries. Mining resumed in the nineteenth century and early twentieth century under a series of companies.
Roman Deep Ltd deepened Mitchell's 1909 shaft to 480 feet in the 1930s; the mine finally closed in October 1938. It was during the 1930s operations that ancient Roman workings were rediscovered, including a fragment of a reverse overshot waterwheel now in the National Museum of Wales. The National Trust has owned the Dolaucothi Estate since 1941.
The site is a Scheduled Ancient Monument and is open for underground guided tours.
Gold extraction at Dolaucothi may have begun in the Bronze Age through washing of gold-bearing gravels from the River Cothi, the most elementary form of gold prospecting. The site is thought to date back to at least the Roman period, though no written pre-Roman evidence has been found. Archaeology suggests that gold extraction may have started sometime in the Bronze Age.
The Roman governor Sextus Julius Frontinus arrived in Roman Britain in AD 74 and established a fort at Pumsaint in west Wales to exploit the gold deposits at Dolaucothi. Extensive Roman mining commenced around AD 70–80. The Romans made use of several aqueducts and leats for hydraulic mining; the longest ran approximately seven miles from a gorge of the River Cothi to the hillsides above Pumsaint.
Smaller streams on Mynydd Mallaen, the Annell and Gwenlais, were used initially for prospecting. Water was stored in tanks and released suddenly, sweeping away soil to reveal bedrock and gold-bearing veins beneath — a technique known as hushing, described by Pliny the Elder in his Naturalis historia. The main opencast pit at the core of the Roman workings measures approximately 150 metres east–west by 100 metres north–south and reaches 24 metres deep.
The Romans followed the gold veins with shafts and tunnels, some of which still exist. The site has yielded evidence of water-powered stamp mills at Carreg Pumsaint, and a fragment of a reverse overshot dewatering wheel was found during 1930s mining operations, now held by the National Museum of Wales. The Romans also established the pool known as Melin-y-Milwyr, where Roman pottery from approximately AD 78 to at least AD 300 has been found.
A Roman military fort, Luentinum, was established at or near the present village of Pumsaint around AD 78 and was largely abandoned as a military fort around AD 125, becoming a civilian fort with evidence of continuing activity through to the late fourth century. In 1797 a farmer ploughing near the mines discovered a cache of gold items including a fragment of a Roman gold serpent-headed bracelet, now in the British Museum. After the Roman departure from Britain in the fifth century the mine lay abandoned for many centuries.
In 1844 a sample of gold ore confirmed the presence of gold at the site, contributing to a Victorian-era revival of interest. A succession of companies worked the site through the nineteenth century; details of individual operators in this period are limited in the consulted sources. Around the turn of the twentieth century, Cothy Mines sunk a shaft topped by a large wooden headframe.
The operator struck the remains of Roman workings, which had flooded centuries earlier; the cost of pumping proved too great and Cothy Mines shut down operations in 1912. In the 1930s Roman Deep Ltd was formed and began work on Mitchell's 1909 shaft. Using advances in mining technology the shaft was drained of water and steadily deepened to 480 feet (146 metres), the deepest known shaft on the site.
In 1935 during mining operations a fragment of a reverse overshot Roman dewatering water wheel was discovered; it was found with burnt timbers and is now in the National Museum of Wales. This was the most lucrative deposit worked since the Romans; the Roman Lode, a saddle reef deposit, was mined during 1935 to 1938. The company supplied a small amount of gold for the royal wedding of Prince George, Duke of Kent, to Princess Marina of Greece and Denmark.
In 1937 the company was renamed British Goldfields (No 1) Ltd; the labour force was dramatically increased to around 150–200 and several hundred tonnes of ore were extracted each week. Mining operations were brought to a halt in October 1938, with funds exhausted and the mine falling into disrepair and flooding at its lower levels. Within two years all the buildings were removed and the shafts allowed to flood.
Pumping was stopped the following year and the company was wound up in 1943. The Dolaucothi Estate, including the mines, was bequeathed to the National Trust in 1941 by descendants of the Johnes family, who had owned it since the late sixteenth century. From 1975 to 2000 the lease to the underground workings was held by Cardiff University; students from the School of Engineering were responsible for renovating the underground workings and making them safe for visitors.
Students also carried out active gold exploration using surface and underground drilling, geochemical soil sampling, and geophysics. Manchester and Cardiff Universities were active in exploring the extensive remains in the 1960s and 1970s; Lampeter University is also closely involved with the archaeology of the site. The extensive surface remains of Roman hydraulic mining were discovered only in the 1970s by intensive fieldwork and surveying.
The mine yard visible today houses metal sheds containing 1930s mining machinery sourced from the Olwyn Goch lead-zinc mine at Halkyn in North Wales, which closed in 1986 and whose equipment was transferred to Dolaucothi two years later. The site retains a 1930s headframe and mine yard. The Dolaucothi Gold Mines are a Scheduled Ancient Monument and a Site of Special Scientific Interest.
The National Trust offers underground guided tours of the Victorian Mine, the Level Mine, and a Roman Mine Trail, along with gold panning, a Field Centre, and a small museum containing finds from the Roman fort excavated in the 1980s and 1990s.