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The Dolaucothi Gold Mines (; cy, Mwynfeydd Aur Dolaucothi) (), also known as the Ogofau Gold Mine, are ancient
Roman Roman or Romans most often refers to: * Rome, the capital city of Italy * Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *''Epistle to the Romans'', shortened to ''Romans'', a lett ...
surface and underground mines located in the valley of the
River Cothi The Afon Cothi ( en, River Cothy) is the largest tributary of the River Tywi in south Wales. It is noted for its trout and sea trout (sewin) fishing Fishing is the activity of trying to catch fish. Fish are often caught as wildlife from t ...
, near Pumsaint,
Carmarthenshire Carmarthenshire ( cy, Sir Gaerfyrddin; or informally ') is a county in the south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre. The county is known as ...
,
Wales Wales ( cy, Cymru ) is a country that is part of the United Kingdom. It is bordered by England to the east, the Irish Sea to the north and west, the Celtic Sea to the south west and the Bristol Channel to the south. It had a population in ...
. The gold mines are located within the
Dolaucothi Estate The Dolaucothi Estate (''also'' Dolaucothy) is situated about north-west of the village of Caio up the picturesque Cothi Valley in the community of Cynwyl Gaeo, in Carmarthenshire, Wales. Its name of ''Dolaucothi'' means ‘the meadows of the ...
which is now owned by the
National Trust The National Trust, formally the National Trust for Places of Historic Interest or Natural Beauty, is a charity and membership organisation for heritage conservation in England, Wales and Northern Ireland. In Scotland, there is a separate and ...
. They are the only mines for
Welsh gold Welsh gold is gold that occurs naturally in two distinct areas of Wales and highly prized because of its origin and scarcity. One area it is found in is north Wales in a band stretching from Barmouth, past Dolgellau and up towards Snowdonia. ...
outside those of the
Dolgellau Dolgellau () is a town and Community (Wales), community in Gwynedd, north-west Wales, lying on the River Wnion, a tributary of the River Mawddach. It was the traditional county town of the Historic counties of Wales, historic county of Merionet ...
gold-belt, and are a
Scheduled Ancient Monument In the United Kingdom, a scheduled monument is a nationally important archaeological site or historic building, given protection against unauthorised change. The various pieces of legislation that legally protect heritage assets from damage and d ...
. They are also the only known Roman gold mines in Britain, although it does not exclude the likelihood that they exploited other known sources in
Devon Devon ( , historically known as Devonshire , ) is a ceremonial and non-metropolitan county in South West England. The most populous settlement in Devon is the city of Plymouth, followed by Devon's county town, the city of Exeter. Devo ...
in South West
England England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea to the southwest. It is separated from continental Europe ...
,
north Wales North Wales ( cy, Gogledd Cymru) is a regions of Wales, region of Wales, encompassing its northernmost areas. It borders Mid Wales to the south, England to the east, and the Irish Sea to the north and west. The area is highly mountainous and rural, ...
,
Scotland Scotland (, ) is a country that is part of the United Kingdom. Covering the northern third of the island of Great Britain, mainland Scotland has a border with England to the southeast and is otherwise surrounded by the Atlantic Ocean to ...
and elsewhere. The site is important for showing advanced Roman technology.


Roman mining methods

Archaeology Archaeology or archeology is the scientific study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, sites, and cultural landsc ...
suggests that
gold Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile ...
extraction on this site may have started sometime in the
Bronze Age The Bronze Age is a historic period, lasting approximately from 3300 BC to 1200 BC, characterized by the use of bronze, the presence of writing in some areas, and other early features of urban civilization. The Bronze Age is the second pri ...
, possibly by washing of the gold-bearing gravels of the river Cothi, the most elementary type of
gold prospecting Gold prospecting is the act of searching for new gold deposits. Methods used vary with the type of deposit sought and the resources of the prospector. Although traditionally a commercial activity, in some developed countries placer gold prosp ...
.
Sextus Julius Frontinus Sextus Julius Frontinus (c. 40 – 103 AD) was a prominent Roman civil engineer, author, soldier and senator of the late 1st century AD. He was a successful general under Domitian, commanding forces in Roman Britain, and on the Rhine and Danube ...
was sent into
Roman Britain Roman Britain was the period in classical antiquity when large parts of the island of Great Britain were under occupation by the Roman Empire. The occupation lasted from AD 43 to AD 410. During that time, the territory conquered wa ...
in AD 74 to succeed
Quintus Petillius Cerialis Quintus Petillius Cerialis Caesius Rufus ( AD 30 — after AD 83), otherwise known as Quintus Petillius Cerialis, was a Roman general and administrator who served in Britain during Boudica's rebellion and went on to participate in the civil wars a ...
as governor of that island. He subdued the
Silures The Silures ( , ) were a powerful and warlike tribe or tribal confederation of ancient Britain, occupying what is now south east Wales and perhaps some adjoining areas. They were bordered to the north by the Ordovices; to the east by the Dobun ...
, Demetae and other hostile tribes of Roman Wales, establishing a new base at
Caerleon Caerleon (; cy, Caerllion) is a town and community in Newport, Wales. Situated on the River Usk, it lies northeast of Newport city centre, and southeast of Cwmbran. Caerleon is of archaeological importance, being the site of a notable Roman ...
for
Legio II Augusta Legio II Augusta ( Second Legion "Augustus'") was a legion of the Imperial Roman army that was founded during the late Roman republic. Its emblems were the Capricornus, Pegasus, and Mars. It may have taken the name "''Augusta''" from a victory ...
and a network of smaller
Roman fort In the Roman Republic and the Roman Empire, the Latin word ''castrum'', plural ''castra'', was a military-related term. In Latin usage, the singular form ''castrum'' meant 'fort', while the plural form ''castra'' meant 'camp'. The singular and ...
s fifteen to twenty kilometres apart for his
Roman auxiliary The (, lit. "auxiliaries") were introduced as non-citizen troops attached to the citizen legions by Augustus after his reorganisation of the Imperial Roman army from 30 BC. By the 2nd century, the Auxilia contained the same number of in ...
units. During his tenure, he probably established the fort at Pumsaint in west Wales, largely to exploit the gold deposits at Dolaucothi.
Frontinus Sextus Julius Frontinus (c. 40 – 103 AD) was a prominent Roman civil engineer, author, soldier and senator of the late 1st century AD. He was a successful general under Domitian, commanding forces in Roman Britain, and on the Rhine and Danube ...
later restored the
aqueducts of Rome The Romans constructed aqueducts throughout their Republic and later Empire, to bring water from outside sources into cities and towns. Aqueduct water supplied public baths, latrines, fountains, and private households; it also supported mining o ...
and wrote the definitive treatise on 1st century Roman aqueducts, the two-volume '' De aquaeductu''. That gold occurred here is shown by the discovery of a
hoard A hoard or "wealth deposit" is an archaeological term for a collection of valuable objects or artifacts, sometimes purposely buried in the ground, in which case it is sometimes also known as a cache. This would usually be with the intention of ...
of gold ornaments in the 18th century. Objects found included a wheel brooch and snake bracelets, so named because they were soft enough to be coiled around the arm for display. All the objects are now held in the
British Museum The British Museum is a public museum dedicated to human history, art and culture located in the Bloomsbury area of London. Its permanent collection of eight million works is among the largest and most comprehensive in existence. It docum ...
, and displayed in the Romano-British gallery. A sample of gold ore was found at the site by
Henry De la Beche Sir Henry Thomas De la Beche KCB, FRS (10 February 179613 April 1855) was an English geologist and palaeontologist, the first director of the Geological Survey of Great Britain, who helped pioneer early geological survey methods. He was the ...
in 1844, confirming the presence of gold. Evidence from the fortification (known as Luentinum from details given in
Ptolemy Claudius Ptolemy (; grc-gre, Πτολεμαῖος, ; la, Claudius Ptolemaeus; AD) was a mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importanc ...
's ''
Geographia The ''Geography'' ( grc-gre, Γεωγραφικὴ Ὑφήγησις, ''Geōgraphikḕ Hyphḗgēsis'',  "Geographical Guidance"), also known by its Latin names as the ' and the ', is a gazetteer, an atlas, and a treatise on cartography, com ...
'') and its associated
settlement Settlement may refer to: * Human settlement, a community where people live *Settlement (structural), the distortion or disruption of parts of a building *Closing (real estate), the final step in executing a real estate transaction *Settlement (fin ...
show that the Roman army occupied the fort from to . However, coarse ware and Samian ware pottery recovered from a reservoir (Melin-y-Milwyr) within the mine complex show that activity at the mines continued until the late 3rd century at least. Since Ptolemy's map dates to about 150, it is likely that it continued being worked until the end of the 3rd century if not beyond.


Hydraulic mining

The Romans made extensive use of water carried by several aqueducts and
leat A leat (; also lete or leet, or millstream) is the name, common in the south and west of England and in Wales, for an artificial watercourse or aqueduct dug into the ground, especially one supplying water to a watermill or its mill pond. Othe ...
s, the longest of which is about from its source in a gorge of the river, to prospect for the gold veins hidden beneath the soil on the hillsides above the modern village of Pumsaint. Small streams on Mynydd Mallaen, the Annell and Gwenlais, were used initially to provide water for prospecting, and there are several large tanks for holding the water still visible above an isolated opencast pit carved in the side of the hill north of the main site. The larger aqueduct from the Cothi crosses this opencast, proving the opencast to be earlier. The water was stored in the tanks and then released suddenly, the wave of water sweeping away the soil to reveal the bedrock and any gold-bearing veins beneath.
Pliny the Elder Gaius Plinius Secundus (AD 23/2479), called Pliny the Elder (), was a Roman author, naturalist and natural philosopher, and naval and army commander of the early Roman Empire, and a friend of the emperor Vespasian. He wrote the encyclopedic ' ...
gives a dramatic account in his ''
Naturalis historia The ''Natural History'' ( la, Naturalis historia) is a work by Pliny the Elder. The largest single work to have survived from the Roman Empire to the modern day, the ''Natural History'' compiles information gleaned from other ancient authors. ...
'' of the method, possibly derived from his experiences in Spain. The method is known as
hushing Hushing is an ancient and historic mining method using a flood or torrent of water to reveal mineral veins. The method was applied in several ways, both in prospecting for ores, and for their exploitation. Mineral veins are often hidden below ...
and survived in use until the 19th century in Britain, and into the 20th century in the goldfields of
Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...
. A not dissimilar method is used today in exploiting alluvial tin deposits, and is known as
hydraulic mining Hydraulic mining is a form of mining that uses high-pressure jets of water to dislodge rock material or move sediment.Paul W. Thrush, ''A Dictionary of Mining, Mineral, and Related Terms'', US Bureau of Mines, 1968, p.560. In the placer mining of ...
. A smaller scale version of the same method is
placer mining Placer mining () is the mining of stream bed ( alluvial) deposits for minerals. This may be done by open-pit (also called open-cast mining) or by various surface excavating equipment or tunneling equipment. Placer mining is frequently used fo ...
, and both may have been used to work alluvial
placer deposit In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. The name is from the Spanish word ''placer'', meaning "alluvial sand". Placer mi ...
s next to the river Cothi itself, judging by a large aqueduct which tapped the river a mile or so upstream, and enters the site at a low level compared with the other known aqueducts on the site. The water supply of the aqueducts was also used for washing crushed gold ore, and also possibly driving stamping mills for
comminution Comminution is the reduction of solid materials from one average particle size to a smaller average particle size, by crushing, grinding, cutting, vibrating, or other processes. In geology, it occurs naturally during faulting in the upper part ...
of the ore (Lewis and Jones, 1969). One of the first aqueducts was built at a high level on the east slope of Allt Cwmhenog and tapped a small stream about away. There is a large tank at its end, where it sweeps around the brow of the hill onto the west side of the ridge. A gold vein must have been discovered here, because there is a large opencast below the tank. Yet the larger and longer aqueduct (with a
gradient In vector calculus, the gradient of a scalar-valued differentiable function of several variables is the vector field (or vector-valued function) \nabla f whose value at a point p is the "direction and rate of fastest increase". If the gr ...
of 1 in 800) taps the
River Cothi The Afon Cothi ( en, River Cothy) is the largest tributary of the River Tywi in south Wales. It is noted for its trout and sea trout (sewin) fishing Fishing is the activity of trying to catch fish. Fish are often caught as wildlife from t ...
about to the north-east and traverses the same opencast, so must be later in date. By contrast, several tanks found on the site did not show a vein, so were abandoned. The tank shown at right occurs not far from the north opencast and was probably intended to find the limits of the deposit located in the adjacent opencast (Tank A in the schematic diagram below). It clearly didn't find the vein, and was thus abandoned. The water supply may have been obtained from a small
leat A leat (; also lete or leet, or millstream) is the name, common in the south and west of England and in Wales, for an artificial watercourse or aqueduct dug into the ground, especially one supplying water to a watermill or its mill pond. Othe ...
run from a stream up the main Cothi valley before the much larger aqueduct was constructed.


Opencast mining

Prospecting was successful and several opencasts are visible below the large tanks built along its length. The only exception is the final and very large tank, below which are two reservoirs. It is likely that this complex was used for washing powdered ore to collect the gold dust. More
leat A leat (; also lete or leet, or millstream) is the name, common in the south and west of England and in Wales, for an artificial watercourse or aqueduct dug into the ground, especially one supplying water to a watermill or its mill pond. Othe ...
s and tanks can be found below the line of the main aqueduct, some of which are shown on the map of the site. They surround the lip of the very large opencast and the tank shown at right is one which was built on the main aqueduct. It was successful in finding a vein, judging by the opencast below, but must have been modified later to feed a washing table built to the left-hand side (near the figure in the picture), probably to wash the crushed ore from the same opencast working. It is labelled Tank C in the schematic diagram. Similar tanks occur below as the Romans followed the large vein down to the road and the main opencast. Most of the opencast workings must therefore be Roman in origin, since one of the aqueducts has been confirmed by
carbon 14 dating Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was dev ...
as to predate all modern workings. Just by the road itself the Carreg Pumsaint has been erected in the space beside a large mound, now thought to be a dump of waste material from mining activities. The existing ponds above and below the minor road from Pumsaint to Caeo, were probably part of a cascade for washing ore, the upper tank having yielded large quantities of Roman pottery from to at least 300 (Lewis, 1977; Burnham 2004). The upper pool is known as Melin-y-Milwyr, or the soldiers' mill, an intriguing name that implies that watermills may have been used here during the Roman period. Alternatively, it may have been a sequence of washing tables for the crushed gold ore. A large-scale mill complex is known from Barbegal in southern
France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...
, where no less than 16 mills (in two lines of 8 each) were built into the side of a hill and supplied with water from a single aqueduct. There were two lines of parallel overshot mills, the outflow from one feeding the next below. The mill supplied flour to the region. Moreover, Roman engineers used sequences of
reverse overshot water-wheel Frequently used in mines and probably elsewhere (such as agricultural drainage), the reverse overshot water wheel was a Roman innovation to help remove water from the lowest levels of underground workings. It is described by Vitruvius in his work ' ...
s to dewater mines, and the deep workings at Dolaucothi produced a fragment of such a wheel during the 1930s when deep mining operations were resumed. Sequences of such wheels increased the lift, and one extensive sequence of 16 wheels was found in old Roman mine workings on the Rio Tinto river in the 1920s. The wheels were arranged in pairs and could lift water about from the bottom of the mine there.


Melin-y-Milwyr

The tank at the head of the small road from Pumsaint to Caio was thought to be modern since it still holds water. However, when the level of the water was low in 1970, it yielded large quantities of Roman pottery which show that it is of Roman origin and built early during their exploitation of the mines. The section shows that it was connected to a smaller tank just below the modern road by a drystone culvert in a cascade. The lower tank also holds water but is in an advanced state of
eutrophication Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients, particularly nitrogen and phosphorus. It has also been defined as "nutrient-induced increase in phyt ...
. The collection of fragments included Samian ware and coarse ware from over 100 separate pots, and must have fallen into the reservoir when the mines were in full operation. Analysis of the pottery fragments showed a distribution of ages from the late 1st century AD through to the end of the 4th century. Since the fort and fortlet under the present village of Pumsaint ends in the middle of the 2nd century, it shows that mining continued for a long time after the military evacuation. It implies that there is a large mining settlement in the vicinity of the village of Pumsaint which has yet to be found. The exact function of the cascade is related to the methods of extracting the final traces of gold from the crushed ore. There were probably washing tables between the two tanks so that a gentle stream of water could be used to wash the ore on the rough surface of the tables, the finer gold being caught in the rougher parts of the tables, and removed at the end of the process. The cascade would probably have been built towards the end of the 1st century when underground mining commenced following opencast development.


Carreg Pumsaint

This site yields some of the earliest evidence anywhere for the Roman use of water-powered
trip hammer A trip hammer, also known as a tilt hammer or helve hammer, is a massive powered hammer. Traditional uses of trip hammers include pounding, wikt:decorticate, decorticating and polishing of grain in agriculture. In mining, trip hammers were used f ...
s to crush ore (Burnham 1997). The ore was probably crushed on the famous Carreg Pumsaint, a block of stone erected many years ago before the Romans had left the site. There are parallels with similar stones at other ancient Roman mines in Europe, and the hollows in the block were formed by a trip hammer probably worked by a
water wheel A water wheel is a machine for converting the energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a wheel (usually constructed from wood or metal), with a number of blades or buckets ...
or a "water lever". Such a water-powered hammer would have been moved regularly as each hollow became too deep, so producing the series of overlapping oval hollows in its surfaces. The hammer head must have been of substantial size judging by the width of the hollows shown in the drawing. The stone is the only example so far discovered at the site, but is not unique, and Burnham refers to others of similar shape from Spain. As one side of the stone became worn, it was simply turned to reveal another side, so the block could be re-used several times. When found years after the Romans had left, in the Dark Ages, it gave rise to the legend of the five saints, who left the impression of their heads in the stone after being found asleep by the devil.


Deep mining

They followed the veins with shafts and tunnels, some of which still exist on the site. The remains of Roman dewatering machines were found during the 1880s and the 1920s when the Rio Tinto mines in Spain were being mined by opencast methods. At Dolaucothi, a similar discovery was made in 1935 during mining operations, and it included part of a
reverse overshot water wheel Frequently used in mines and probably elsewhere (such as agricultural drainage), the reverse overshot water wheel was a Roman innovation to help remove water from the lowest levels of underground workings. It is described by Vitruvius in his work ' ...
which is now in the
National Museum of Wales National may refer to: Common uses * Nation or country ** Nationality – a ''national'' is a person who is subject to a nation, regardless of whether the person has full rights as a citizen Places in the United States * National, Maryland, c ...
. It was found with burnt timbers, suggesting that fire-setting was used to help break up the hard quartz in which the gold was trapped. A similar but larger wheel was rediscovered during mine operations at
Rio Tinto Rio Tinto, meaning "red river", may refer to: Businesses * Rio Tinto (corporation), an Anglo-Australian multinational mining and resources corporation ** Rio Tinto Alcan, based in Canada ** Rio Tinto Borax in America *** Rio Tinto Borax Mine, ...
in
Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = '' Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , ...
, and is now in the
British Museum The British Museum is a public museum dedicated to human history, art and culture located in the Bloomsbury area of London. Its permanent collection of eight million works is among the largest and most comprehensive in existence. It docum ...
, where it is displayed prominently in the Roman gallery. The Spanish example included a sequence of no fewer than 16
reverse overshot water wheel Frequently used in mines and probably elsewhere (such as agricultural drainage), the reverse overshot water wheel was a Roman innovation to help remove water from the lowest levels of underground workings. It is described by Vitruvius in his work ' ...
s, each pair of wheels feeding water to the next set in the sequence. Each wheel would have been worked like a
treadwheel A treadwheel, or treadmill, is a form of engine typically powered by humans. It may resemble a water wheel in appearance, and can be worked either by a human treading paddles set into its circumference (treadmill), or by a human or animal standing ...
, from the side rather than at the top, but it would have been a hard and lonely activity for the miners working these wheels lifting water from the mine bottom. Since the fragment of a reverse overshot water wheel was found 160 feet below any known
adit An adit (from Latin ''aditus'', entrance) is an entrance to an underground mine which is horizontal or nearly horizontal, by which the mine can be entered, drained of water, ventilated, and minerals extracted at the lowest convenient level. Adit ...
or stope, it must have been part of a similar sequence at Dolaucothi to that in Spain.
Gold mining Gold mining is the extraction of gold resources by mining. Historically, mining gold from alluvial deposits used manual separation processes, such as gold panning. However, with the expansion of gold mining to ores that are not on the surface, ...
was sophisticated and technologically advanced at Dolaucothi, suggesting that the
Roman army The Roman army (Latin: ) was the armed forces deployed by the Romans throughout the duration of Ancient Rome, from the Roman Kingdom (c. 500 BC) to the Roman Republic (500–31 BC) and the Roman Empire (31 BC–395 AD), and its medieval contin ...
itself pioneered exploitation at the site. The construction of such dewatering machines is described by the Roman engineer
Vitruvius Vitruvius (; c. 80–70 BC – after c. 15 BC) was a Roman architect and engineer during the 1st century BC, known for his multi-volume work entitled '' De architectura''. He originated the idea that all buildings should have three attribut ...
writing in 25 BC, and their use for
irrigation Irrigation (also referred to as watering) is the practice of applying controlled amounts of water to land to help grow crops, landscape plants, and lawns. Irrigation has been a key aspect of agriculture for over 5,000 years and has been devel ...
and lifting water in
thermae In ancient Rome, (from Greek , "hot") and (from Greek ) were facilities for bathing. usually refers to the large imperial bath complexes, while were smaller-scale facilities, public or private, that existed in great numbers throughout ...
was widespread. At another part of the mine, on Penlan-wen, water would have been in short supply; a siphon could have transferred water from the main aqueduct or one of its tanks, but remains unproven. The vein carries along the hill for some considerable distance, and has been trenched out. This method involved excavating the vein vertically down while keeping the top open. However, ventilation becomes a problem when fire-setting is used, so three long adits were driven in from the hillside to the north. They are much wider than normal galleries, suggesting that their primary purpose was to allow circulation of air through the trench and permit safe fire-setting. The upper two
adit An adit (from Latin ''aditus'', entrance) is an entrance to an underground mine which is horizontal or nearly horizontal, by which the mine can be entered, drained of water, ventilated, and minerals extracted at the lowest convenient level. Adit ...
s are still open to the trench, but the lowest one is currently blocked.


Similar sites

Although there is nothing directly comparable with Dolaucothi in Britain in terms of the extensive hydraulic systems, there are many other known Roman mines in Britain, some of which seem to show traces of hydraulic activity. They include the extensive remains of
lead Lead is a chemical element with the symbol Pb (from the Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, ...
mining at Charterhouse in the
Mendips The Mendip Hills (commonly called the Mendips) is a range of limestone hills to the south of Bristol and Bath in Somerset, England. Running from Weston-super-Mare and the Bristol Channel in the west to the Frome valley in the east, the hills ...
, Halkyn in
Flintshire , settlement_type = County , image_skyline = , image_alt = , image_caption = , image_flag = , image_shield = Arms of Flint ...
, and many areas in the
Pennines The Pennines (), also known as the Pennine Chain or Pennine Hills, are a range of uplands running between three regions of Northern England: North West England on the west, North East England and Yorkshire and the Humber on the east. Common ...
. Dolaucothi is most directly comparable with gold mines in the
Carpathian mountains The Carpathian Mountains or Carpathians () are a range of mountains forming an arc across Central Europe. Roughly long, it is the third-longest European mountain range after the Urals at and the Scandinavian Mountains at . The range stretche ...
of
Transylvania Transylvania ( ro, Ardeal or ; hu, Erdély; german: Siebenbürgen) is a historical and cultural region in Central Europe, encompassing central Romania. To the east and south its natural border is the Carpathian Mountains, and to the west the A ...
in modern
Romania Romania ( ; ro, România ) is a country located at the crossroads of Central Europe, Central, Eastern Europe, Eastern, and Southeast Europe, Southeastern Europe. It borders Bulgaria to the south, Ukraine to the north, Hungary to the west, S ...
, at
Rosia Montana Rosia may refer to: *Rosia, the Greek name for Rus' (region) *Rosia, Sovicille, a village in Tuscany, Italy *Roșia (disambiguation), villages in Romania *Roșia Montană, a commune in Romania *Roșia, a tributary of the river Dorna in Romania *Ro ...
, and with the Roman gold mines in north-west
Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = '' Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , ...
, such as the very much larger site of alluvial mining at
Las Médulas Las Médulas () is a historic gold-mining site near the town of Ponferrada in the comarca of El Bierzo (province of León, Castile and León, Spain). It was the most important gold mine, as well as the largest open-pit gold mine in the entire ...
and Montefurado. The Romans may have used
slave labour Slavery and enslavement are both the state and the condition of being a slave—someone forbidden to quit one's service for an enslaver, and who is treated by the enslaver as property. Slavery typically involves slaves being made to per ...
taken from the local area to work the mine, although the army itself was probably most directly involved, especially for their engineering skills in surveying and building aqueducts,
reservoirs A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including control ...
and water tanks or
cistern A cistern (Middle English ', from Latin ', from ', "box", from Greek ', "basket") is a waterproof receptacle for holding liquids, usually water. Cisterns are often built to catch and store rainwater. Cisterns are distinguished from wells by ...
s. There is some evidence that some of the
gold Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile ...
was worked at the site, judging by the finished brooch shown above, as well as other finished gold products. A part engraved jewel has also been found in the vicinity. Such activities would have needed skilled, not slave labour. No workshops or furnaces have yet been found, but it is likely that both existed on site. Ingots of gold would have been easier to transport than dust or nuggets, although a high-temperature
refractory In materials science, a refractory material or refractory is a material that is resistant to decomposition by heat, pressure, or chemical attack, and retains strength and form at high temperatures. Refractories are polycrystalline, polyphase, ...
furnace will have been needed to melt the gold, which has a
melting point The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depen ...
of . Pliny mentions such special furnaces in his ''
Naturalis historia The ''Natural History'' ( la, Naturalis historia) is a work by Pliny the Elder. The largest single work to have survived from the Roman Empire to the modern day, the ''Natural History'' compiles information gleaned from other ancient authors. ...
''. A
workshop Beginning with the Industrial Revolution era, a workshop may be a room, rooms or building which provides both the area and tools (or machinery) that may be required for the manufacture or repair of manufactured goods. Workshops were the ...
will have been vital for building and maintaining mining equipment such as the drainage wheels,
flume A flume is a human-made channel for water, in the form of an open declined gravity chute whose walls are raised above the surrounding terrain, in contrast to a trench or ditch. Flumes are not to be confused with aqueducts, which are built to t ...
s for washing tables, shuttering for aqueducts, crushing equipment and pit-props. Official mints would have produced
gold coin A gold coin is a coin that is made mostly or entirely of gold. Most gold coins minted since 1800 are 90–92% gold (22karat), while most of today's gold bullion coins are pure gold, such as the Britannia, Canadian Maple Leaf, and American Buf ...
s, a key component of
Roman currency Roman currency for most of Roman history consisted of gold, silver, bronze, orichalcum and copper coinage. From its introduction to the Republic, during the third century BC, well into Imperial times, Roman currency saw many changes in form, denom ...
. After the military occupation the mine may have been taken over by
Romano-British The Romano-British culture arose in Britain under the Roman Empire following the Roman conquest in AD 43 and the creation of the province of Britannia. It arose as a fusion of the imported Roman culture with that of the indigenous Britons, ...
civilian contractors some time after 125, although the final history of the site has yet to be determined.


Later history

Following the
Roman departure from Britain The end of Roman rule in Britain was the transition from Roman Britain to post-Roman Britain. Roman rule ended in different parts of Britain at different times, and under different circumstances. In 383, the usurper Magnus Maximus withdrew tr ...
in the 5th century, the mine lay abandoned for centuries. There was a revival in the 19th century and attempts to make successful ventures at the site in the early 20th century, but they were abandoned before the First World War. In the 1930s a shaft was sunk to in an attempt to locate new seams. Falling into disrepair and unsafe due to flooding at its lower levels, the mine finally closed in 1938. It was during this period that ancient underground workings were found, and the fragment of the dewatering mill discovered within. The extensive surface remains, especially the traces of hydraulic mining, were to be discovered only in the 1970s by intensive fieldwork and surveying. Between 1975 and 2000 the lease to the underground workings at Dolaucothi was held by
Cardiff University , latin_name = , image_name = Shield of the University of Cardiff.svg , image_size = 150px , caption = Coat of arms of Cardiff University , motto = cy, Gwirionedd, Undod a Chytgord , mottoeng = Truth, Unity and Concord , established = 1 ...
. Students from the School of Engineering were largely responsible for the renovation of the underground workings that were made safe for tourists. The mine was extensively used as a training mine for Mining Engineering and Exploration Geology students under the supervision of Alun Isaac, Alwyn Annels and Peter Brabham. Students from the School of Earth Sciences carried out an active gold exploration programme using surface and underground diamond drilling techniques, geochemical soil sampling and geophysics. Geological exploration was carried out by students using both surface and underground drilling methods. The ore processing waste tailings dam was also sampled, mapped geophysically and assessed for its Gold potential. The mine was extensively mapped and a library of Dolaucothi data is still held at the School of Earth & Ocean Sciences at Cardiff University. Cardiff University finally gave up the lease to the underground workings in 2000 due to the closure of its BSc Mining Engineering degree course. Photographs of surface and underground activities from the Cardiff University archives can be found from the links below. Although there is yet no comparable site in Britain, it is likely that field work will locate other mines, simply by tracing the remains of aqueducts and reservoirs, and often, if not usually, aided by
aerial photography Aerial photography (or airborne imagery) is the taking of photographs from an aircraft or other airborne platforms. When taking motion pictures, it is also known as aerial videography. Platforms for aerial photography include fixed-wing airc ...
. Physical remains like tanks and aqueducts are often recognised by the shadows cast by the structures in oblique lighting conditions. Thus Tank A was first seen in early morning light when the sun's rays cast an oblique light across the hill (Allt Cwmhenog) on which the structure is situated.


Other local mines

The
lead Lead is a chemical element with the symbol Pb (from the Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, ...
mines of Nantymwyn near Rhandirmwyn village some to the north may also have been first worked by the Romans, judging by
hushing Hushing is an ancient and historic mining method using a flood or torrent of water to reveal mineral veins. The method was applied in several ways, both in prospecting for ores, and for their exploitation. Mineral veins are often hidden below ...
tanks and aqueducts found there in the 1970s both from fieldwork and aerial photographs. They occur at the top of the mountain called Pencerrig-mwyn, and the veins were followed underground by several tunnels leading to the workings. Inside, the veins have been removed and debris carefully stacked within the stope. The workings lie far above the later modern mines and processing plant (now derelict). The later mine was once the largest lead mine in Wales.


Other local sites

There are
Roman fort In the Roman Republic and the Roman Empire, the Latin word ''castrum'', plural ''castra'', was a military-related term. In Latin usage, the singular form ''castrum'' meant 'fort', while the plural form ''castra'' meant 'camp'. The singular and ...
s at
Llandovery Llandovery (; cy, Llanymddyfri ) is a market town and community in Carmarthenshire, Wales. It lies on the River Tywi and at the junction of the A40 and A483 roads, about north-east of Carmarthen, north of Swansea and west of Brecon. Hi ...
and Bremia near Llanio, and as of 2003, in
Llandeilo Llandeilo () is a town and community in Carmarthenshire, Wales, situated at the crossing of the River Towy by the A483 on a 19th-century stone bridge. Its population was 1,795 at the 2011 Census. It is adjacent to the westernmost point of the ...
.


National Trust

The
National Trust The National Trust, formally the National Trust for Places of Historic Interest or Natural Beauty, is a charity and membership organisation for heritage conservation in England, Wales and Northern Ireland. In Scotland, there is a separate and ...
has owned and run the Dolaucothi gold mine and
Dolaucothi Estate The Dolaucothi Estate (''also'' Dolaucothy) is situated about north-west of the village of Caio up the picturesque Cothi Valley in the community of Cynwyl Gaeo, in Carmarthenshire, Wales. Its name of ''Dolaucothi'' means ‘the meadows of the ...
since 1941 when it was bequeathed by descendants of the Johnes family who had owned the mine and large surrounding estate since the late 16th century. The
University of Manchester The University of Manchester is a public university, public research university in Manchester, England. The main campus is south of Manchester city centre, Manchester City Centre on Wilmslow Road, Oxford Road. The university owns and operates majo ...
and University of Cardiff were active in exploring the extensive remains in the 1960s and 1970s and
Lampeter University University of Wales, Lampeter ( cy, Prifysgol Cymru, Llanbedr Pont Steffan) was a university in Lampeter, Wales. Founded in 1822, and incorporated by royal charter in 1828, it was the oldest degree awarding institution in Wales, with limited ...
is now closely involved with the
archaeology Archaeology or archeology is the scientific study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifacts, architecture, biofacts or ecofacts, sites, and cultural landsc ...
of the site. The National Trust organises guided tours for visitors, showing them the mine and the Roman archaeology.


See also

*
Aerial archaeology Aerial archaeology is the study of archaeological remains by examining them from a higher altitude. In present day, this is usually achieved by satellite images or through the use of drones. Details Aerial Archaeology involves interpretation an ...
* ''
De architectura (''On architecture'', published as ''Ten Books on Architecture'') is a treatise on architecture written by the Roman architect and military engineer Marcus Vitruvius Pollio and dedicated to his patron, the emperor Caesar Augustus, as a guide ...
'' * '' De re metallica'' *
Dolaucothi Estate The Dolaucothi Estate (''also'' Dolaucothy) is situated about north-west of the village of Caio up the picturesque Cothi Valley in the community of Cynwyl Gaeo, in Carmarthenshire, Wales. Its name of ''Dolaucothi'' means ‘the meadows of the ...
* Fire-setting *
Georg Agricola Georgius Agricola (; born Georg Pawer or Georg Bauer; 24 March 1494 – 21 November 1555) was a German Humanist scholar, mineralogist and metallurgist. Born in the small town of Glauchau, in the Electorate of Saxony of the Holy Roman Empir ...
*
Gold mining Gold mining is the extraction of gold resources by mining. Historically, mining gold from alluvial deposits used manual separation processes, such as gold panning. However, with the expansion of gold mining to ores that are not on the surface, ...
* Gold extraction *
Gold prospecting Gold prospecting is the act of searching for new gold deposits. Methods used vary with the type of deposit sought and the resources of the prospector. Although traditionally a commercial activity, in some developed countries placer gold prosp ...
*
Hushing Hushing is an ancient and historic mining method using a flood or torrent of water to reveal mineral veins. The method was applied in several ways, both in prospecting for ores, and for their exploitation. Mineral veins are often hidden below ...
* Mining archaeology in British Isles *
Mining in Roman Britain Mining was one of the most prosperous activities in Roman Britain. Britain was rich in resources such as copper, gold, iron, lead, salt, silver, and tin, materials in high demand in the Roman Empire. Sufficient supply of metals was needed to fulfil ...
*
River Cothi The Afon Cothi ( en, River Cothy) is the largest tributary of the River Tywi in south Wales. It is noted for its trout and sea trout (sewin) fishing Fishing is the activity of trying to catch fish. Fish are often caught as wildlife from t ...
*
Roman aqueducts The Romans constructed aqueducts throughout their Republic and later Empire, to bring water from outside sources into cities and towns. Aqueduct water supplied public baths, latrines, fountains, and private households; it also supported mining ...
*
Roman engineering The ancient Romans were famous for their advanced engineering accomplishments. Technology for bringing running water into cities was developed in the east, but transformed by the Romans into a technology inconceivable in Greece. The architecture ...
* Roman mining * Roman technology *
Welsh gold Welsh gold is gold that occurs naturally in two distinct areas of Wales and highly prized because of its origin and scarcity. One area it is found in is north Wales in a band stretching from Barmouth, past Dolgellau and up towards Snowdonia. ...


References

*Boon, G. C. and Williams, C. ''The Dolaucothi Drainage Wheel'', Journal of Roman Studies, 56 (1966), 122–127. *Davies O., ''Roman Mines in Europe'', Clarendon Press (Oxford), 1935. *Jones G. D. B., I. J. Blakey, and E. C. F. MacPherson, ''Dolaucothi: the Roman aqueduct'', Bulletin of the Board of Celtic Studies 19 (1960): 71-84 and plates III-V. *Lewis, P. R. and G. D. B. Jones, ''The Dolaucothi gold mines, I: the surface evidence'', The Antiquaries Journal, 49, no. 2 (1969): 244–72. *Lewis, P. R. and G. D. B. Jones, ''Roman gold-mining in north-west Spain'', Journal of Roman Studies 60 (1970): 169–85. *Jones, R. F. J. and Bird, D. G., ''Roman gold-mining in north-west Spain, II: Workings on the Rio Duerna'', Journal of Roman Studies 62 (1972): 59–74. *Lewis, P. R., ''The Ogofau Roman gold mines at Dolaucothi'', The National Trust Year Book 1976-77 (1977). *Annels, A and Burnham, BC, ''The Dolaucothi Gold Mines'', University of Wales, Cardiff, 3rd Ed (1995). *Burnham, Barry C. "Roman Mining at Dolaucothi: the Implications of the 1991-3 Excavations near the Carreg Pumsaint", ''Britannia'' 28 (1997), 325-336 *Hodge, A.T. (2001). ''Roman Aqueducts & Water Supply'', 2nd ed. London: Duckworth. *Burnham, BC and H, ''Dolaucothi-Pumsaint: Survey and Excavation at a Roman Gold-mining complex (1987-1999)'', Oxbow Books (2004). *Timberlake, S, ''Early leats and hushing remains: suggestions and disputes for roman mining and prospection for lead'', Bulletin of the Peak District mines Historical Society, 15 (2004), 64 ff.


External links


A set of Dolaucothi photographic images by Dr Peter Brabham of Cardiff UniversityDolaucothi Gold Mines information at the National Trust
* ttps://web.archive.org/web/20071119123113/http://www.gtj.org.uk/ Cultural jewels of Wales (under metal mining and manufacturing)br>Early referenceSpanish site dedicated to Roman technology, especially aqueducts and minesLas Médulas (Spain). Largest Roman gold mineRoman lead mines and later mines near Dolaucothi
{{authority control Archaeological sites in Carmarthenshire Gold mines in Wales History of gold mining National Trust properties in Wales Prehistoric sites in Wales Scheduled monuments in Wales Sites of Special Scientific Interest in Carmarthen & Dinefwr Aqueducts in Wales Gold rushes Roman aqueducts outside Rome Underground mines in Wales Mining museums in Wales Tourist attractions in Carmarthenshire Museums in Carmarthenshire Museums of ancient Rome in Wales