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| History | |
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The method is well described by Pliny the Elder in Book XXXIII of his Naturalis Historia from the 1st century AD. He distinguishes the use of the method for prospecting for ore and use during mining itself. It was used during the Roman period for hydraulic mining of alluvial gold deposits, and in opencast vein mining, for removal of rock debris, created by mechanical attack and fire-setting. He describes how tanks and reservoirs are built near the suspected veins, filled with water from an aqueduct, and the water suddenly released from a sluice-gate onto the hillside below, scouring the soil away to reveal the bedrock and any veins occurring there.
[edit] Tags:Mining,Water,Hydraulic Mining,Gold,Tin,Pliny The Elder,Naturalis Historia,Opencast,Fire-setting,Alluvial,Aqueduct, | |
| Method | |
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The power behind a large release of water is very great, especially if it forms a single water wave, and is well known as a strong force in coastal erosion and river erosion. Such a wave could be created by a sluice gate covering one end of the reservoir, possibly a permanent fixture such as a swinging flap or a rising gate. The size of the tank controlled the height of the wave and its volume. Hushing was most effective when used on steep ground such as the brow of a hill or mountain, the force of falling water lessening as the slope becomes smaller. The rate of attack would be controlled by the water supply, and perhaps more difficult the higher the deposit to be cleared.
If veins of ore were found using the method, then hushing could also remove the rock debris created when attacking the veins. Pliny also describes the way hillsides could be undermined, and then collapsed to release the ore-bearing material. The Romans developed the method into a sophisticated way of extracting large alluvial gold deposits such as those at Las Medulas in northern Spain, and for hard rock gold veins such as those at Dolaucothi in Wales. The development of the mine at Dolaucothi shows the versatility of the method in finding and then exploiting ore deposits.
Small tank A near north opencast at Dolaucothi: the person is standing within the reservoir bank, which has eroded over the years
Tank C above main opencast at Dolaucothi
There are the remains of numerous tanks and reservoirs still to be seen at the site, one example being shown at left. It was a small tank built for prospection on the north side of the isolated opencast north of the main mine. It was presumably built to prospect the ground to one side of the opencast for traces of the gold-bearing veins extending to the north. It failed to find the veins here, so was abandoned. It probably precedes the construction of the 7 mile long aqueduct supplying the main site, and was fed by a small leat from a tributary of the river Cothi about a mile further north up the valley. The method could be applied to any ore type, and succeeded best in hilly terrain. The Romans were well experienced in building the long aqueducts needed to supply the large volumes of water needed by the method, and was probably directed by army engineers.
[edit] Tags:Water Wave,Coastal Erosion,River Erosion,Las Medulas,Spain,Dolaucothi,Wales,Leat,Romans,Aqueducts, | |
| Earlier evidence | |
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The earlier history of the method is obscure, although there is an intriguing reference by Strabo writing ca 25 BC in his Geographica, Book IV, Chapter 6, to gold extraction in the Val d'Aosta in the Alps. He describes the problem gold miners had with a local tribe because of the great volumes of water they had taken from the local river, reducing it to a trickle and so affecting the local farmers. Whether or not they used the water for hushing remains unknown, but it seems possible because the method requires large volumes of water to be operated. Later, when the Romans assumed control of the mining operations, the locals charged them for using the water. The tribe occupied the higher mountains and controlled the water sources, and had not yet been subdued by the Romans:
The country of the Salassi has gold mines also, which in former times, when the Salassi were powerful, they kept possession of, just as they were also masters of the passes. The Durias River was of the greatest aid to them in their mining — I mean in washing the gold; and therefore, in making the water branch off to numerous places, they used to empty the common bed completely. But although this was helpful to the Salassi in their hunt for the gold, it distressed the people who farmed the plains below them, because their country was deprived of irrigation; for, since its bed was on favourable ground higher up, the river could give the country water. And for this reason both tribes were continually at war with each other. But after the Romans got the mastery, the Salassi were thrown out of their gold-works and country too; however, since they still held possession of the mountains, they sold water to the publicans who had contracted to work the gold mines; but on account of the greediness of the publicans. Salassi were always in disagreement with them too.
The historian Polybius, who lived from 220 to 170 BC was writing much earlier in The Histories (Book 34), and he records that gold mining in the Alpine region was so successful that the price of gold in Italy fell by a third during this period. From his description of large nuggets, and the find being made only two feet below the ground level, with deposits reaching down to 15 feet, it is likely to have been an alluvial deposit where water methods such as hushing would have been very effective. Modern attempts to identify the mines point to one especially large ancient gold mine at Bessa in Northern Italy. It appears to have been worked intensively in pre-Roman days and continued to expand with Roman involvement. The scale of the aqueducts there seems to support Strabo's comments.
[edit] Tags:Strabo,Geographica,Val D'aosta,Polybius,Gold Mining,Alpine,Italy, | |
| Later examples | |
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The technique appears to have been neglected through the medieval period, because Georg Agricola, writing in the 15th century in his De Re Metallica, does not mention hushing at all. On the other hand, he does describe the many uses of water power, especially for washing ore and driving watermills.
However, the technique was used on a large scale in the lead mines of northern Britain from at least Elizabethan times onwards. The method is described in the Royal Commission on Children in Mines in 1842 in relation to children being used in the lead mines of the Pennines. The method was described in some detail by Westgarth Forster in his book A Treatise on a Section of the Strata from Newcastle-upon-Tyne to the Mountain of Cross Fell in Cumberland. The first edition was published in (1809), but the third edition published in 1883 is more widely available. The remnants of the "hush gullies" are visible at many places in the Pennines as well as at many other locations such as the extensive lead mines at Cwmystwyth in Ceredigion, and at the Stiperstones in Shropshire. The dams used to store the water before use are also often visible at the head of the stream. One famous and spectacular example is the Great Dun Fell hush gully near Cross Fell, Cumbria, probably formed in Georgian era in the search for lead and silver. The gully is about 100 feet deep, carries a small stream, and is a prominent landmark on the bleak moors. Although the Cornish did not use the term "hushing", there is at least one reference to the technique being used at Tregardock in North Cornwall. Around 1580 mine adventurers used the method to work a lead-silver deposit, although lives were lost in the attempt.[3]
In south eastern Lancashire hushing was used to extract limestone from the glacial boulder clay so that it could be used to make lime for agriculture, mortar, plaster and limewash. Bennett (Bennett W 1948 A History of Burnley Vol.2 p. 97) notes leases of land for this purpose in the 17th and 18th centuries and remains can still be seen at sites like Shedden Clough. Hushing for limestone seems to have been limited to the eastern side of the Pennine ridge, between Burnley and the Cliviger Gorge, and probably occurred here because of the cost of obtaining supplies from further away, as well as the suitability of the boulder clay and the availability of water supplies.
The technique was also used during alluvial gold mining in Africa, at least until the 1930s, when it was described by Griffith in his book Alluvial Mining (2nd Ed, 1960). The water outlet could be controlled by an automatic system which allowed water to flow through the sluice gate when the overflow triggered a release mechanism.
[edit] Tags:Georg Agricola,Watermills,Lead,Royal Commission,Pennines,Westgarth Forster,Cwmystwyth,Ceredigion,Stiperstones,Shropshire,Great Dun Fell, | |
| See also | |
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Dartmoor tin-mining
Derbyshire lead mining history
Dolaucothi
Hydraulic mining
Las Medulas
Mining in Cornwall
Placer mining
Polybius
Roman engineering
Roman technology
Roman mining
Strabo
Westgarth Forster
[edit] Tags: | |
| Notes | |
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^ "Methods used". Lead Mining. Durham Miner Project. http://www.durham-miner.org.uk/miner/projects.nsf/581cd74a9c6aa8b080256d48003758cb/6c0a47fe223b390880256e82004577a2?OpenDocument. Retrieved 2008-04-24.
^ "Glossary". http://www.keystothepast.info/durhamcc/k2p.nsf/k2pGlossaryList?readform&letter=H. Retrieved 2008-04-24.
^ "Archaeology Alive, volume 11.". The Historic Environment Service, Cornwall County Council. pp. 37. http://212.104.147.54/media/pdf/h/0/aa11_1.pdf. Retrieved 2008-04-24.
[edit] Tags: | |
| References | |
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Oliver Davies, 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.
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).
Hodge, A.T. (2001). Roman Aqueducts & Water Supply, 2nd ed. London: Duckworth.
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.
[edit] Tags: | |
| External links | |
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Royal Commission on Children in Mines describes hushing in 1842
Roman technology
Hushing in Yorkshire mines
Great Dun Fell hush gulley
Hushing in Gunnerdale, Yorkshire
Roman gold mine with numerous aqueducts
Hushing as used at Cwmystwyth mine
Remains of hushing systems in Wales by Timberlake
Shedings at Shedden Clough
Shedden Clough Hushings
Retrieved from "http://en.wikipedia.org/w/index.php?title=Hushing&oldid=459358408"
Categories: Mining techniquesHistory of miningRoman aqueductsAqueducts in the United KingdomHydraulic engineeringHidden categories: Articles lacking in-text citations from March 2011All articles lacking in-text citations
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