| 词条 | Wheal Gorland |
| 释义 |
| name = Wheal Gorland | image = Liroconite-76634.jpg | width = | caption = Liroconite from Wheal Gorland, its type locality | pushpin_map = Cornwall | pushpin_label = Wheal Gorland | pushpin_map_caption = Location in Cornwall | coordinates = {{coord|50.2417|N|5.1839|W|format=dms|display=inline,title}} | place = St Day | subdivision_type = County | state/province = Cornwall | country = England | owner = | official website = | acquisition year = | stock_exchange = | stock_code = | products = Copper, tin, arsenic and tungsten | financial year = | amount = | opening year = 1792, 1906 | closing year = 1864, 1909 }}Wheal Gorland was a metalliferous mine located just to the north-east of the village of St Day, Cornwall, in England, United Kingdom. It was one of the most important Cornish mines of the late 18th and early 19th centuries, not only for the quantity of ore it produced, but also for the wide variety of uncommon secondary copper minerals found there[1] as a result of supergene enrichment.[1] It is the type locality for the minerals Chenevixite, Clinoclase, Cornwallite and Liroconite.[2] HistoryThe production of the mine was very inconsistent because of the sporadic distribution of its rich ore-bodies: in 1833 George Abbot wrote[3] that it had made profits of over £300,000, produced 1,400 tons of ore per annum, and ranked third, in terms of profits,[4] just behind Dolcoath mine and Consolidated Mines. However, in 1865 Thomas Spargo wrote[5] "now part of St. Day United; idle".[6] In the early 1790s Wheal Gorland was connected to the Great County Adit and its own existing shallow adits were adapted to drain into this deeper adit.[7] Records show that between 1815 and 1851 the mine produced 40,750 tons of 7½% copper ore, 15 tons of black tin, and 18 tons of arsenic.[9] Much fluorspar was also produced, and gold was reputedly found in the gossan.[9] In 1852 the mine was taken over by the St. Day United Group of mines and it became the main site for maintenance of the Great County Adit,[7] but by 1864 it had been abandoned.[6] The mine was reopened in 1906 when Edgar Allen and Company[7] reworked the stopes and the dumps for tin and tungsten ores. It sold 164 tons of tungsten ore and 18 tons of black tin before closing, for the last time, in 1909.[8] Since 1988 the site has been designated as a Site of Special Scientific Interest because of the variety and quality of lead and copper minerals that have been found in the mine dumps.[9] A condition summary compiled on 21 July 2010 reported that the site was in an ″unfavourable declining condition″ because an earth science feature was obstructed and another removed. The summary further states that the vegetation on the remaining mine dump may also be affecting the mineral features of the site as new soil horizons could affect chemical processes within the dump.[10] See also
References{{Commons category|Minerals of Wheal Gorland}}1. ^{{cite web|url=http://projects.exeter.ac.uk/geomincentre/excur-gwennap.htm|title=Camborne School of Mines Virtual Museum - The Cornubian Orefield|publisher=University of Exeter|accessdate=2009-06-20}} {{SSSIs Cornwall geological|state=collapsed}}2. ^{{cite web|url=http://www.mindat.org/loc-939.html|title=Wheal Gorland, St Day United Mines (Poldice Mines), Gwennap area, Camborne - Redruth - St Day District, Cornwall, England, UK|publisher=mindat.org|accessdate=2009-06-20}} 3. ^in: An Essay on the Mines of England: Their Importance as a Source of National Wealth 4. ^in a table entitled: Mines which have been continuously productive, and are still working profitably 5. ^on page 54 of: [https://books.google.com/books?id=eOgGAAAAQAAJ&ots=UOi2O1se58&pg=PR1 The Mines of Cornwall and Devon: Statistics and Observations] (online at Google Books) 6. ^1 {{cite web|url=http://www.cornwallinfocus.co.uk/history/gorland.php|title=The Mines of Gwennap - Wheal Gorland|publisher=Cornwall in Focus|accessdate=2009-06-20}} 7. ^1 2 3 {{cite book | last = Buckley | first = J A | title = The Great County Adit | publisher = Penhellick Publications | location = Pool, Camborne, Cornwall | year = 2000 | pages=55–56 | isbn = 1-871678-51-X}} 8. ^1 2 {{cite book | last = Dines | first = H. G. | title = The Metalliferous Mining Region of South-West England. Volume I | publisher = HMSO | year = 1956 | location = London | page = 408}} 9. ^{{cite web|title=Wheal Gorland|url=http://www.sssi.naturalengland.org.uk/citation/citation_photo/1003565.pdf|publisher=Natural England|date=24 June 1988|accessdate=29 October 2011}} 10. ^{{cite web|title=SSSI unit information|url=http://www.sssi.naturalengland.org.uk/special/sssi/unit_details.cfm?situnt_id=1003853|publisher=Natural England|accessdate=29 October 2011}} 5 : Tin mines in Cornwall|Copper mines in Cornwall|Sites of Special Scientific Interest in Cornwall|Sites of Special Scientific Interest notified in 1988|Industrial archaeological sites in Cornwall |
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