About: Great County Adit

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The Great County Adit, sometimes called the County Adit, or the Great Adit was a system of interconnected adits that helped drain water from the tin and copper mines in the Gwennap area of Cornwall, in the United Kingdom. Construction started in 1748 and it eventually reached a length of over 40 miles (64 km) of a tunnel, providing drainage to over 100 mines at an average depth of 80–100 metres (260–330 ft).

Attributes	Values
rdf:type	geo:SpatialThing
rdfs:label	Great County Adit (en)
rdfs:comment	The Great County Adit, sometimes called the County Adit, or the Great Adit was a system of interconnected adits that helped drain water from the tin and copper mines in the Gwennap area of Cornwall, in the United Kingdom. Construction started in 1748 and it eventually reached a length of over 40 miles (64 km) of a tunnel, providing drainage to over 100 mines at an average depth of 80–100 metres (260–330 ft). (en)
geo:lat	50.234444 (xsd:float)
geo:long	-5.140000 (xsd:float)
foaf:depiction
dcterms:subject	History of mining in the United Kingdom History of Cornwall Mining in Cornwall Tin mines in England Industrial archaeological sites in Cornwall
Wikipage page ID	23185879 (xsd:integer)
Wikipage revision ID	1083725854 (xsd:integer)
Link from a Wikipage to another Wikipage	Carnon River History of mining in the United Kingdom Litre United Kingdom Devoran History of Cornwall Consolidated Mines Cornwall Gallon Continental Europe Steam (software) Mining in Cornwall Adit Twelveheads Tin mines in England Wheal Busy Wheal Peevor Gangue Americas Falmouth, Cornwall Industrial archaeological sites in Cornwall Restronguet Creek Gwennap Poldice mine Carrick Roads Scorrier Williams family of Caerhays and Burncoose Mining in Cornwall dbr:United_Mines dbr:Wheal_Unity
Link from a Wikipage to an external page	https://web.archive.org/web/20081209080228/http:/www.cornish-mining.org.uk/story/adits.htm http://www.historic-cornwall.org.uk/cisi/st_day/CISI_St%20Day_report.pdf http://www.cornish-mining.org.uk/story/adits.htm
sameAs	Great County Adit Great County Adit Great County Adit Great County Adit Great County Adit
dbp:wikiPageUsesTemplate	dbt:Cite_book dbt:Cite_web dbt:Convert dbt:Coord dbt:Portal dbt:Refbegin dbt:Refend dbt:Reflist dbt:Short_description dbt:Use_dmy_dates dbt:Cornwall-struct-stub
thumbnail	wiki-commons:Special:FilePath/TruroFalmouthAerial.jpg?width=300
georss:point	50.23444444444444 -5.14
has abstract	The Great County Adit, sometimes called the County Adit, or the Great Adit was a system of interconnected adits that helped drain water from the tin and copper mines in the Gwennap area of Cornwall, in the United Kingdom. Construction started in 1748 and it eventually reached a length of over 40 miles (64 km) of a tunnel, providing drainage to over 100 mines at an average depth of 80–100 metres (260–330 ft). The adit was the brainchild of John Williams (born 1714) of Scorrier who was the manager of Poldice mine. Although work was started in 1748, it did not reach Poldice mine until the late 1760s. By 1778 the adit had been extended past Wheal Busy to Wheal Peevor, and another branch, known as the Consols Adit was driven west in the 1770s and 80s to drain the Consolidated Mines and . By 1792 a branch from Poldice extended to . The portal of the adit is in the Carnon Valley below the hamlet of Twelveheads. In 1839, probably at its peak, it discharged over 14.5 million gallons (66 million litres) of water per day into the Carnon River. At that time the adit had more steam engines pumping into it than were used by the whole of continental Europe and America combined. The Carnon River empties into Restronguet Creek (a tidal arm of the Carrick Roads upstream from Falmouth). Major floods in the winter of 1876 caused large quantities of gangue and silt to be washed into the higher part of Restronguet Creek, permanently damaging navigational access to the upper quays at Devoran. Although all the mines served by the Great County Adit have closed and it is unmaintained, it still drains many of their underground workings today; in the summer of 1980 the flow was 500,000 gallons per day. (en)
gold:hypernym	System
prov:wasDerivedFrom	wikipedia-en:Great_County_Adit?oldid=1083725854&ns=0
page length (characters) of wiki page	4160 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Great_County_Adit
geo:geometry	POINT(-5.1399998664856 50.234443664551)
is Link from a Wikipage to another Wikipage of	Scorrier House Consolidated Mines Adit Twelveheads Wheal Busy Wheal Gorland Wheal Peevor County Adit Great Adit Gwennap Killifreth Mine Poldice mine Redruth and Chasewater Railway Williams family of Caerhays, Burncoose and Scorrier
is Wikipage redirect of	County Adit Great Adit
is foaf:primaryTopic of	wikipedia-en:Great_County_Adit

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