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- Great_County_Adit 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 consisted of nearly 40 miles of underground tunnels, providing drainage to over 60 mines.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 United Mines. By 1792 a branch from Poldice extended to Wheal Unity.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 per day into the Carnon River, which 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 the navigation 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.".
- Great_County_Adit thumbnail TruroFalmouthAerial.jpg?width=300.
- Great_County_Adit wikiPageExternalLink adits.htm.
- Great_County_Adit wikiPageExternalLink CISI_St%20Day_report.pdf.
- Great_County_Adit wikiPageID "23185879".
- Great_County_Adit wikiPageRevisionID "461917415".
- Great_County_Adit hasPhotoCollection Great_County_Adit.
- Great_County_Adit subject Category:History_of_Cornwall.
- Great_County_Adit subject Category:History_of_mining.
- Great_County_Adit subject Category:Mining_in_Cornwall.
- Great_County_Adit subject Category:Tin_mining.
- Great_County_Adit point "50.23444444444444 -5.14".
- Great_County_Adit type SpatialThing.
- Great_County_Adit 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 consisted of nearly 40 miles of underground tunnels, providing drainage to over 60 mines.The adit was the brainchild of John Williams (born 1714) of Scorrier who was the manager of Poldice mine.".
- Great_County_Adit label "Great County Adit".
- Great_County_Adit sameAs m.064lh9w.
- Great_County_Adit sameAs Q5599010.
- Great_County_Adit sameAs Q5599010.
- Great_County_Adit lat "50.23444444444444".
- Great_County_Adit long "-5.14".
- Great_County_Adit wasDerivedFrom Great_County_Adit?oldid=461917415.
- Great_County_Adit depiction TruroFalmouthAerial.jpg.
- Great_County_Adit isPrimaryTopicOf Great_County_Adit.
