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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.
47:. 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).
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62:. Although work was started in 1748, it did not reach Poldice mine until the late 1760s. By 1778 the adit had been extended past
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and silt to be washed into the higher part of
Restronguet Creek, permanently damaging navigational access to the upper quays at
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Carrick Roads, showing the silted-up
Restronguet Creek at centre right
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271:. Historic Environment, Cornwall Council. December 2002. p. 13
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The portal of the adit is in the Carnon Valley below the hamlet of
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97:. In 1839, probably at its peak, it discharged over 14.5 million
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that helped drain water from the tin and copper mines in the
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This article about a building or structure in
Cornwall is a
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Series of interconnected drainage adits in
Cornwall, England
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266:"Cornwall Industrial Settlements Initiative - Devoran"
326:"Cornwall Industrial Settlements Initiative - St Day"
308:. Pool, Camborne, Cornwall: Penhellick Publications.
331:. Historic Environment, Cornwall Council. March 2002
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349:. Cornish Mining World Heritage. Archived from
113:pumping into it than were used by the whole of
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78:. By 1792 a branch from Poldice extended to
485:Industrial archaeological sites in Cornwall
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475:History of mining in the United Kingdom
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109:. At that time the adit had more
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203:. Cornish Mining World Heritage
50:The adit was the brainchild of
31:was a system of interconnected
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124:The Carnon River empties into
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418:. You can help Knowledge by
244:"Great County Adit Cornwall"
105:) of water per day into the
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58:who was the manager of
23:, sometimes called the
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306:The Great County Adit
304:Buckley, J A (2000).
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480:Tin mines in England
385:50.23444°N 5.14000°W
128:(a tidal arm of the
465:History of Cornwall
381: /
470:Mining in Cornwall
390:50.23444; -5.14000
353:on 9 December 2008
246:. Cornwall Calling
174:Mining in Cornwall
115:continental Europe
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72:Consolidated Mines
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230:Buckley, pp.47–49
126:Restronguet Creek
21:Great County Adit
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355:. Retrieved
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333:. Retrieved
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273:. Retrieved
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248:. Retrieved
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205:. Retrieved
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107:Carnon River
101:(66 million
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76:United Mines
68:Wheal Peevor
60:Poldice mine
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388: /
95:Twelveheads
80:Wheal Unity
25:County Adit
459:Categories
373:50°14′04″N
207:26 January
180:References
121:combined.
64:Wheal Busy
29:Great Adit
376:5°08′24″W
43:, in the
27:, or the
152:See also
134:Falmouth
56:Scorrier
41:Cornwall
39:area of
357:11 June
335:12 June
297:Sources
275:12 June
250:11 June
142:Devoran
119:America
99:gallons
37:Gwennap
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138:gangue
103:litres
329:(PDF)
269:(PDF)
33:adits
416:stub
359:2009
337:2009
310:ISBN
277:2009
252:2009
209:2015
117:and
74:and
19:The
66:to
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
