Poldice mine

A legal document of 1512 about a theft of tin "near Poldyth in Wennap" indicates that mining was probably taking place around Poldice at that time, but this mine is certainly known to have been in operation by the 17th century.{{cite web

|url=http://www.cornwallinfocus.co.uk/history/poldice.php

|title=The Mines of Gwennap - Poldice Mine

|publisher=Cornwall in Focus

|access-date=2009-07-29

|archive-url=https://web.archive.org/web/20100128100146/http://www.cornwallinfocus.co.uk/history/poldice.php

|archive-date=2010-01-28

|url-status=dead

}} At the end of the 17th and beginning of the 18th century, 800 to 1,000 men were employed.{{cite news |title=Occasional Notes |work=The Cornishman |issue=491 |date=1 December 1887 |page=4}}

In 1748, Poldice's chief adventurer William Lemon and manager John Williams started the Great County Adit in the Carnon Valley. It formed a cheap and effective method of draining many of the mines in the locality and also provided a means of locating new lodes of ore.{{cite book

|last=Hancock

|first=Peter

|title=The Mining Heritage of Cornwall and West Devon

|publisher=Halsgrove

|location=Wellington, Somerset

|year=2008

|pages=64–65

|isbn=978-1-84114-753-6}} When the adit reached Poldice in the late 1760s,{{cite web |url=http://www.cornwall-calling.co.uk/mines/great-adit.htm |title=Great County Adit Cornwall |publisher=Cornwall Calling |access-date=2009-07-29}} the mine was using two Newcomen steam engines, with cylinders of diameter 66 inches and 60 inches to drain the mine into the adit.

As the mine was some distance from the sea, transport to market was a problem for the mining operation. A pioneering railway, the Portreath Tramroad was opened in 1812 giving access to Portreath harbour.

In November 1821 a 90-inch Woolf single-cylinder pumping engine was installed at the mine, the third one of this size in the county, after two had been installed at Consolidated Mines in February of the same year. These were by far the largest steam engines in Cornwall at the time.Barton 1966, p. 41 In 1842 this engine was raising an average of 887 gallons per minute and it was one of the most heavily worked engines in the county.Barton 1966, p. 102 It was re-cylindered as an 85 inch in 1845 and was still working well when it was sold for £700 in August 1867 to Great Western Deep Coal Co. in the Forest of Dean.

By the 1860s the copper industry was in decline, and some time between 1869 and 1872 the mine sold £12,000 worth of redundant equipment to J. C. Lanyon & Son of Redruth, a major dealer and exporter of mine equipment.Barton 1966, pp. 65–66 Despite these sales, the mine purchased from Perran Foundry a new 85-inch pumping engine that cost £2,250 and which was in operation by early 1873. At the time it was needed to deal with the water flooding into the mine as a result of a very wet winter, but in July 1873 after working for just 6 months, the engine was up for sale and the mine had closed because it was unable to cope with the cost of pumping water out of the workings. The engine was sold to a company in Scotland.Barton 1966, p. 71

The mine was extracting tin ore in 1748, but by 1788 the output of copper ore exceeded that of tin, and by the 1790s it was making a good profit. In the early 19th century the mine merged with neighbour Wheal Unity. The mine switched to arsenic extraction, although metals were still being mined in decreasing quantities, but by the 1910s most of the activity was over and although small-scale mining continued into the 1920s, it closed in 1930.{{cite web

|url=http://www.trevithick-society.org.uk/industry/poldicearsenic.htm

|title=Poldice Mine (arsenic works)

|publisher=The Trevithick Society

|access-date=2009-07-30

|archive-url=https://web.archive.org/web/20090809112043/http://www.trevithick-society.org.uk/industry/poldicearsenic.htm

|archive-date=2009-08-09

|url-status=dead

}}

Apart from the enormous quantities of the common ores mined at Poldice, the area was also known for rarer and more valuable minerals including chalcophyllite, olivenite, mimetite and liroconite.{{citation needed|date=July 2020}}

Today, the ruins of many mine buildings and mineshafts are visible in the Poldice Valley, which has not seen any further development since the end of mining. The valley is now a nature reserve,{{citation needed|date=July 2020}} and is a popular location for mountain bicycling.{{fact|date=May 2025}}

From Robert Hunt's Mineral Statistics of the United Kingdom{{Cite book |last1=Burt |first1=Roger |url=https://books.google.com/books?id=vZEpmwEACAAJ |title=Mining in Cornwall and Devon: Mines and Men |last2=Burnley |first2=Ray |last3=Gill |first3=Michael |last4=Neill |first4=Alasdair |date=2014 |publisher=University of Exeter Press |isbn=978-0-85989-889-8 |language=en}}.

{{Portal|Cornwall}}

• Consolidated Mines
• Devon Great Consols
• Wheal Vor
• Wheal Jane
• Mining in Cornwall and Devon
• Portreath Tramroad

{{Reflist}}

• Poldice Valley, Bob Acton, Landfall Publications, 1990.

{{refbegin}}

• {{cite book

| last=Barton

| first=D. B.

| title=The Cornish Beam Engine

| publisher=D. Bradford Barton Ltd

| year=1966

| location=Truro

| edition=New

}}

{{refend}}

{{Cornwall|state=collapsed}}

Category:Arsenic mines in Cornwall

Category:Copper mines in Cornwall

Category:Tin mines in Cornwall

Category:Industrial archaeological sites in Cornwall