Consolidated Mines [Consols or Great Consols], Gwennap

History to 1800

Although there had been mining in the area for over 400 years,^[3]

Consolidated Mines was formed in 1782 by the amalgamation of a number

of neighbouring mines including Wheal Girl, West Wheal Virgin, Wheal

Virgin, Wheal Maid, Wheal Fortune and Carharrack mine.^[2][4]

The underground workings of these mines were interconnected, and before

the merger they had been having significant problems with underground

water. They were jointly running seven Newcomen engines to pump water from their workings into the Great County Adit,^[5]

but the engines had been struggling to keep the water levels down and

they were so expensive to run that all the mines had closed during 1779.^[6]

As part of the merger, five Boulton and Watt engines

were ordered to replace the seven Newcomens. The new engines were

operational by 1782 and saved almost £11,000 a year on coal, though the

mine had to agree to Boulton and Watt's

standard terms which included payment of an annual charge (known as

"dues") of one third of the fuel saved. In fact the mine negotiated with

the company and paid £2,500 each year.^[4][6] In 1784, Boulton and Watt built the first steam whim (winding engine) in Cornwall here,^[7]

and in 1788 they installed an underground pumping engine on the Wheal

Virgin site; this was one of only two underground engines installed in

Cornwall before 1850.^[8]

The end of the 18th century was a difficult time for Cornish

copper mines, because the vast quantity of ore that was being mined

cheaply from Parys Mountain in Anglesey was flooding the market. In 1787 Consols made a loss of some £8,000,^[9]

and some time in the 1780s Boulton and Watt acquired an interest in the

mine, probably in lieu of payment of their dues; furthermore in around

1788 the company reduced the dues to £1,000 a year to help keep the mine

open.^[10] At this time it was one of only two mines in Cornwall to employ over a thousand people, North Downs mine being the other.^[11]

1800 onwards

The

Parys Mountain ore was mined out by about 1800, and the price of copper

soon rose again, reaching a high of £138 per ton in 1805. Many new

mines were started and existing mines restarted at this time.^[12]

Despite this boom, for some unknown reason Consols was substantially

closed in or just before 1811 and it was not until 1819 that mining

entrepreneur John Taylor raised the capital (around £65,000) to restart the mine.^[13]

The mine rapidly became profitable, but its problem with underground

water continued, and in 1820 "Job's Engine", which had a

90-inch-diameter cylinder, was installed for pumping water, followed in

the next year by another engine of the same size. Both were

single-cylinder engines designed by Arthur Woolf and built by the Neath Abbey Ironworks, and they were celebrated as being the largest and most powerful steam engines in the world at the time.^[14] A 58-inch engine was also installed, and by 1829 another three engines had to be added.^[15]

In 1824 Taylor built the Redruth and Chasewater Railway to transport the ore from this mine (and other ones nearby) to the port of Devoran.^[7] By 1839 the mine was employing 3,000 people,^[7]

and the previous year it was recorded that 826 men and boys were

working more than 100 fathoms (180 m) underground, at an average depth

of 229 fathoms (419 m).^[16]

One of the youngest children recorded as working down a Cornish mine

was killed near the 120 fathoms (220 m) level in November 1831. He was

eight years old.^[17]

Some of the lower workings were extremely hot: for instance the air

temperature at the 294 fathom (538 m) level was recorded at 96 °F

(36 °C), increasing to 108 °F (42 °C) in places, and the water that

collected at the bottom of Davey's shaft was 92.5 °F (33.6 °C)—the men

working in the lower levels used this to cool themselves!^[18]

During its relatively short life, Consols was a phenomenally

productive copper mine: between 1819 and 1858 it produced 442,493 tons

of ore, the largest quantity from any single mine in Cornwall,^[19] and the ore it had sold had realised over £2 million.^[20]

Such was its fame that many other mines were opened using the words

"Consolidated" or "Consols" in their names, hoping to profit by

association with the success story.^[21]

By the 1850s it was clear that the copper mines in the west of

Cornwall were becoming exhausted and this together with the start of

foreign production (from Chile, for instance) led to a spate of closures

or further mergers to reduce running costs. Consolidated Mines ceased

working in 1857,^[22] and in 1861 amalgamated with the neighbouring United Mines and Wheal Clifford to form Clifford Amalgamated Mines, which continued, unprofitably, until 1870.^[23]

Today

Today, the site is within area A6i (The Gwennap Mining District) of the Cornwall and West Devon Mining Landscape World Heritage Site.^[24]

Several of the shafts at the mine are still open, but covered with

"Clwyd Caps", which are pyramidal wire meshes. These include Bawden's

shaft, Michell's shaft, and Woolf's shaft which was sunk in 1826 and at

300 fathoms was one of the deepest in the area. There are a few ruined

buildings, a tall chimney and two engine houses in ruins.^[3] A clock tower survives at the former site of Wheal Maid.^[7]

References

Sources