Report on the geology of Cornwall, Devon and West Somerset / by Henry T. De La Beche, F.R.S., &c., director of the Ordnance geological survey. Pub. by order of the Lords commissioners of Her Majesty's Treasury.

  • Henry De la Beche
Date:
1839
Catalogue details

Licence: Public Domain Mark

Credit: Report on the geology of Cornwall, Devon and West Somerset / by Henry T. De La Beche, F.R.S., &c., director of the Ordnance geological survey. Pub. by order of the Lords commissioners of Her Majesty's Treasury. Source: Wellcome Collection.

    646/714 (page 608)
    60S in that year. Bv the comparing this with the value Or the oies raised in 1837, we find that the value of the copper produce of Cornwall has increased more than thirteen times and a half dunng the century ending in that year. If we compare the produce of 1787 with that of 1837, we obtain for the half-century an increase in the same value of four times and two-fifths nearly. Though it would appear that copper was raised in Devon early in the last century, it was not until the commencement of the pre- sent century that the copper-mines in that county became impor- tant. The following table will show the ore and metal raised, chiefly from the mines near Tavistock, between 1801 and 1837, Years. 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 Ore. Tons. Cwts. , 1078 18 2204 6 , 2486 0 , 2578 17 . 3832 16 . 4542 13 . 3916 5 . 3308 . 3206 . 3747 . 3540 . 5321 . 5020 . 5743 . 4691 . 3650 14 . 3390 8 . 4053 15 3776 20 3 7 2 0 1 3 3 5 Metal. Tons. Cwts 136 6 ,. 252 12 ,. 288 4 . 283 16 .. 332 0 ,. 412 0 .. 394 15 .. 346 6 .. 364 19 . 358 l .. 323 13 . . 506 15 .. 475 10 ..473 5 .. 371 10 ..319 5 ..287 2 . 407 16 374 16 Years. Ore. Metal. Tons. Tons.Cwts 1820 .... 4037 463 11 1821 • • • • • • • • .... 483 0 1822 .e.. 5064 562 9 1823 .... 5250 .... 557 5 1824 .... 5483 .... 531 11 1825 .... 5732 .... 578 2 1826 5126 496 17 1827 .... 4450 .... 472 16 1828 .... 3911 .... 431 12 1829 . .. 3160 318 0 1830 .... 4034 365 15 1831 .... 3721 311 0 1832 ... 2940 248 0 1833 ... 3403 307 0 1834 .... 4763 395 0 1835 .... 5114 455 0 1836 .... 5759 531 0 1837 .. . 6328 .... 527 0 The produce of the ores will be observed to have varied from about 8-2 to 11-2 per cent., and to have been frequently 9 an per cent. Their value was 12,878/. in 1801 ; 50,714/. in 1806 ; 31 517/. in 1811; 26,270/. in 1816; and, judging from the sales of the Cornish ores, 40,793/. in 1822 ; 34,11 !/■ m 182/ ; 17,132/. in 1832 ; and 44.242Z. in 1837- In 1811 there would appear to have been only seven copper mines yielding ores-viz., Wheal Friendship, 110 tons ; Wheal CreboiL (near Tavistock,) 1308 tons ; Crowndale, 863 tons ; East Crowndale, 913 tons; Ding Dong, 250 tons; Wheal Hope, 6 * This table is compiled from that communicated by Mr. J^n T,sylor to t]; M,„ Brit Devon, p. cctaxii, containing the years from i 801 to 1820 inclusive, and°from information kindly sen, to us by Mr. John Taylor, respecting the produce from ,822 to 1837, inclusive. Toe produce lor 1821 is taken from the Trans. Geol. Soe. Cornwall, vol. u p- 443.