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.

    644/714 (page 606)
    most valuable in Cornwall; the average of its profits for the last five or six years has been estimated at from 40.000/. to 50,000/. per annum.* The following is an account, by Pryce, of the copper ores sold in Cornwall from 1726 to 1775, inclusive :—j Ten Years’ Average Price Tonnage. per Ton. £, s• d. Amount. £. Average Annual Tonnage. Average Annual Amount. £. 17261 1735J j- 64,800 . . 7 15 10 . . 473,500 . . 6,480 . . 47,350 1736] 1745 J [ 75,520 . . 7 8 6 . . 560,106 . . 7,552 . . 56,010 17461 1755J . 98,790 . . 7 8 0 . . 731,457 . . 9,879 . . 73,145 17561 1765 J j. 169,699 * . 7 6 6 . . 1,243,045 . . 16,970 . . 124,304 17661 1775 j j. 264,273 . . 6 14 6 . 1,778,337 . . 26,427 . . 177,833 The subjoined Table shows the copper ores raised in Cornwall, with their value, from 1771 to 1838, inclusive — Years. Tons of Ore. Tons of Copper. £. Standard. Years. Tons of Ore. Tons of Copper. <£. Standard. ^fc*. s. s. 1771 27,896 3,347 189,609 81 0 1805 78,452 6,234 862,410 169 16 1772 27,965 3,356 189,505 81 0 1806 79,269 6,863 730,845 138 & 1773 27,663 3,320 148,431 70 0 1807 71,694 6,716 609,002 120 0 1774 30,254 3,630 162,000 68 0 1808 67,867 6,795 495,303 100 / 1775 29,966 3,596 192,000 78 0 1809 76,245 6,821 770,028 143 12 1776 29,433 3,532 191,590 79 0 1810 66,048 5,682 569,981 132 5 1777 28,216 3,386 177,000 77 0 1811 66,499 5,948 563,742 126 0 1778 24,706 2,965 140,536 72 0 1812 75,510 7,248 608,065 113 0 1779 31,115 3,734 180,906 73 0 1813 86,713 8,166 685,572 113 0 1780 24,433 2,932 171,231 83 0 1814 87,482 7,936 766,825 128 0 1781 28,749 3,450 178,789 77 0 1815 79,984 6,607 582,108 121 0 178'2 28,122 3,375 152,434 70 0 1816 83,058 7,045 541,737 109 0 1783 35,799 4,296 219,937 76 0 1817 75,816 6,608 422,426 96 0 1784 36,601 4,392 209,132 72 0 1818 80,525 6,714 587,977 121 0 1785 36,959 4,434 205,451 71 0 1819 93,234 7,214 728,032 136 0 1786 39,895 4,787 237,237 75 0 1820 92,672 7,364 620,347 119 0 1787 38,047 190,738 1821 98,803 8,163 628,832 111 0 1788 31,541 • • 150,303 1822 106,723 9,331 676,285 104 0 1789 33,281 184,382 1823 97,470 8,070 618,933 110 0 1790 • • . # • • 1824 102,200 8,022 603,878 110 0 1791 • « , • • • 1825 110,000 8,417 743,253 124 0 1792 • . . . • • 1826 118,768 9,140 798,790 123 0 1793 . • 0 • • • 1827 128,459 10,450 755,358 106 0 1791 42,816 • • 320,875 1828 130,866 9,961 759,175 112 7 1795 43,589 • > 336,189 1829 125,902 9,763 725,834 109 14 1796 43,313 4,950 356,564 1830 135,665 10,890 784,000 106 15 1797 47,909 5,210 377,838 1831 146,502 12,218 817,740 99 18 1798 51,358 5,600 422,633 1832 139,057 12,099 835,812 104 14 1799 51,273 4,923 469,664 121 0 1833 138,300 11,185 858,708 no 0 1800 55,981 5,187 550,925 133 3 1834 143,296 11,224 887,902 114 4 1801 56,611 5,267 476,313 117 5 1835 153,607 12,271 896,401 106 11 1802 53,937 5,228 445,094 110 18 1836 140,981 11,639 957,752 115 12 1803 60,566 5,616 533,910 12 2 0 1837 140,753 10,823 908,613 119 5 1804 64,637 5,374 570,840 136 5 K970TWKP39K£CJ!tt^t 1838 -..■asBsanaBGu; 145,688 11,527 857,779 109 3 * This is a very dry mine, requiring comparatively little machinery to raise the water from it; and it is also well situated on the slope ot' a hill. Mineralogia Cornubiensis, Introduction, p. xv. + It is compiled up to 1832, from the Account of the Annual Produce of the