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.

    638/714 (page 600)
    21 cwts. each), estimated to contain 17,433 tons of fine copper, and sold for 1,339,102/. 14«y. The foreign copper-ores are merely introduced for the purpose of smelting, and the purchasers of such ores are bound to export as much copper as is estimated, from assays made previous to sale, to be contained in them ; hence the quantity necessary to be exported depends upon the accuracy of such assays.* The following account of the receipts and expenditure of the Consolidated and United Mines, in Gwennap, adjoining each other and under the same management, for 1836, and for which we are indebted to Mr. John Taylor, will afford an insight into the money-transactions of one of the largest copper-adventures in Cornwall:— Tons. Value. Lords’ Dues. Quantity of ores raised in I the Consolidated Mines. ] [ Copper.. j Tin [Arsenic.. .18,4981 • • • e • • 143 2 ,039 ,533 144 12 0 7 5 10 10 5; ,959 105 6 19 10 0 5 9 4 145 ,717 1 1 6. ,071 10 6 Quantity of ores raised inj ' Copper .. . 2,874 26 ,272 6 10 l A. ,094 13 4 the United Mines. | Tin • • » 106 11 0 4 8 8 26 ,378 17 10 1. ,099 2 0 Amount of Ore-money,deducting Dues. Consolidated Mines ... £139,645 10 7 ,, ,, United Mines 25,279 16 10 rn i i t? £, ,, v (Consols. £102,007 12 Tota. Expense for the Year.|United Mines# # # 35^959 16 £164,925 7 5 JJ 137,968 8 1 Amount of Profit .... £ 26,956 19 f4 511 The following is a statement of the copper, British and Foreign, exported for ten years ending 1837, obtained from one of Sir Charles Lemon’s tables. Journal of the Statistical Society of London, vol. i. p. 83 :— Years. 1827 British Copper. Tons. . 7,171 1828 6,206 1829 • 7,976 1830 c 9,157*7 1831 • 8,530*6 1832 9,730*6 1833 • 7,811*6 1834 e 8,886*5 1835 • 9,111*2 1836 • 8,076*2 1837 • 7,129*3 Foreign Copper. Total. Tons. Tons. 7,171 6,213 8,009*6 9,321*8 8,885*0 10,425*3 9,436*2 10,072*2 11,884*0 10,015*2 12,284*5 and the los$ 33*6 164*1 . 354*4 694*7 1,624*6 1,185*7 2,772*8 1,939*0 5,155*2 f The profit upon the Consolidated Mines being 37,637/. 18$. 6r/., upon the United Mines 10,680/. 19s. 2d.