62 ORIGIN AND DEVELOPMENT OF ORE-DEPOSITS. 



1871 East Pool . . (mainly Co ) 3 120 



1872 „ .. .. 1 20 



1873 „ .. ., 6 12 



4 6 152 



Of late years the non-cobaltiferous nickel-ores of New 

 Caledonia have brought down the price of nickel, and still later, 

 the enormous quantities of nickel-matte obtained from the 

 Sudbury ores. 



Uranium, like nickel and cobalt, has been usually found 

 hitherto in veins yielding ores of tin or copper, or in cross- 

 courses near the intersections of such veins. It occurs usually 

 as the proto-peroxide known as pitchblende, in which form con- 

 siderable quantities were formerly raised from St. Ives Consols, 

 and smaller quantities from the St. Just, Camborne, and Illogan 

 Mines. The beautiful phosphate, known as copper-uranite or 

 Torbernite, has also been found in the form of groups of fragile 

 crystals in the shallow parts of almost every copper mine in the 

 county. In one instance a definite N.S. vein of uranium phosr 

 phates has been met with and worked for a considerable 

 distance.* 



The following statistics of uranium production in the west 

 are certainly imperfect, yet they will afford some idea of the 

 rarity of the compounds of this metal from a miner's point of 



view : — 



Quantity. Value. 



Tons cwts. qrs. lbs. ^8 s. d. 



St. Austell Consols 7 

 (1856—1863) 



East Pool 

 (1877—1879) 



Wheal Owles 

 (1878-9) 



South Terras r m r. n n r t. \ 



(1873-89 j 10 (est.) 



1890 

 1891-93) 



* At South Terras, near Grampound Eoad. 



65 

 68 8 

 50 



