OS.tGtN AND DEVELOPMENT OE ORE-DEPOSITS. 



51 



Cobalt had also been found at Dudmans mine in lUogan ; in a 

 mine near Ponsanooth, and in Dolcoath.* In 1818, Kupfer- 

 nickel was raised at Pengelly mine in St. Ewe, according to 

 Mr. G-regor, but nothing is said as to the quantity. 



Sir Henry de la Beche, writing in 1837, says that Cobalt 

 had been found in a cross-course adjoining a copper-lode at 

 Wheal Sparnon near Eedruth, and again at Dolcoath ; also at 

 Botallack, Herland, Polgooth, and Wheal Unity. At this latter 

 mine 1,700 lbs. of an inferior quality was sold in 1820. Cobalt 

 had also been found at Wheal Huck worthy near Sampford Spiney. 

 The ores were mostly tin-white cobalt (Smaltite) and Cobalt 

 bloom (Erythrite)t 



In the period from 1854 to 1861 the largest producer of 

 nickel and cobalt was St. Austell Consols, | as may be seen by the 

 following figures which are taken from Mr. Williams's statement, 

 and supplemented by the Mineral Statistics for the period. 



Value. 



Total for 7 years .. .. 133 16 3 15 7396 13 4 



Small quantities of these ores have since then been raised 

 from other mines, as is shown by the following returns from the 

 same official source : — 



1858 

 1860 

 1867 



Fowey Consols (Ni. & Co.) 



5 3 244 14 11 



* Pryce, Min. Corn., p. 50. 

 t Report, &c., pp. 614-5. 



J For a description of the mode of occurrence of the nickel and cobalt-ores, 

 see a paper by the manager, Mr. E. H. Williams, Rep. Roy. Inst. Corn., 1857. 



