SOUTH OF REDRUTH AND CAMBORNE, ETC. 649 



pyrites, zinc-blende, tin-ore, and occasionally a little wolfram. 

 There are a few irregular strings of quartz running through the 

 mass. Much of the rock is full of little cavities ; and when this 

 honeycombed structure is apparent, the stone is sure to be rich 

 in tin. Between the tin-deposit and the underlying granite there 

 is no regular plane of separation ; on the contrary, there is a gra- 

 dual passage — the rock becomes less cellular, felspar crystals appear 

 spotted with chlorite, and finally you come to clean granite. Occa- 

 sionally there is a little tin-rock above the slide, or the granite may 

 contain iron-pyrites, the crystals of which, both here and in the tin- 

 bearing rock below, are often cubes of | in. to \ in. on the side. 



The mass of stanniferous rock is known to extend for 36 fathoms 

 along the strike ; but it has not been explored further east and west, 

 nor has the depth to which it reaches been ascertained. The lowest 

 workings have been some 30 fathoms from the surface ; 2200 tons 

 of tin-stuff were stamped in 1876, and yielded on an average, I am 

 informed, rather more than 1 per cent, of tin-ore (black tin). 



The Lovell mine, which lies If mile E. by S. from "Wendron 

 church, furnishes an example of a still more curious deposit. At 

 this mine there are two so-called lodes or veins ; the north lode 

 strikes from 37° to 45° N. of E. (true), and dips N.W. at an angle of 

 about 70°; the south lode runs about E. 48° N., and dips "N.W. about 

 60°; the consequence is that the two lodes unite, both going east- 

 ward and in depth. 



Let me now describe the south lode, which is the more important 

 of the two ; and I cannot do better than take the section as I saw it 

 in the 30-fathoms level (fig. 8). 



Fig. 8. — Section at the Lovell Mine, in the 30-fathoms level. 



N.W. S.E. 



... ,BjY 



-■ I ., / /'.'-A. SI A 



Ui,/' HSkft^A a. A 





SFeet 



Scale j^. ^ inch = 1 foot. 

 AA. Granite. BB. "Cab." CO. Lode. 



A A is ordinary granite. B B is the so-called cab, which is com- 

 posed of quartz, mica, gilbertite, chlorite, iron-pyrites, copper-pyrites, 

 and a little schorl. It is usually from 6 to 12 inches thick ; and it is 

 sometimes found on both sides of the lode. C C is the lode itself, a 

 compact dark-coloured mixture of quartz, gilbertite, mica, zinc- 



