METALLIFEROUS VEINS. 
607 
Fig. 630. 
of the rent, or Fig. 629. 
partly, perhaps, 
washed in from 
above. This new 
movement has dis¬ 
placed the rock in 
such a manner as 
to interrupt the 
continuity of the 
copper vein {h b), 
and, at the same 
time, to shift or 
heave laterally in 
the same direction 
a portion of the 
tin vein which 
had not previous¬ 
ly been broken. 
Again, in Fig. 
631 we see evi¬ 
dence of a fourth 
fissure (d d), also 
filled with clay, 
which has cut 
through the tin 
vein (a a), and has 
lifted it slightly 
upward towards 
the south. The 
various changes 
here represented 
are not ideal, but 
are exhibited in a 
section obtained 
in working an old 
Cornish mine, long 
since abandoned, 
in the parish of 
Redruth, called 
Huel Peever, and described both by Mr. Williams and Mr. 
Came.* The principal movement here referred to, or that of 
c c, fig. 631, extends through a space of no less than 84 feet; but 
in this, as in the case of the other three, it will be seen that the 
outline of the country above, d^ c, a, etc., or the geographic- 
* Geol. Trans., vol, iv., p. 139; Trans. Roy. Geol. Society, Cornwall, vol. 
ii., p. 90. ' 
Fig. 631. 
Vertical sections of the mine of Huel Peever, Eedruth, 
Cornwall. 
