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XV. An Account of the Relistian Tin Mine. By Mr. Joseph 
Carne, in a Letter to Davies Giddy, Esq. M.P. F.R.S. 
Read May 7, 1807. 
DEAR Sir, Penzance, April 22, ISO/. 
When I mentioned the occurrence of pebbles of chlorite 
shist, cemented by crystalized tin, in the Relistian mine, you 
expressed a wish to receive a particular account of this novel 
circumstance. 
The Relistian mine is nearly on a level with the surround- 
ing country. The lode has been seen at the depth of 12, 25,50, 
65, 75, 8 1 , and go fathoms from the surface. It is of different 
width in different parts; the extreme width is 36 feet, and in 
this part it is principally worked. As it extends east and west 
(which is its due course), its width gradually diminishes, till 
at the distance of 100 fathoms east it is but 5 feet wide. It is 
composed (excepting the metallic substances) of shist, chlorite, 
and quartz. In some parts the shist predominates, and in others 
the chlorite ; the quartz is throughout the smallest component 
part. The engine shaft (see plan (A)) is situated 8 fathoms 
north of the widest part of the lode (B). In sinking the shaft 
a flookan (C), about 2 inches wide, was dicovered, bearing a 
south-east course, which cut the lode at an angle of 45 0 ; and 
heaved and disordered it. 
Q q 
MDCCCVII. 
