24' UELISTIAN TIN MINE. 



IV. 



Jn Account of the Relist inn Tin Mine. By Mr. Joseph 

 Carne, in a Letter to Davies Giddy, Esq. M.P. F.R.S*. 



Dear Sir, Penzance, April 22, 1807. 



Chlorite sUist 7 v HEN I mentioned the occurrence of pebbles of chlorite 

 crystallkedtin. ^hist, Cemented by crystallized tin, in the Relislian mine,you 

 expressed a wisUto receive a particul^-r account of this novel 

 circumstance. 

 Theminede- The Relistian mine is nearly on a levol with the surround- 

 scribed. jj^g country. The lode has been seen at the depth of 12, 25, 



50,65,75,81, and 90 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 eourse), its width ^radlially 

 diminishes, till at the distance of 100 fathoms east it is but 5 

 feet wide. It is composed (excepting the metallic substances) 

 ofshist, chlorite, and quartz. In some parts the shist pre- 

 dominates, and in others the chlorite ; the quartz is through- 

 out the smallest component part. The engine shaft (see plan A, 

 PL I, fig. 4) is situate 8 fathoms north of the widest part of the 

 Hode (B). In sinking the shaft a flookan (C), about 2 inches 

 ■wide, was discovered, bearing a south-east course, which cut 

 the lode at an angle of 45°; and heaved and disordered it. 



At the depth of 12, 25, and 50 fathoms, nothing was dis- 

 covered in the lode but the cavities from which the ore had 

 been taken away during the former period of working the 

 mine. 



At 65 fathoms in depth were found, close to the flookan, a 



great number of angular fragments of shist, cemented by the 



same substance. 



jflookan di- At the depth of T5 fathoms the flookan (C) became 4 inches 



diffetnr^^"'^"'^'^^ in the shaft (A), and continued of that si^e for 10 fa- 



l)ranches, thoms; it then became divided into 4 parts or branches (D), 



"With a body of gach diverging from its former course, and in tiiis state it con- 

 pebbles be- ° , 

 twcenthen), tinued through the lode (B), of which the first 3 feet were 



* PhJlos, Trans, for 1807, Part II, p. 298. 



composed 



