255 
ITI.—On the occurrence of Wood-tin ore in the Wheal Metal lode at 
Wheal Vor in Breage—By Mr. WILLIAM ARGALL, Cashier . 
of the Mine.* 
Read at the Spring Meeting, May 16, 1873. 
HE variety of ore which, from its structure, is known as wood- 
tin, has been so very rarely found in lodest that no detail 
respecting it can be devoid of interest. 
The ancient and well-known mine of Wheal Vor—situate on — 
an elevated plain of chloritic slate, immediately east of Tregoning- 
hill, an isolated body of granite—has, perhaps, afforded more tin- 
ore than any other tract, of equal extent, in Cornwall. 
The Wheal Metal lode bears 10°-15° N. of E.—S. of W., and— 
like most of the other lodes in Vheal Vor—dips some 65°-80° N. 
Some six or seven years since, traces of wood-tin were discovered 
about 180 fathoms from the surface west of the Metal shaft ; and, 
within a few months, ore of much the same character. has been 
found at some 200 fathoms deep, 80 fathoms further east in the 
same lode, which maintains for some considerable extent an 
average width of about two feet. Almost suddenly, however, it 
attains a breadth of six feet, and the vein-stone, at the same time, 
becomes less quartzose, more chloritic, and contains a larger pro- 
portion of crystalline tin-ore of the ordinary character. These 
are sometimes separately aggregated, though frequently they are, 
more or less, mixed ; but—whether the ingredients are earthy or 
metallic—the wood-tin occurs either in scattered grains, in small 
isolated masses, or in veins of unequal, yet always of inconsider- 
* Communicated by William Jory Henwood, F.R.S., F.G.S., Member of 
the Institution. 
ft Majendie, Cornwall Geol: Trans: i, p. 238. Carne, Jbid, ix, p. 97. 
Henwood, /bid, v, p. 32. Henty, Proceedings of the Miners’ Association, 
(1867), p. 55. : 
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