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Vltl. Account of ike Discovery of Silver in Deri and Copper 
Mine. By the Rev. Malachy Hitchins. Communicated by 
the Right Hon. Sir Joseph Banks, Bart. K. B. P. R. S. 
Read February 12, 1801. 
Herland Mine is situated in the parish of Gwinear, about 
seven miles N. E. of St. Michael's Mount, on the southern coast 
of Cornwall ; and two miles and a half from the mouth of the 
river Hayle, on the northern coast of the same county : it is 
contiguous to Prince George Mine. 
It commences in a valley on the west, and passes through a 
hill, which is hrst of steep and then of moderate ascent, for 
upwards of half a mile eastward; when the principal copper 
lodes, which follow this direction, meet with a large cross lode, 
by which, and by other cross courses and fiookans, which inter- 
sect them in their farther progress, they are repeatedly heaved, 
and so disordered by these heaves, in their form and position, 
and so changed by them, in respect to their composition, as 
hardly to be recognized. 
The strata of the district in which this takes place, consist of 
the common metalliferous sort of argillaceous slate called Killas. 
The copper lodes of this district are remarkable for the 
shortness of their continuity ; for, whereas other lodes may be 
traced to an indefinite extent in the same line of direction, these, 
on the contrary, are observed to taper away gradually, and 
