of Silver in Herland Copper Mine. 16* 
About one hundred and eight tons of this ore have been 
raised. The miners continue to sink near the same point of 
intersection ; and seem confident that both lodes will soon be- 
come richer, because similar instances of declension and reco- 
very have frequently occurred in the copper lodes of this mine, 
and because the two lodes appear to have a reciprocal influence 
on each other. 
Unfortunately, however, the extent of their speculation is 
limited by the great depth of the present workings ; for, forty- 
five fathoms have been sunk since the first discovery of the sil- 
ver ; and twenty, or twenty-five fathoms more, are as much as 
can be sunk in this mine, with its present mechanical powers 
of drawing the water; at which level, viz. one hundred and eighty 
fathoms from the surface, it would be somewhat deeper than 
any mine in Cornwall, and about one hundred and thirty fathoms 
below the level of the sea, at low water mark. 
The other cross lodes in this mine produce no silver ; most 
of them being flookans, or lodes which are essentially different 
from the argentiferous cross lode, in the nature of their consti- 
tuent mass. There is one, however, in the eastern part of the 
mine, which, from its resemblance to that, is thought likely to 
produce silver, whenever it shall be explored to the same depth, 
at its point of intersection ; although these hopes may probably 
be fallacious, for the argentiferous lode intersects five other cop- 
per lodes, viz. two on the north, and three on the south side, 
without producing any silver. 
