|
|
Page 154:-
[stratifica]tion follows the slaty cleavage, then it may be said
to have its bearing tending towards the north-east and
south-west; dipping generally at a high angle to the south-east,
and presenting the edges of its laminae to the surface of the
granite, from the proximity of which the nature and appearance of
the rock must be presumed to be altered.
The rocks belonging to this division do not effervesce with
acids; they contain no calcareous spar, except a little in some
of the veins. They are sometimes intersected by dykes of a harder
kind of rock, apparently of the nature of trap or greenstone.
Veins of lead ore occur in several places; and have been worked
between Skiddaw and Saddleback, in Thornthwaite, Newlands, and
Buttermere; but one in the parish of Loweswater, and one below
the level of Derwent Lake, are the most productive at present in
this district. A copper mine had formerly been worked to a great
depth in a hill called Gold Scalp, in Newlands, and is said to
have produced a very rich ore, which appears to have been a
yellow sulphuret or copper pyrites. A little cobalt ore has been
got in Newlands, and small quantities of manganese in various
places. A salt spring near the Grange in Borrowdale, has
anciently been in some repute for its medicinal qualities;
another has been more recently discovered in working a lead mine
near Derwent Lake. They both issue from veins in this rock, but
their source remains unknown.
|
