201 
Mr. Weaver on the 
traversing the numerous contemporaneous veins of granite and 
quartz, which it encounters in its course. And high up in the 
ravine, to the south of the waterfall, is a small vein about six 
inches wide, which ranges north and south in the granite, and 
consists of quartz bearing copper pyrites of good quality. Both 
these veins, in their progress to the north, come probably in contact 
with Glendalough vein. 
§ 97. Following this stream upward from the waterfall, at the 
distance of about one mile and a half from Lough Finogefin, we 
meet with a vein on the western side of the stream, composed prin- 
cipally of quartz with some lamellar heavy-spar and iron pyrites; 
but so little is exposed that its relations are uncertain. 
§ 98. The direction of the lead vein at Ballinafinchogue in 
Glenmalur (§. 33.), forms an acute angle with the course of the valley, 
ascending in its progress to the south-east the northern brow of the 
glen. It has been traced for a distance of about four hundred 
fathoms, but probably extends farther. As far as known, however, 
it is confined to the alternating beds of granite and mica slate. It is 
inclined for more than forty fathoms from the surface to the south- 
ward, under an angle of 80°; but for the remaining depth to the 
adit level the dip is northward at the same angle; so that it may be 
considered upon the whole as vertical. The width varies from two to 
three fathoms, and the mass is composed of quartz, attended more or 
less with loose vein soil on either side, and with a thin coat of clay 
or sticking next the walls. The ore has been principally obtained 
on the south side of the vein, but it occurs also on the north side, 
and even in the central part; so that three deposits of galena have 
appeared within it, which, when they coalesce, have formed con- 
siderable bodies of ore. White lead ore, both massive and crystal- 
lized, also occasionally appears, with blende, copper pyrites, iron 
