243 
Geological Relations of the East of Ireland . 
It is remarkable that in the clay slate tract immediately to the 
south of this line of softness , are several metalliferous veins, which 
do not appear ever to have undergone adequate trial. In Knock- 
enroe especially, is a powerful vein, consisting at the surface prin- 
cipally of quartz and iron pyrites, with some heavy spar, galena, 
and blende. This vein ranges 15° north of east and south of west, 
and it may be traced a considerable distance through Ballino into 
Knockeen, ascending the northern brow of the hill, but disappear- 
ing below the sandstone, which covers the clay slate in the western 
quarter. In the latter part of its course, it exhibits also copper 
pyrites. And in Knockeen higher up, above the junction of the 
sandstone and clay slate, three other veins appear, ranging in the 
clay slate nearly parallel to each other, but of less dimensions than 
the one last mentioned , being only from two to three feet wide. 
These veins consist also of quartz, heavy spar, galena, blende, and 
pyrites, 
§. 141. Lackamore copper mine is situated about five miles to 
the east of Newport, in clay slate, but so low in the valley that 
an adit level of twelve fathoms in depth is all that could be ob- 
tained. Here are two veins composed of brown spar, calcareous 
spar, clay, and iron ochre more or less indurated, a few inches in 
width ; and a third vein composed of the same materials, but of 
greater thickness, bearing rich copper ore in bunches. The work- 
ings on this vein extended 120 fathoms in length, and 26 fathoms 
in depth, while an engine shaft was sunk 36 fathoms deep : and an 
attempt was made to renew them in the beginning of this century, 
but the machinery employed was insufficient to free the mine from 
water. 
142. The tract adjacent to the lower part of Lough Derg, 
(see Plate 7. No. 4.) consists partly of clay slate, and partly of old 
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