‘ calcareous fpar, which prefects a fmall but
* very diftin£t vein, of galena, intermixed
‘ with fluor fpar.
‘ This indication, which was regarded as
‘ very promiftng in a mountain which con*
c tained feveral other lead mines, determined
‘ E* Pedley, and his aflociates, to commence
‘ their operation; but fcarcely had they
* reached the depth of twelve feet, when
* the limeftone terminated, and they had,
* the misfortune to meet with the channel*
‘ As till then there had never been any in*
* ftance of the moft flender veins of metals
* being found in this unproductive ftone,
* they would immediately have difeontinued
‘ their labours, had not the fame vein of
‘ galena, which they traced through the
‘ limeftone, continued its courfe in the
* channel or trapp. This appearance was
‘ fo' extraordinary and novel, that, feduced
* by it, the miners purfued the ore in the
‘ channel
( channel to the horizontal depth of ninety
‘ feet, in the conftant hope that the vein,
* which never exceeded an inch in thick-
* nefs, would foon enlarge its dimenfions.
* But the farther they proceeded, the trapp
* became fo hard, and it required fo much
‘ labour and expenle to cut through it, that
‘ Elias Pedley told us he was on the point
‘ of altogether abandoning the work. This
‘ bed of trapp was little more than feven
‘ feet thick, but it is very probable it ex-
‘ tends a great way Into the mountain, when
* it is confidered that the gallery has already
? been carried ninety feet in an horizontal
‘ line, without difeovering any appearance
* of alteration.
* This bed of channel, or cat dirt, is
i really a greenifli trapp, very hard in the
‘ interior of the mine, but upon being taken
‘ out of the gallery, and expofed for fame
4 time to the atmofphere, it becomes friable,