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the
850-ft. level, but of others extending southwards and upwards in lines
pretty well parallel to that of the wing worked. Not only are there
immense quantities of this series of wing quartz, but to the east and
west of the line worked are many unsampled vertical formations, all of
which are associated, more or less, with lines of gold-slate drainage.
In fact, only one comparatively rich line of obstruction to the golden
drainage of one belt of golden slate has received attention, and this
attention was, as far as concerns its mining, of the crudest, for the
efforts of the past have been directed to following and tearing out the
richest parts of the line of obstruction, leaving many thousands of
tons of quartz that would pay if handled in bulk.
As
a consequence of the varying amount of the displacements in connexion
with the numerous breaks in the rock folds along the line of the lode
country of Egerton (see Fig. 5), the line of the obstruction to the
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slate
drainage, in the mined part in the Black Horse mine, pitches to the
south at an angle from the horizontal of about 22°. The whole of the
country along the line worked pitches, in my opinion, to the south. The
general opinion among mining men, however, is that it pitches north,
but I am inclined to think they have mistaken the pitch of the wing of
quartz coming down north from the Rose workings as representing the
pitch of the country. I have found, as a rule, that the general pitch
of all such wing " makes " is at right angles, or thereabouts, to the
pitch of their country. It was really from the 600 feet of the line of
gold deposit of Egerton that the Black Horse Company obtained all its
gold, the major part of its works to date being confined to it. I note
that there was here less of a twist strain applied in producing the
cracking of the corrugated rock beds, but the main line of drainage
kept well to the slate country, and, as usual, between the
squeezed-together arches. This line of drainage, which appears to be a
continuation north of the west vertical from which the wing made out
east in the Rose workings, shows here in narrow form, averaging in
width about 4 inches, composed of laminated quartz containing mundic,
but, as far as I could learn, no gold. In places, dyke material is
associated with it, and this appears to have vied for position with
quartz formations on its eastern side.
Here,
in the Black Horse area, the twist strain has resulted in forming
receptacles for quartz formations of the wing order, but having the
wings going down more nearly vertical. The nearer such wings were to
the vertical lode, the richer in gold were they found to be. Thus the
thin vertical lode
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