_.
<br />---
<br />-- .___
<br />
<br /> ~o~o~~.
<br />~ Gold
<br />itate of The only geolog•ioal survey of the district
<br />i
<br /> ,
<br />s a partial
<br />one contained in the "Geological E
<br />
<br />l of xploration of the Fortieth
<br /> Parallel by Clarence King (1870),
<br />
<br />', Equitable The country rock may be generally described as a gneissic,
<br /> or' banded granite, evith hornblende forming a co
<br />id
<br /> ns
<br />erable con-
<br />' stituent. Intrusions of quartz, and andesite porphyry
<br />common
<br />
<br />
<br />Ontario, Canada ,
<br />-
<br />ly known as porphyry, also intrusions of felsite, are to be
<br /> found occasionally. iI pegmatite dyke, with an easterly dip,
<br />Colorado, cuts the shaft at e depth of about 200 ft,
<br />(O'Neil)
<br />lity,
<br />" The vein^an the 358 ft, level, west, is faulted by an
<br /> andesite dyke, or intrusion, which seems to throw the vein to
<br /> the south for a short distance, after which, it regains its normal
<br /> strike, At the point of throw, the vein enters the andesite,
<br />
<br />;tman, in and is wholly contained within same, up to the present breast,
<br />
<br />and actively a distance of about 100 ft, There is no doubt but what the
<br /> andesite has some bearing upon the ore deposition, as it is
<br /> mineralized, to some extent, on each side of the vein, so far
<br /> as explored, It may be noted here, that in some places, in
<br /> the porphyry, the vein is divided, or split up into three
<br /> distinct mineral streaks, with porphyry as the parting. material,
<br /> The lodes possess a high degree of parallelism in their
<br /> strike, or direction; the coixrse, with but few exceptions, being
<br /> between due east and west, on one hand, and north east, and south
<br /> west on the other, The dip of the lodes, is generally at a
<br /> high angle, but changes frequently vrith depth,
<br /> The veins show little indication of having. filled a fissure,
<br /> as usually understood, but follow the cleavage ,points, and in
<br />pith little some oases, the foliation planes,of the gneiss, and replace the
<br /> country rook on each side of thath, Tha walls of the veins arc
<br />imediate
<br /> usually well defined.
<br />portant
<br />the foot
<br />`+''~~
<br />
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