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_. <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 />