12 The gangue minerals associated with these are hornblende, glassy quartz, banded milky quartz, and small amounts of calcite, siderite, and tourmaline. The hornblende greatly exceeds in amount all of the other gangue minerals. Tourmaline was found in only one or two places and in quite small amounts. Two types of ore are found in this mine which differ markedly in appearance and mineral composition, and which usually occur in different parts of the mine, though in one or two places the two kinds were found in contact. The more plentiful of the two types and that which produces the bulk of the copper may be called the chaleopyrite-hornblende ore, for these two minerals constitute fully 90 per cent of the vein material. The chalcopyrite is usually in great excess over the hornblende, and conse- quently this is an unusually rich copper ore. The other type consists of large quantities of banded milky quartz with relatively small quantities of zine blende, tetrahedrite, galena, and chalcopyrite. The silver content is more valuable than the copper and this ore will, therefore, be referred to as the silver-lead ore. It is largely confined to No. 2 vein and is best developed in the 1202 drift to the west of the main tunnel. Chalcopyrite-hornblende Ore. This ore contains, besides the chal- copyrite and hornblende, a considerable amount of pyrrhotite, arsenopyrite, pyrite, magnetite, tetrahedrite, and molybdenite. A fairly large amount of quartz occurs in some of the ore-shoots, but it is distinguished from the quartz of the silver-lead ore by having no banding, and by being clean and glassy instead of milky. The tourmaline is very subordinate in amount and may be considered only as a rare gangue mineral in this deposit. Cal- cite and siderite are much more common. ‘The group of minerals as above enumerated strongly suggests high temperature deposition. The chalcopyrite presents nothing unusual in its appearance either in hand specimen or under the microscope, and large masses of it seem to be quite homogeneous; however, Mr. J. D. Galloway, of the British Columbia Bureau of Mines, claims that analyses show it to vary consider- ably from the theoretical composition CuFeS:. It is associated more closely with hornblende than with any other mineral, and was frequently seen replacing crystals of hornblende in a manner similar to that shown in Plate IVA. On the other hand numerous places were observed in the polished sections where fringes of actinolite followed the contacts of the chalcopyrite, and feathered out in a manner which clearly shows it to have been deposited later than the chalcopyrite. This is shown in Plate IVB and it will be observed that this actinolite is also later than the pyrrhotite and magnetite. The chaleopyrite was seen to have replaced magnetite, pyrrhotite, pyrite, arsenopyrite, molybdenite, and quartz. It was found to be replaced by molybdenite and, in the proximity of the silver-lead ore, by arsenopyrite, tetrahedrite, and galena. Occasionally tetrahedrite is veined by chalcopyrite (See Plate VA). The replacement by arsenopyrite is shown in Plate VB. The chalcopyrite which forms a large shoot in vein No. 2 is fractured and sheared, the cracks being filled with calcite, and in the same specimen calcite was observed which was clearly replaced by chalcopyrite. Pyrrhotite was found in all the big chalcopyrite ore-shoots, but seemed to be much more plentiful in vein No. 4 than in No. 2, though it was observed in the latter in the 1002 stope. It occurs as irregular masses in the chalcopyrite, and some evidence was found to show that it was