22 About 300 feet below the tunnel the vein passes from the granodiorite into the surrounding sediments. The vein continues strong and exhibits characteristics similar to those on the granitic side of the contact. Analysis of Sample of Arsenical Ore, from the New Hazelton Gold and Cobalt Co., Ltd., New Hazelton, B.C Silica and insoluble silicates................0.. cc cece cc tcsseeeeess 13-70 per cent ETON ich. Shak Pa ae SE OEE ee OUR PR ne ced Aen ‘7 O8iae ass Arsenic. . 55-53 ‘ Cobalt... 4-40 Sulphur.... pr a 4-00 : Lime...... f 3 ZVWE Magnesia 0-90 im _ 98-58 Gold, 4:36 ounces a ton = $87.20 Silver, 3-60 ounces a ton = 2.77 Specific gravity, 5-66 Paragenesis of Ores. The ore from the main vein on the Hazelton View property is mined for its molybdenum and gold values. It contains, besides these metals, a large amount of arsenic, iron, and cobalt, and some silver, which are combined in a group of minerals whose association is most unusual if not quite unique. The gangue in which these minerals are found is similar to that of the Rocher De Boule veins, since it consists chiefly of hornblende with a small amount of quartz. Feldspar is also found in the vein, but it is thought to be supplied by the crushed wall rock. The metallic minerals present, named in the order of their abundance, are: arsenopyrite, safflorite, léllingite, molybdenite, native gold, a little chalcopyrite, and probably some electrum or telluride carrying silver. The arsenopyrite is usually coarsely crystalline and is replaced by safforite, léllingite, molybdenite, and the gold and silver minerals with a little chalcopyrite. It is later than the hornblende and is often seen in veins cutting through the latter. The safflorite is found chiefly in the arsenopyrite which it replaces, but a considerable amount also occurs as irregularly shaped grains in the hornblende. It differs from the arsenopyrite in having a slightly whiter colour, a smoother surface in the polished section, and a lower relief due to its slightly less hardness, also by its apparent inability to develop crystal faces against the gangue which it replaces. This last habit is in marked contrast with the arsenopyrite which invariably develops sharp, brilliant, crystal faces against the hornblende. The safflorite was determined in the polished sections chiefly by its behaviour on treatment with ferric chloride. This reagent etched it very slowly, developing a pronounced cleavage in one direction. This single, strong cleavage served to distin- guish it from smaltite which is isometric, the safflorite being orthorhombic. Léllingite is fairly plentiful and is closely associated with the arseno- pyrite, though their relative ages were not determined. It is very similar to the arsenopyrite, but is distinguished by its comparative indifference toward nitric acid. The molybdenite is fairly plentiful and much of the material mined forms good molybdenum ore. ree The molybdenite is seldom found in the arsenopyrite, but is freely disseminated in the hornblende as small flakes and crystals. Its relation to the arsenopyrite seems to indicate that it is later in order of deposition. The gold occurs as small grains scattered through the arsenopyrite and safflorite, and, excepting a very small amount which was seen in the quartz, ~~ 1Analysis by James G. Powell, Provincial Assayer. sparta