SAG We Ce ROMS eR ss er anes

COPPER SILVER VEINS OF TELKWA DISTRICT. 39

Limonite, Covellite, Azurite, Malachite.

The proximity of these veins to the batholith, their association with the altered volcanics which persist along the contact, and their extension into the granodiorite itself are considered as strong evidence that the veins are derived from solutions which emanated from the intrusion. The presence of gold and silver with lead, copper, antimony and zinc; the association of pyrite, galena, chalcopyrite, tetrahedrite and zinc blende; the absence of any large amounts of arsenic, molybdenum and such oxides as magnetite, hematite and ilmenite or such silicates as biotite, pyroxene, amphibole and tourmaline, and the general simplicity of the deposit are all evidence that these veins were formed by heated solutions at intermediate depths.

THE VEINS SITUATED IN THE VICINITY OF THE GRANODIORITE SiN RUSION AL PEE CORE OF fie TELKWA MOUNTAINS.

The deposits of this group contain much more copper and silver than those of the first, and include the most promising claims of

the district. Besides their greater economic value, they also pos-

sess a greater scientific interest because of the complexity and singularity of their mineral associations and types of structure.

The group consists of ten or more slightly developed claims. From three of the number, enough ore has been extracted from small tunnels and open pits to make smelter shipments.

The situation of these deposits bears a direct relation to the contact of the granodiorite intrusion, in that they form a ring around the stock, none of them being farther than 114 miles and none nearer than a mile. They are also situated just outside of a zone of intense metamorphism which surrounds the stock. Al- most all the claims are at an elevation of about 6,000 feet and all happen to be exposed just where the steep walls of the glacial valleys intersect the gentle slopes of the old upland.

The deposits are characterized by an abundance of bornite,

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