The Journal of the Canadian Mining Institute [microform]

Download or read book The Journal of the Canadian Mining Institute [microform] written by Canadian Mining Institute and published by Institute, [1898?-19--]. This book was released on 2010-03 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ... Zymoetze or Copper river including Hudson Bay Mountain, and the other is located on the Babine range between the Bulkley and Babine Lake, near the headwaters of Driftwood Creek. These two latter districts differ from the first-named inasmuch as a number of galena leads have been located in them, whereas on the Telkwa district that mineral is seldom seen. On the Telkwa river the ores consist chiefly of copper, and occur in a variety of ways. At times they are found occupying fissures where the country rock has been shattered near the intrusive granitic rocks; this is particularly noticeable in Hunter's basin at the head of Goat Creek. Replacement along crushed zones is another common form of ore deposition, and again in places the later dikes themselves are mineralized, and in other cases although the dikes appear to be barren, the porphyrites along their contacts are mineralized; one such case, that of the Black Jack and Dominion claims in Dominion basin, which came under the writer's notice showed a strong dike about 45 feet wide cutting nearly vertically the porphyrites, themselves dipping at low angles. The brown trap of the dike seemed to be quite barren, but in certain beds of the volcanics, which were more readily decomposed than others, the country rock had been replaced by quartz, calcite, epidote and ore, which alteration appears to have followed the bedding planes, reaching its maximum intensity near the walls of the dike and gradually decreasing laterally from them. It will be seen from the above that uniformity in the manner of ore deposition is not to be looked for; probably the most common form is when the large dikes are themselves mineralized, especially along their walls, in such instances the adjacent por-phyrites are in most...