Congressional Document Series

Congressional Document Series

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... under bond to the Little Rockies Exploration Company, which had a force of men engaged in exploration. The mine is said to have produced about $200,000 worth of ore, of which the richer portion was shipped to smelters and that of the lower grade was milled at the Zortman mill on Alder Gulch. A crosscut tunnel reaches the lode some 300 feet from the portal and follows it northward for about 1,000 feet. From this tunnel a raise extends to the surface a distance of about 255 feet, and a winze is sunk near the bottom of the raise to a depth of 250 feet. Levels are turned in the lode at intervals of 50 feet. When the mine was visited the levels 150 feet below the adit were under water. The lode is a shear zone in porphyry. The ore is a brecciated porphyry, replaced and cemented by quartz, pyrite, and other minerals. On the surface the ore is completely oxidized and at places it is partly oxidized 400 feet below the surface. A streak of rich ore composed in part of purple fluorite has furnished a large part of the shipping ore. Some of this ore shows specks of free gold, but part of the gold is a telluride and panning does not reveal its presence until after it has been roasted. The rich streak seems to have undergone more movement than the remainder of the lode and it is as a rule greatly crushed. It is from a few inches up to 2 feet wide, but it has not been found throughout the length of the ore body. The average strike of the lode is N. 12 W. and it dips about 87 W. Its maximum width is 30 feet. The principal ore shoot is just north of the winze, and on some of the levels is about 250 feet long. It has been stoped downward to a depth of about 450 feet. To the north of this ore shoot workable ore has been found here and there in the adit...
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Product details

  • Paperback | 302 pages
  • 189 x 246 x 16mm | 544g
  • United States
  • English
  • black & white illustrations
  • 1236884876
  • 9781236884879