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.1908 Excerpt: ... old workings are closed now on account of being dangerously situated on the steep clay and sand bank of the river, subject to mud slides. The old slope was down about 350 feet with rooms run off it, the seam in the lower rooms being three and a half to four feet wide. The new slope now being sunk is to the north and in safe ground, and at the time visited was down about 525 feet, dipping to the east at 16. This seam, which is not the same as that mined in the old workings, was at this depth about two feet wide, and was apparently becoming wider. It had previously narrowed to about six inches. An average sample of the two feet, analysed by Dr. Hoffmann, gave:--Water '4 26% Volatile combustible matter 40 26% Ash 1081% Fixed carbon 44 67% Coke per cent 55 52% The coke is a firm coherent coke. These measures are not the same as those at the Tantalus mine which appear in the valley about three and a half miles to the east of the Five Fingers mine, and also up a small creek about three or four miles to the east from the Five Fingers rapid. OEOLOGY. Gkneral. In studying this portion of the Yukon, as in portions of British Columbia to the south, a striking similarity in the geology is noticed in a north-west and southeast direction, all the main horizons extending parallel to the Pacific coast line. The principal geological formations have been placed in the following divisions, beginning with the oldest:--Schists.--Lying next the granites along the western edge of this district, in places, are some schists, chiefly chloritic, sericitic and hornblendic, and sericitic and schistose quartzites, which are probably the oldest rocks observed this season. Lower Cache Creek series.--This series consists of cherty quartzites, slates, argillites, altered diabases and basic ...
"Sobre este título" puede pertenecer a otra edición de este libro.
(Ningún ejemplar disponible)
Si conoce el autor y el título del libro pero no lo encuentra en IberLibro, nosotros podemos buscarlo por usted e informarle por e-mail en cuanto el libro esté disponible en nuestras páginas web.Crear una petición