Tin Deposits of the World: With a Chapter on Tin Smelting

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Mining journal, 1907 - Tin - 304 pages
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Page 8 - These prepare the tin, working very skilfully the earth which produces it The ground is rocky, but it has in it earthy veins the produce of which is brought down, and melted and purified. Then, when they have cast it into the form of cubes, they carry it to a certain island adjoining to Britain, and called Iktis.
Page 45 - ... from the size of a pin's head to that of a pea ; scattered through a large body of sand or clay ; and in this state it is called by the Mandingoes sanoo munko,
Page 118 - The conglomerate is not of sedimentary origin, but has apparently been formed by the alteration in situ, and" subsequent cementation of the underlying rocks. In some portions of the field this conglomerate (as is only to be expected from its mode of origin) carries a certain quantity of tin. The ore, however, is not evenly distributed throughout, but seems to be concentrated in certain comparatively isolated patches. The tin from this conglomerate cannot be extracted by the ordinary process of washing...
Page 138 - ... and their average width is greater within 100 fathoms from the surface than at any greater depth hitherto attained. Henwood furnishes the following figures as the result of his investigations relative to the thickness of Cornish lodes : — Lodes yielding ores of both tin and copper average 4'7 feet in width, tin ores „ 3'0 „ copper ores . 2'9 „ „ in granite .....„ 31 „ „ in slate . . . , 37 „ „ at less than 100 fathoms deep . „ 3'9 „ „ „ at more „ „ „ . „ 3'3...
Page 67 - The open-cast system was the only one adopted by the old miners . . . the sides of their working were sloped or terraced to keep them from falling in. This, and not the thickness of the lodes, accounts in many instances for the great width of the old workings. . . . Explosives of any description were never made use of, owing to a strange superstition firmly believed in by the Chinese, viz., that the use of explosives frightens away the metal in a mine. In consequence of this, any very hard ground...
Page 78 - ... interest in New South Wales was aroused by the accidental discovery of tinstone, by the Messrs. Fearby, at Elsmore, near Inverell. Mr. Cleghorn, of Uralla, had sent the Messrs. Fearby to prospect the creeks of this district for gem-stones, the best localities for which were pointed out to them by an old shepherd on Newstead Station, named Wells. Mixed with a number of sapphires and other gems, in the gravels of the creeks, was a heavy black mineral, in water-worn grains, which the Messrs. Fearby,...
Page 297 - Tin : Describing the Chief Methods of Mining, Dressing and Smelting it abroad ; with Notes upon Arsenic, Bismuth and Wolfram. By ARTHUR G. CHARLETON, Mem. American Inst. of Mining Engineers. With plates, 8vo, cloth, 12s.
Page 180 - Buhner t'reck, a tributary of the Anikovik, and on Buck Creek, a tributary of Grouse Creek which flows through Mint River into the Lopp Lagoon. Tin ore has also been reported from a great many other localities which have not been thoroughly examined by geologists. The tin deposits, as far as known, do not follow any definite system, and are confined to no particular belt or zone. The ore, either in lodes or in placer deposits, has been found in association with all the sedimentary formations above...
Page 27 - The tin occurs in the alluvium in different ways. Sometimes it is scattered through it from top to bottom in comparatively uniform quantities ; sometimes it is in layers of rich ore separated by layers of lean or barren ground ; sometimes it is richest on the bed-rock, and at other times higher up in the deposit. As a general rule, however, there is a covering, or
Page 94 - The deposits of ore seldom lie along a well-defined course between the walls of country rock, but are as a rule distributed through it in an irregular manner, forming bodies of very varied size and shape. The lode material is only in exceptional cases separated by well-marked planes of division from the enclosing country. As a rule it merges into it, with a gradual change from lode material to barren rock. The lode material is in almost all cases evidently...

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