The Mineral Industry, Volume 18

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Scientific Publishing Company, 1910 - Mineral industries
 

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Page viii - Silver: 5 francs. Gold: 5, 10, and 20 marks. Gold: sovereign (pound sterling) and J^ sovereign. Gold: 5, 10, 20, 50, and 100 drachmas. Silver: 5 drachmas. Gold: 1, 2, 5. and 10 gourdes. Silver: gourde and divisions. Gold: sovereign (pound sterling). Silver: rupee and divisions. Gold: 5, Mi, 20, 50, and 100 lire.
Page 527 - For wall papers and brocade paints a ground mica with a high luster is required, and such luster is best obtained by using a clean light-colored mica and grinding it under water. Coarsely ground or "bran...
Page viii - The coins of silver-standard countries are valued by their pure silver contents, at the average market price of silver for the three months preceding the date of this circular. tThe "British dollar...
Page 527 - Insulation for commutators is generally cut from " amber " mica board. Scrap mica, or mica too small to cut into sheets, and the waste from the manufacture of sheet mica are used in large quantities commercially. The greater part is ground for the manufacture of wall papers, lubricants, fancy paints, molded mica for electrical insulation, etc. Ground mica applied to wall papers gives them a silvery luster. When mixed with grease or oils mica forms an excellent lubricant for axles and bearings. Mixed...
Page 692 - ... tables) make four products: a finished concentrate, a first middling which is returned to the head of the table, a second middling which goes to the Wilfley slimers and a tailing. Tables Nos. 3 and 4 make two products — a finished concentrate and a tailing for the slimers. There are five 12-foot Wilfley slimers. The slimes from the five concentrating tables are brought together in a tank and distributed to four of the slimers, each of which makes three products — a finished concentrate, a...
Page 527 - ... to cut into sheets, and the waste from the manufacture of sheet mica are used in large quantities commercially. The greater part is ground for the manufacture of wall papers, lubricants, fancy paints, molded mica for electrical insulation, etc. Ground mica applied to wall papers gives them a silvery luster. When mixed with grease or oils mica forms an excellent lubricant for axles and bearings. Mixed with shellac or special compositions, ground mica can be molded into desired forms, and is used...
Page 532 - ... porphyry and granite in the Shepherd, Murphy, All Nations and Packetts sections of the Middlesex district, Devon County. It has also been noticed at Heemskirk, Mt. Ramsay, Mt. Morris, Schoutin Island, Cape Barren Island and Branxholme. No information is available as to the extent of these occurrences. New Zealand. — Molybdenite was discovered in 1898 at the Iron Cap mine at Tarauru, Thames, where it occurs in nests and small strings near an ironstone vein. Individual fragments carry about 40...
Page 283 - ... belts and include (1) those of Myrtle, Marion, Missouri, and Gold creeks; (2) those of Vermont, Nolan, and Emma creeks; and (3) those of Mascot Creek. Up to 1907, when the deep placers of Nolan Creek were discovered, mining was confined to shallow deposits. In 1909 probably 90 per cent of the gold was taken from the deep gravels of Nolan Creek. The Koyukuk district is difficult of access and mining costs are high, but in spite of the adverse conditions the value of its gold output in 1909 was...
Page 533 - Ferro-molybdenum containing 50 per cent, of molybdenum is offered at about $s. gd. per Ib. EXTRACTION OF MOLYBDENUM FROM ITS ORES. There are two methods in general use for the reduction of the ore : — The alumina-thermic process yields a product free from carbon, but containing small quantities of silicon and from 1 to 2 per cent, of iron. Alloys with chromium and nickel are also made by this process. The electrical process is worked by heating the ore in- a carbon tube, employing a current of...
Page 692 - ... products. The coarse goes to two No. 5 Wilfley tables, the middlings to a No. 3 Wilfley, and the slimes to two other No. 3 Wilfleys. Tables Nos. 1 and 2 (the No. 5 tables), make four products: a finished concentrate, a first middling which is returned to the head of the table, a second middling which goes to the Wilfley slimers, and a tailing.

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