The Elements of economic geology

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Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Ore deposits

Collection:: Economics Books

CHAPTER VIII ORES OF FIVE MINOR METALS—NICKEL, MERCURY ANTIMONY, ARSENIC, AND BISMUTH Nicker—Uses anp Price—Nickel (Ni; at. wt, 59; sp. gr., 8:4 to 8-8; melting-point, 2650° F.) is a widely distri- buted metal which occurs with native iron in the iron meteorites and must form a considerable proportion of the metallic barysphere. Although early used by the Chinese for coins, it was not discovered in Europe until 1751, and re- mained scarce until the opening of the New Caledonia deposits in 1890, and of the still richer mines at Sudbury In Canada. In 1900 the world's production was 7500 tons; In 1913 Canada produced 21,600 tons, New Caledonia 2700, and Norway 700. During the War the output rose to 40,000 tons, and the price to £200 per ton ; but owing to the stocks then accumulated, the output fell in 1921 to 5000 tons; but it had risen to 36,000 tons in 1925, and the price is now about £170 per ton. Nickelis whitein colour, hard and ductile, and does not tarnish as it is not readily oxidized. Its main use is in alloys, such as nickel-steel, of which the strength 1s largely due to its 3 per cent. of nickel. It lowers the cost of metal structures by reducing the necessary weight. It was long used mainly as German-silver, an alloy of nickel, copper, and zinc. Nickel forms 36 per cent. of invar, a metal used for scientific instruments, as it has the lowest known coefficient of expansion. Grains of a native iron- nickel alloy, Awaruite (FeNi,), are found in serpentine in New Zealand. _ Nickel has often been regarded from its association with ;'ON In meteorites as formed by direct igneous action. It Is chiefly found in sulphides, especially pyrrhotite (magnetic Pyrites), in which it is present as pentlandite ((FeNiS); 8 [13

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