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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Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Ore deposits

Collection:: Economics Books

(28 ECONOMIC GEOLOGY tin lodes and at higher levels. The main production in tecent years has been in the United States, which had an output in 1924 of 13,000 tons; France was second with 10,000 tons; England produced 3200 tons from the Cornish copper mines, BisMUTH Bismuth (Bi; at. wt, 208; sp. gr., 9-8; melting-point, 520° F. ; it expands 2-3 per cent. of its volume on solidifica- tion) is a white hard brittle metal, which is the most strongly diamagnetic of the elements. It is chiefly found native or as the sulphide, Bi,S,, bismuthinite. It is used mainly for making fusible alloy, drugs, and pigments; as the demand for it is limited and closely controlled production is small. It is usually of deep-seated formation, and occurs in quartz- veins associated with tin, tungsten, copper, gold, cobalt, and uranium. As both the sulphide and carbonate are relatively insoluble bismuth ores are not readily concentrated in the surface zone. Owing to its insolubility it occurs in alluvial deposits, and is obtained in Southern China from tungsten placers. Saxony once had almost a monoply, but its yield has become insignificant; the main supplies come from Queensland, where it is obtained as a bye-product from the tin and tungsten placers, and from Bolivia, where it is obtained from tin mines. The price generally varies from between 8s. 6d. to 12s. 6d. a lb.

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