National banking under the Federal Reserve System

The Elements of economic geology

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Monograph

Identifikator:: 893136298

URN:: urn:nbn:de:zbw-retromon-77125

Document type:: Monograph

Author:: Preisigke, Friedrich http://d-nb.info/gnd/116281871

Title:: Girowesen im griechischen Ägypten, enthaltend Korngiro, Geldgiro, Girobanknotariat mit Einschluss des Archivwesens

Place of publication:: Strassburg im Elsass

Publisher:: Verlag von Schlesier & Schweikhardt

Year of publication:: 1910

Scope:: 1 Online-Ressource (XVI, 575 Seiten)

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

ORES OF IRON 31 to their high content of titanium, which can only be washed out by melting with large quantities of flux at an extrava- gant cost for fuel. The price of fuel is an important element in iron smelting as from 3 to 4 tons of coal are required to smelt one ton of iron. Electric smelting where there is ample water-power renders possible the working of deposits where cheap fuel is not available. Iron ores are of unusual variety. They include materials which have been formed as igneous rock; as veins formed by ascending water and volcanic vapour; as replacement deposits formed at all depths by rising and descending solu- tions; as bedded ores deposited chemically or organically in sea, lakes, and swamps. The bulk of commercial iron ore has been formed by reactions which take place on or near the surface. CLASSIFICATION OF Iron ORES L. Igneous Ores. Titaniferous Magnetites. II. Contact Ores, e.g. Elba and Western America. LIL. Primary Lodes, e.g. Siderites of Czecho-Slovakia. IV. Replacement Ores— Pyritic masses. Rio Tinto, etc. 2. Oxide Ore-Bodies due to Descending Solutions — (@) In limestones... Cumberland. ) Bilbao. Lake Superior. Gellivaara and Adirondacks. (e) Mid-Sweden. 3. Ancient surface sheets. Kiruna. V. Bedded and Organic Ores— I. Aqueous precipitates. Minette of Lorraine; Clin- ton; British Mesozoic ores; Wabana, etc. Altered representatives—banded ironstones, ita- birite, etc. 2. Carbonaceous. Blackband ores. 3. Bog Iron ores. VI. Surface Ores— Efflorescent residual ores and alluvial. Laterites. Brown iron ores in residual clays. Black iron sands. |

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