Der Haushalt des Kaufmannsgehilfen

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Monograph

Identifikator:: 178040560X

URN:: urn:nbn:de:zbw-retromon-168007

Document type:: Monograph

Title:: Der Haushalt des Kaufmannsgehilfen

Place of publication:: Hamburg

Publisher:: Deutschnationaler Handlungsgehilfen-Verband

Year of publication:: 1927

Scope:: 64 Seiten, [12] Blätter

Digitisation:: 2021

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: I. Die Besonderheit und das Ziel der Erhebung

Collection:: Economics Books

CHAPTER II THE FORMATION OF DEPOSITS OF USEFUL MINERALS Tue sparcity and local distribution of ores (cf. p. 4) suggested to the earliest students of ore deposits that they must be formed under exceptional conditions. The sea contains in solution most of the metals that are found in the crust; but if the ores were derived from sea-water, as has often been suggested, they should be more widely dis- tributed in marine deposits. Most ores do not occur under conditions that indicate a marine origin. Tin is associated with hot acids appropriate to great depths below the earth's surface, mercury with rocks shattered and displaced by mountain-forming movements, and primary gold with igneous intrusions. History oF Stupy oF Ores—The scientific study of ores was begun in southern Germany. In the eleventh century the chief mines in Europe were those of lead and silver in the Harz Mountains in central Germany. The tyranny of a local duke drove some miners to Saxony, where in 1160 they founded a free settlement—Freiberg. They there discovered mines richer and with more varied metals than those of the Harz; the district was called the Erzgebirge (Ore Mountains), and the working of its complex ores laid the foundations of modern mining and metallurgy. These ore-veins descend steeply into the earth and as a rule become poorer and thinner and subdivide downwards. As in the human body many veinlets collect the blood and lead it into the main veins, so the veins of ore were attributed to many veinlets having collected some metal-bearing fluid on its ascent through the earth's crust. Agricola (De Re Metallica, 1556) established the first scientific mining school TA

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