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

38 ECONOMIC GEOLOGY of New Zealand and at Nome in Alaska : but the most im- portant is the Witwatersrand Goldfield in the Transvaal, the most productive goldfield in the world. The South African goldfields have been worked from prehistoric times in Rhodesia, which is often regarded as the Ophir, whence Solomon obtained the gold for his temple. The gold in the Rand ore, though very rich, is in such minute particles that it is rarely visible and produced no noticeable alluvial de- posits. The ore was discovered in 1885, at Langlaagte, near Johannesburg, and the auriferous conglomerate was followed SW - 2 _ = ~~ XX IYI ~ 2: pu a ————— cr TF Karroo beds. Pretoria system, Ventersdorp system. Upper part of Witwatersrand system. — en ‘~ NE io >| | Z. nA ><, F1a. 19.—SkcrioN Across THE RAND GoOLDFIELD, during 1886 for miles E. and W. Johannesburg was founded in 1887. A boom in 1888 was followed in 1889 by a panic due to the discovery that much of the ore was low grade, and that the minuteness of the gold rendered its recovery difficult by the methods then used. The local coal discovered in 1887, the regularity of the ore in bulk, and the opportune discovery of the cyanide process, rendered the mining easy and profitable. The Rand Goldfield is a large synclinal basin (Fig. 10) of pre-Paleozoic rocks. Both to N. and to S. are granites, of which the northern is intrusive into schists containing

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