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

88 ECONOMIC GEOLOGY Mt. Lyell schists (porphyrite lavasand volcanic ash which have been crushed into sericite schist), with the massive conglomer- ates and quartzites of the West Coast Range of Tasmania. The conglomerates are probably Devonian and occur E. of the Mt. Lyell schists, which are thrust over the conglomerate by a long and complex fault, associated with cross- faults and thrustplanes. In places wedges of con- glomerate have been thrust into the schists. The Mt. Lyell Mine is in a bay of schist which has been nipped between three faults, and was so shattered that it was completely permeated by ore-bearing solutions. The ore is an irregular boat-shaped mass of iron pyrites which contained over seven million tonsa It was at the surfac: 800 feet long by 200 feet broad; it widened below to 300 feet, but at lower levels decreased in size, and ended abruptly, at the depth of about 750 feet, over the under- thrust conglomerate. The ore on the footwall side contained about 2-35 per cent. of copper with a little gold and silver; its richness was probably due to the solutions being nearly stagnant and giving time for the precipitation of the metals. The ore along the hanging wall was so low grade that it only paid to mine as fuel and Lf

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