The Elements of economic geology

Bibliographic data

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

ORES OF GOLD 49 far eastward at the level of between 1400 and 1200 feet, descends to the lowlands of Central Australia. The plateau Consists of pre-Paleozoic gneiss and schists invaded by Sranites gpg acid dykes, and by basic intrusions some of Which are now amphibolite and horablende-schist. Some of the micq schists, chlorite schists, and slates were sedimen- “ary rocks. Gold wag discovered in Kimberley in North-western Australi, in 1882 and at Yilgarn, 200 miles E. of Perth, in 188;. Active mining followed the discovery of the gold at Coolgardie in 1892, but was delayed by the scarcity of nr D - _— 50’ - Fra, I4.—THE ASSOCIATED NoRrTHERN Ore-Bopy, KALGOORLIE, The Associated Northern ore-body, at Kalgoorlie (after a: The Primary fault F1 Separates the dacite (D) from altered tuffs (¢). The ore-body wag formed in the tuffs in connection with two subsequent fang (F,, F,). Water. That field proved disappointing as the gold is in shallow, though rich patches. The mining fortune of Western Australi, has been dependent mainly on the Golden Mile at Boulder, Kalgoorlie, which was discovered in 1895, and has deen claimed as the richest square mile known in mining Ristory, The treatment of the complex ores of Kalgoorlie, Neludipg sulphides, sulpharsenates, sulphantimonates, copper Sulphide, and tellurides, was of exceptional difficulty, and Vas Managed by the introduction to mining of many new Processes, including the pebble-mji] and filter-press. The lodes of quartz intergrown with black rock were regarded °Y E. F. Pittman (1 898) as intrusive dykes ; but H. P. Wood. Yard (189g) explained them as due to the ascent through Ssures of gold-bearing solutions which impregnated the ck on both sides, This view was confirmed (1898) by

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