The Elements of economic geology

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Monograph

Identifikator:: 100624364X

URN:: urn:nbn:de:zbw-retromon-33077

Document type:: Monograph

Author:: Merckel, Curt http://d-nb.info/gnd/1024684814

Title:: Der Weltverkehr und seine Mittel

Edition:: Zehnte, durch einen Nachtrag ergänzte Auflage, Sonderausgabe aus dem Buch der Erfindungen, Gewerbe und Industrien

Place of publication:: Leipzig

Publisher:: Verlag von Otto Spamer

Year of publication:: 1913

Scope:: 1 Online-Ressource (X, 981 Seiten)

Digitisation:: 2017

Collection:: Economics Books

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

ORES OF GOLD Ly, The propylitic origin of some gold explains the contro- VEIsy as to whether dykes enrich or impoverish adjacent lodes. A lode may be poor where in contact with a dyke and rich where separated from it, and vice versa. Such Apparent inconsistencies are explained by the AI Mine at Wood's Point in Victoria ; it consists of horizontal floors of Juartz in hornblende-porphyrite ; where that rock is normal the quartz is barren, but where the rock has been altered 0 propylite the quartz-floors are auriferous. The gold is due to the Propylitization and not to the dyke. Tur CLassiFicaTIoN OF GoLp Ores Gold, owing to its ubiquitous distribution is found m2 sreat variety of gre deposits. Excluding some of the important occurrences in contact deposits, and as an gh 0 constituent in many sulphides the chief ores may be classifie as follows :— Sect, A—Primary_ L Gold-quarty F issure Lodes— (a) In sedimentary rocks, California ; Ballarat. S (5) In gneisses and schists. Mysore; Brazi 1 Rhodesia, (¢) In volcanic rocks, Rocky Mountains ; New Zealand, (d) Pneumatoly tic, Cripple Creek; Passagem, Brazil, (I Isolateq Gold-quarts Veins i Saddle and Ladder Lodes— (a) Saddle-lodes, Bendigo; Nova Scotia. as. Vi (0) Ladder-lodes, Wood's Point + Little Bendigo, Vic- toria ; Berezovsk. {¢) Radial-lodes, Charters Towers, III. Impregnations and Replacement Bodies. Homestake, N. Dakota ; Alaska Treadwell ; Kalgoorlie, W. Australia ; Porcupine, Ontario. Sect. B—Secondary enrichments. Londonderry, W. Aus- tralia; Mt. Morgan, Queensiand, Sect, C—Ailuyigg Deposits— Surface drifts and leads. Deep leads, Victoria and Kanowna., Marine placers, 5 Ancient placers. Rang Banket; Gold Coast ; . Dakota; Morro Velho, Brazil.

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