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

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

Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Ore deposits

Collection:: Economics Books

ORES OF GOLD 43 k haft was sun Other where similar conditions recur. co and i iclinal axis, or ] ft was ¢ oe Fi oy was being mined py being shallow, down h : t saddle. The field, bunteny as for long the down to he mts depth of 4500 feet, and of gold declined tes a in the world. The was too high tn d ih robably because the tempe to Sold OF Castles for rien Ida sition. In the neighbouring but the lodes og: : diggings» were os upper part a ear ation, ee Id drs, eyed by denudat lower parts have ) underground, f Nova Scotia have been Jeseribed i! Maley dde Cn Mem. 20, 1912), but N o d like low grade. tz-veins arrange 1 isolated quartz ical or steeply a A ole ke. ‘The typical Star. Wood's Point. The dykes i; oe it po at the Morning Star, Woo oy shrinkage caused ns Site ian slate; as they cooled ¢ te forming floors horioons Leracks which wert flea Wh quarts, fore Fangs hich | > vertical section of the a firmly frozen of 0 ad : * Oconsionally. where the dy tha slate, and the : the il a crack would extend CE dyke. A small . tz-loos rose a few feet beyond | o, Ballarat. Less lade 1 d was worked at Little Bendig es, where the gold ng fours of quartz occur at the Al 3 rrtuet into the Was irregular in distribution, as 3 wa hich converted the uartz by superheated solutions w osaic of secondary oor h bene into propylite, and Samed od chlorite. The gold : tty d felspar, epidote, zoisite, an opylitized bands. ib where the quartz-floors cross ry pr 74 Berezovsk in . occur in the goldfie ite known as the ar Mone in dykes of a micrograni i . illustrates haters Towers Goldfield in Jromnsna) i co untry . . oe isol ted quartz- AEDs radia a rae of option of fol a circular series of short m UATLE. ] ; filled by gold-q Home eanihich have ben fled by gold quarts.

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