Die Einlagen der nützliche Mineralien & Felsen; ihre Herkunft, Form und Inhalt. sive Gruppe in hornblende -, Chlorit- und Aktinolith - amphibolite. Nach der Schiefrige Gruppe Krusch ist auch nicht einfach. Sorge - ing das Alter dieser verwandelt Eruptives, es ist wahrscheinlich, dass nicht onlyolder Felsen aber Jüngere auch gelitten Verformung. Das gold lodes von Kalgoorlie sind eng mit dem amphi-bolites verbunden. Obwohl das Alter dieser Felsen zur Zeit nicht definitelysettled, dennoch, nach Krusch, aus dem Auftreten von thedeposits und die Art der Befüllung, es

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The deposits of the useful minerals & rocks; their origin, form, and content . sive group into hornblende-, chlorite-, and actinolite-amphibolites.According to Krusch the schistose group is likewise not simple. Concern-ing the age of these metamorphosed eruptives, it is probable that not onlyolder rocks but younger also suffered deformation. The gold lodes of Kalgoorlie are intimately associated with the amphi-bolites. Although the age of these rocks at present cannot be definitelysettled, nevertheless, according to Krusch, from the occurrence of thedeposits and the nature of their filling, it may be fairly safely concludedthat the W^estern Australian gold lodes belong to the young gold-silvergroup. Only exceptionally are they simple fissure-fillings : more usuallythey are composite lodes, ^ that is, they are veined zones consisting of a largenumber of small fissure-fillings of fairly parallel strike, from which anintense impregnation and replacement of the country-rock proceeded.Quartz and metalliferous minerals were thus introduced, often in such ^ Ante, p. 40.. THE YOUNG GOLD-SILVEK LODES 593 amount that the country-rock became entirely replaced. In this mannercompact bodies of quartz with disseminated mineral often arose such asmight at first sight give the impression of being simple lodes, while in reahtythey were formed chiefly by replacement. In such cases it could be seenupon closer investigation, however, that there existed no sharp boundarywith the country-rock but that on either wall both silicification andmineralization gradually diminished. Such lodes are illustrated in Figs.53, 54, and 55. In width they sometimes attain several metres. The lodes in general strike north-west, and in spite of repeated junctionsare broadly speaking parallel. According to Krusch, they may in thecentral district be divided into three groups. Of these the first and westerngroup includes the lodes in the Ivanhoe, Golden Horseshoe, Great BoulderProprietary, Great Boulder Main R

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