41 



Similarly, the ore-bodies occur in lens-sliaped masses, connected Case 57 

 by the ore-channel. The ore in general is a glassy quartz with 

 iron- and copper-pyrites. Blende sometimes occurs, as in 2331, 

 from the Currajong Mine. 



1275, from CuUingar, a gold ore assaying 4 oz. to the ton. 

 It contains pyromorphite — the earthy yellow substance — a 

 mineral which consists of lead combined with phosphoric acid and 

 chlorine and is not often associated with gold. 



7325, from near Harden : yet another instance of gold in 

 granite country. The specim^en, a similar piece to which assayed 

 2| oz. of gold per ton, shows a vein of quartz with galena and 

 arsenical pyrites ; a portion of the granite country rock is still 

 attached. 



Cooma, Klandra, NimityheUe. — 8733, bleached felspathic rock 

 from the Big Badja Hiver. The gold here must be contained in 

 the rock itself, as it will be noticed no quartz or ferruginous veins 

 are present. 



8579, Middle Flat, Cooma, shows gold seated on blende. 

 Several instances of this mode of occurrence have been already 

 mentioned (page 29). 



Particular attention might be given to the ores from Bushy Hill, 

 Cooma. 9067, Willmott's Claim (135-ft. level) ; a pretty little 

 specimen, consisting essentially of galena and pyrites, showing 

 free gold richly. The country-rock is very remarkable, the only 

 similar instance being 8610 from Caloola (see page 35). It is a 

 quartz-felspar-porphyry — i.e., an intrusive igneous rock, not a 

 fissure lode. Under the influence of stupendous pressure within 

 the Earth's Crust — due to the movements which give rise to 

 mountain chains — the porphyry has been rolled out to such an 

 extent as to give it a slaty structure. The quartz and felspar 

 crystals have been flattened out into lens-shaped masses. 

 Another effect of this rolling out and stretching has been to pro- 

 puce spaces in which, at a later date, water has deposited the 

 metallic ores. 9272 shows the rock in its normal condition, 

 8535 after weathering. 



