39 



favourable indication. At the Klondjke it occupies rectangularly- Case 55- 

 disposed cracks in quartz, and thereby assumes a leafy form. A. 

 piece of native copper with a rectangular bend, and quartz 

 showing the same mineral, are exhibited. 



The remaining ores are sulphides from the deep levels, ISuch 

 ore is reached sooner or later in all the mines, and is sometimes 

 of great richness, 9063 assaying 20 oz. of gold per ton. The 

 chief constituent of the sulphide ore is pyrite ; galena is not 

 uncommonly present (9144) ; blende and copper pyrites occur 

 occasionally. 9141, from a depth of 300 ft. in the Lucknow Mine, 

 shows pyrites that has been grooved and polished — slickensided* 

 — by movements of the walls of the lode ; free gold has been 

 deposited in films upon the polished surface at a later date. A 

 block of rich ore from the Lucknow Mine is shown in case 125. 



Temoraf, Gundarjai. Waqga, Sfc. — In this group will be 

 noticed several instances of free gold coating clay-slate, viz., 

 6549, 2134 from Cowabbie ; 2135 from Grong Grong, and 2156 

 from Barmedman. 



Crystallised gold from Grong Grong is shown in gold-case {HO 

 (see page 26). 



6984, Bongongolong ; magnetic pyrites with free gold Ejeatod 

 upon it; an unusual mode of occurrence. 5810. Ph. Burra, Co. 

 Clarendon; magnetic pyrites w-ith galena, assaying 22 dwt. of 

 gold to the ton, though not showing gold; another instance of 

 this exceptional association. 



2498, Bongongolong ; one of those rare instances in which por- 

 phyry is the country-rock. The specimen, which has been cut to 

 show the structure better, consists of quartz-felspar-porphyry 

 traversed by veins of white quartz in w^hich gold is freely visible.. 

 It is worthy of particular attention. The occurrence of gold at 

 Cargo is similar. 



* Specimens such as this pro^•e that the ^old contents of a lode are subject to rearrange- 

 ment. In this case, in all probability, the jfold was originally contained in the pyriles, but 

 was subsequently dissolved out, and then re-deposited. 



fThe Department possesses a rich specimen from the Mother Sliipton Reef, Temora,. 

 containing 258 oz. of gold, and valued at more than £1,000. 



E 



