OCCURRENCE OF GOLD IN THE HAWKESBURY ROCKS. 



187 



The above is a solitary experiment and much importance cannot 

 be attached to it — for if over two grains of gold were always 

 retained by every five pounds of sandstone or its equivalent of 

 mineral matter, the chlorine process would be useless. 







By Fusion. 



By KCN Solution. 



No. 



1 Building Stone 



none 



not treated. 



No. 



2 



none 



not treated. 



No. 



3 



not assayed 



35 '84 grains per ton» 



No. 



4 „ 



trace 



8-96 



No. 



5 Pyrmont Stone 



14 grains per ton 



12-32 



No. 



6 



none 



2-24 



No. 



7 „ „ reddish 



none 



not treated. 



No. 



8 „ 



7 grains per ton ... 



not treated. 



No. 



9 „ 



18 „ 



not treated. 



No. 



10 „ soft and micaceous 



none 



2'24 grains per ton. 



The fusion assays of Nos. 5, 6, 8 and 9 were made for me by 

 Mr. Nardin, b.e., a student in the Mining School of the University. 



Nos. 1 to 4 were ordinary sandstones, suitable for rough work ; 

 Nos. 5, 6, 8, and 9 were of a better quality and more compact ; 

 No. 7 was a soft red friable stone of little value for building ; 

 No. 10 was of poor quality, soft, friable and micaceous with a 

 good deal of kaolin. 



None of the above contain sufficient gold to pay for extraction 

 but the two following are much richer ; the first was a very 

 ferruginous red sandstone expressly selected because it might 

 prove to be richer, and this was found to be the case, for two 

 closely agreeing assays yielded 9 dwts. 19 grains of gold per ton, 

 it would therefore be worth about £2 per ton. The second 

 specimen, a pebbly sandstone, gave 3 dwts. 6 grains per ton, and 

 this would be worth about thirteen and nine pence a ton. 



Waianamatta Shale from the University grounds. So as to be 

 quite certain that the material had not come in contact with 

 photographic or other refuse likely to contain gold, this was taken 

 at a depth of two feet from the trenches as they were being put 

 down for the foundation of the Engineering Laboratory buildings. 



The light coloured shale examined, did not yield any gold ; but 

 the deep red shale yielded 2 dwts. 23*8 grains to the ton, worth 



