Value of Native Gold, ce. 223 
Some small pieces of Gold weighed before melting 11 Ibs. 
3 oz. 18 dwts., and after melting 10 Ibs. 8 oz. 14 dwts. 12 grs., 
showing a loss from the presence of extraneous matter of 
7 oz. 3dwts. 12 grs. On assay these were found to be equal 
to lllbs. 0oz. 7 dwts. 15 grs. of Standard Gold ; and the 
value of an ounce of metal is from this 80s. 1'04d., and its 
specific gravity 18319. 
Again, two lumps of Australian Gold weighed before 
melting 5 lbs. 4 oz. Odwts. 12 grs. After melting 4 lbs. 
9 oz. 16 dwts. 12 grs. 
The difference, 6 oz. 4 dwts., is the amount of extraneous 
matter. ‘The assay showed these specimens to be equal to 
4 lbs. 10 oz. 12dwts. 22 ers. of Standard Gold; and the 
value per ounce will therefore be 79s. 11°6d., and the 
specific gravity 18300. 
These latter results, agreeing as they do with each other, 
and with those deduced by experiment upon the Gold from 
Mount Alexander, establish beyond a doubt the relative’ 
value of the Australian Gold. It would be desirable of 
course to ascertain whether the Californian Gold, of which 
the assay has been given, was a fair average specimen ; but 
this can only be arrived at by more detailed experiments. 
The only two specimens which I have been able to procure 
gave specific gravities of 17272 and 17625 respectively ; 
the former probably containing some small amount of ex- 
traneous matter. We have no exact information as to 
the character of the extraneous matter in these specimens of 
Gold submitted to analysis, but if we assume it to be equal 
in gravity to quartz, we shall not be far wrong ; and the 
following comparison will be interesting :— 
The weight of all the specimens of Australian Gold was 
20 Ibs. 9 oz. 18 dwts. 12 grs.; the weight after melting 19 Ibs. 
1 oz. 6 dwts. 12 grs. The weight of extraneous matter 
