24 Mr. E. Matthey. 



Silver 8-1 



Lead 16-4 



Zinc 9-5 



Copper 4*0 



Iron 0-3 



Gold (by difference) .. 61-7 



100-0 



The cause of the differences revealed by assays made from metal 

 cut from various parts of the ingot was clearly due to liquation. ; 

 but previous experience failed to afford any guide to the probable 

 distribution of the precious and base metals in the ingot. 



C. Another instance, and on a mu.cn larger quantity of gold alloy 

 than the two former examples, was afforded by an ingot weighing 

 39*625 kilograms, which showed such great variation in its gold con- 

 tents at various points that the ingot was re-melted and cast into 

 two separate ingots, from which portions of metal were removed for 

 assay by drilling. 



by boring 709-0 



by boring ror-s 



All these results fare the averages of assays made in triplicate, 

 and a " dip " assay from the melted metal showed that it contained 

 701 parts of gold in 1000. 



The analysis of this metal gave 



Zinc ,. 7-1 



Lead 4'9 



Copper 4'8 



Iron 1'4 



Silver 9-2 



Gold (by difference). . 72'6 



100-0 



As in the former case, the gold and silver present were isolated 

 in mass, and the actual yield of fine gold and silver so obtained was 

 as follows : 



