284 MINING INDUSTEY. 



Notes accompanying the experiments upon the Kentuck ore. 



Nos. 1 to 20. Fifteen pounds of mercury added to the settler. 



Nos. 21 to 23. Ten pounds of mercury added to the settler. 



No. 3. No reason is known for the low yield both of gold and silver; the 

 amalgam looked well, and the fineness was very high. 



Nos. 8, 9, 10. These charges gave a higher gold return than any of the 

 assays of the ore. No sufficient explanation can be assigned for the fact. The 

 assays of the bullion were carefully repeated with the same results. Charge 

 No. 10 shows the greatest difierence between the assay and the yield, in which 

 case it is less than fourteen mills' worth of gold in excess of the amount as- 

 sumed from the assay to be present. This excess may probably be accounted 

 for by errors in the manipulation that the ore was subjected to during the 

 treatment in the pan and settler. It is possible that the mercury when 

 strained yielded a trifle more gold than usual. The fact is worthy of mention 

 that all the charges that show an excess of gold, with the exception of No. 

 20, follow each other consecutively. 



Nos. 17, 18. The sub-chloride of copper was added in a solution of salt. 

 The quantity of copper was equivalent to the amount contained in one ounce of 

 the sulphate of that metal. 



No. 23. The quantity of copper corresponded to two ounces of the sul- 

 phate of the metal. 



Notes accompanying the Experiments upon the Savage ore. 



Nos, 1 to 7. Fifteen pounds of mercury added to the settler. 



Nos. 8 to 12. Ten pounds of mercury added to the settler. 



No. 4. The pan by mistake ran six hours instead of five. 



No. 5. No cause could be assigned for the low return of bullion. 



Nos. 6, 7. The solution of sub-chloride of copper was the same as em- 

 ployed with Nos. 17 and 18 of the Kentuck ore. 



Nos. 11, 12. The solution of sub-chloride of copper was the same as 

 employed with No. 28 of the Kentuck ore. 



It m.ust be admitted that the results obtained in the above experiments 

 are not, in all respects, satisfactory, nor do they point out conclusively the ac- 

 tion and value of salt and sulphate of copper in the decomposition of the ar- 



