50 



HATCH : THE KOLAR GOLD-FIELD. 



gold recovered by amalgamation averaged 29*3 dwts. of fine gold per 

 ton. Consequently of the total amount of gold won from mill and 

 cyanide works, that recovered by amalgamation amounted to 94 per 

 cent. The ore sent to the mill is estimated by the management to 

 have had an assay value on the average of 33*8 dwts. of fine gold to 

 the ton. On this estimate, therefore, the extraction by amalgamation 

 amounted to 86'6 and the total extraction to 91*7 per cent., of the 

 total value of the ore. It would be profitless to make calculations on 

 the relative proportion obtained by amalgamation and cyaniding as the 

 company is still engaged in treating old accumulations of tailings. 



The cost of milling in three of the leading mines, as shown by the 

 published accounts of the companies, was during 1899 as follows : — 



Name of Mine. 



Mill costs. 



Wheeler pan 

 costs. 



Total amal- 

 gamation 

 costs. 



Mysore ...... 



Champion Reef. .... 



Nundydroog ..... 



5. d. 



5 r6 



6 7-9 



5 9"5 



s. d. 

 nil. 



2 IO"I 



105 ' 



5. d. 



5 i'6 

 6 



6 8 



The disadvantages of conducting milling operations in a number 

 of small mills with light stamps is apparent in the high working cost of 

 the Champion Reef. There is no doubt that, when the new mill starts 

 work there, and Wheeler pans are discarded, these costs will be brought 

 down to a level with, if not lower than, those obtaining in the Mysore 

 mill. The follow ing tabulated statement gives some details of the ex- 

 penditure on milling for the Mysore and Nundydroog companies: — 



Heads of expenditure. 



Mysore. 



Nundydroog. 















Per 



ton. 



Per cent. 



Per ton. 



Per cent. 





5. 



d. 





s. d. 





European labour . . 







7\S 



121 



O 7'2 



IO'4 



Native labour .... 







ii-4 



l8'4 



I 04 



17-8 



Fuel 



2 



2-3 



426 



3 5'3 



59 4 



Shoes and dies .... 



O 



4"9 



80 



3'4 



49 



Ouicksilver • . . + 



O 



16 



2-6 



0-5 



07 



Oils and tallow .... 



O 



09 



i-5 



07 



vo 



Timber ..... 







0!) 



1-5 



... 



... 



General stores .... 



O 



8-2 



I3'3 



4*o 



5'8 





5 



17 1000 



5 0'5 



1000 



1 Only 800 tons were treated in Wheeler pans and that only for six months. 



