80 



MINING INDUSTEY. 



Analyses of Co?}tstock Ores. 



Silica 



Protoxide of iron 



Alumina 



Protoxide of manganese 



Magnesia 



Lime 



Sulphide of zinc . 

 Sulphide of copper . 

 Sulphide of lead . 

 Sulphide of silver 



Gold 



Bisulphide of iron . . 

 Potassa and soda 

 Water 



Savage . 



83.95 

 1-95 

 1.25 



.64 

 2.82 



.85 

 1-75 



.30 



.36 

 1.08 



.02 

 1.80 

 1.28 

 2.33 



100.38 



W. G. Mixter. 



Kentuck. 



91.49 



.83 



I.I3 



1.37 

 1.42 



•13 

 .41 

 .02 

 .12 

 .0017 

 .92 

 1.05 

 •59 



99.48 



A. Hague. 



The following five analyses are from the report of R. H. Stretch, State 

 Mineralogist of Nevada. Although less completely carried out than the others, 

 they are interesting, since all the specimens were taken from levels which 

 represent middle depths. 



Table of Analyses of Comstock Ores. 





California Mine. 



California Mine. 



Ophir Mine. 



Yellow Jacket 

 Mine. 



Yellow Jacket 

 Mine. 



Silica . . . 



67.5 



65-783 



63.38 



98.310 



96.560 , 



Sulphur 







8.75 



"•35 



7.919 



.693 



.160 



Copper 







1.30 



I.3I 



1.596 







Iron . 







2.25 



2.28 



5.463 



.575 



2.800 



Silver , 







1-75 



1.76 



2.786 



.150 



.050 



Gold . 







• 059 



•57 



.059 



.005 



.001 



Zinc . 







12.85 



11.307 



14.455 







Lead . 







5-75 



6.145 



4.151 







Antimony- 









.087 







Loss . . 





•25 







.267 



.429 





100.00 



100.00 



99.896 



100.00 



100.00 









London. 



Swansea. 



G. Attwood. 



W. F. Rickard. 



W. F. Rickard. 



