216 



GEOLOGY OF TONOPAH MINING DISTRICT, NEVADA. 



8. Ore matei'ial (152) of Mizpah vein, 300-foot level, west drift. Shows in the 

 hand specimen dense quartz, intermixed irregularly with apparently kaolinic 

 material. 



The microscope shows tine to moderately coarse granular and retiform quartz, 

 with much fine muscovite. The quartz contains inclusions. Intermixed with the 

 quartz in the finer-grained areas is adularia in characteristic rhombic-sectioned 

 crystals. 



ANALYSES OF DESCRIBED TYPES. 



Following are the analyses of these rocks by Mr. George Steiger: 

 Analyses of different phases of altered earlier andesite. 



1. Lower part of Siebert shaft. 



2. Tonopah and California shaft. 



3. Fraction No. 2 shaft. 



4. Near Mizpah Hill. 



5. Near Mizpah vein. 



6. Mizpah Hill. 



7. Wall of Mizpah vein. 



8. Mizpah vein. 



a Not looked for. 



