u. s. GEOLOGICAL SURVEY 



PROFESSIONAL PAPER NO. 42 Pl~ XX 



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Scale for sections (A)-(B) 





CROSS SECTIONS, SHOWING STRUCTURE OF MIZPAH VEINS. 



A. Sketch of Mizpah vein, vertical cross section, 300-foot level, west drift. 



R. Cross section of portion of Mizpah vein in Tuscarora stopes, about 90 feet from the surface. 

 C. Vertical cross section of portion of Mizpali vein, 300-foot level, west drift. 200 feet west of shaft. 

 />. Mizpah vein, 300-foot level, east drift, near main crosscut. 

 E. Sketch of vein in crosscut south from east drift, 300 foot level, Mizpah mine. 



I rock, decomposed andesite; 6 = highly fractured, decomposed, and silicified andesite; c~ granular, gray, aluminous quartz (ordinary variety of these 

 veins); d clear quartz, filling cavities, often with corrb structure. 



