44 



GEOLOGIC GUIDEBOOK ALONG HIGHWAY 49 



[Bull. 141 



FIG. 6. Looking northeast toward mine buildings of Sixteen-to-One mine at 

 Allegheny. Photo ly C. V. Averill. 



FIG. 8. Drill cores of serpentine taken during the sinking of the 1000-foot Idaho No. 2 

 shaft of the Idaho-Maryland mine at Grass Valley. Photo by W. 0. Jenkins. 



FlO. 7. Doodlebug dredge in operation near the Calaveras Cement Company plant 

 south of San Andreas. Photo by Olaf P. Jenkins. 



FIG. 9. Abandoned wheels at Jackson Gate which were once used trflift tailings 

 from the Kennedy mine over the hill to a tailings disposal area. These are 68 feet in 

 diameter and were equipped with 176 buckets each. 



