18 



GEOLOGIC GUIDEBOOK ALONG HIGHWAY 49 



[Bull. 141 



FIG. 1. Omega hydraulic mine ; the large water pipe supplied the "giants" or hose 

 nozzles. Photo by Olaf P. Jenkins. 



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FIG. 3. View southwest toward Blue Tent ditch, a typical carrier of water supplying 

 the hydraulic diggings. Photo by Olaf P. Jenkins. 



s 



FIG. 2. Depot Hill hydraulic mine near Camptonville. 



FIG. 4. View southwest toward placer mine half a mile east of Downieville 



