640 



INDEX. 



Page. 



Oreana, Nevada 297 



Oregon miue 358 



Ore-bodies, arrangement of iu Corn- 

 stock lode 51, 7G, 77, 78 



Ore-bodies of Gold Hill group 41 



Yirginia group 52 



Opbir-Mexican group 63 



Savage mine 58 



Hale and Norcross.. 54 

 , Gould and Curry. . . 59, 60 



character of quartz 110 



assortment of ore in 



stoping 110 



Ore-bodies of Lander Hill veins. . . 354 



Ore extraction in Comstock 116 



Ores, cost and yield of 147 



low-grade, of Comstock lode. 163 

 metallurgical treatment of at 



Washoe 193 



classification of for treatment 193 



sami)ling of for milling 238 



first-class of Comstock, treat- 

 ment of 264 



of Lander Hill veins 351 



Ores at Eeese Eiver, yield of 381 



White Pine, modes of occur- 

 rence 418 



first-class in Colorado, yield of 539 

 price paid 



for.... 584 

 assay val- 

 ue of.. 585 

 treatment 



of 577 



proportion of first-class to sec- 

 ond class in Colorado 536 



yield of in Colorado 558, 559 



yield of in Colorado, Gardner 



lode 530 



Page. 



Ores, yield of iu Colorado, Illinois 



lode 525 



yield of in Colorado, Califor- 

 nia lode 543 



yield of in Colorado, Ophir 



mine 533,535 



yield of in Colorado, Winne- 

 bago lode 545 



yield per fathom in Colorado . 536 

 occurrence of in Gregory lode 508 

 occurrence of in Brown lode . 696 

 of Colorado gold veins, treat- 

 ment of 547 



silver-bearing, of Georgetown, 



value of 594, 612 



occurrence of in Terrible lode 593 



product of. Equator mine 602 



values and yield of at George- 

 town 608,610 



concentration of about George- 

 town 613 



silver-bearing, treatment of at 



Georgetown 606 



silver-bearing, price paid for. 615 



Orthoccras 415 



Ostrea 459, 462 



Overman mine, on Comstock 43, 99 



operations of 186 



Owyhee district 7 



Pacific Coast Eanges, metalliferous 



deposits 5 



Pans, for grinding and amalgama- 

 tion 197, 217 



Pans, various forms of bottom 218 



Fountain's 219,226 



Greeley's 220 



Hepburn's .■- . . 218, 222 



Horn's. 219 



