198 



SILVER-LEAD DEPOSITS OF EUREKA, NEVADA. 



Page. 



Minerals in Ruby Hill; pyrite 55 



; pyromorphite 58 



; quartz 58 



; silver 62 



; smitbsonite 56 



; steatite 58 



; talc 58 



; wad 59 



in the ore deposits of the Upper Mississippi .. 65 



' ' Mineral " limestone 13 



Mineral Point 167 



Mineral zone, Characteristics of the 113 



Mine workings in Adams Hill 166 



Missouri, Formation of ore in. 104 



, Lead deposits of 66 



Molyhdate of lead 54 



Molybdenite 55,58 



Molybdenum, Source of, in tbe ore - 55 



Mountain Boy claim 4 



Mountain mahogany as fuel 164 



Ophir District 65 



Ore, Age of the 105 



, Analysis of Richmond 60, 61 



(Arrangement of the, in the chambers 97 



channel of the east ore body 114 



channel of the west or« body 114 



connection . . 112 



deposition, Conditions of, in lower limestone 172 



,Deposition of, in the chambers 71,188 



, Distribution of, in Prospect Mountain 18,179 



t Evidences in, of pseudomorphism after limestone. 98 



.Extraction of, on tribute 150,151,152 



.Granite as a source of the 91 



, Importance of manner of deposition of 93 



in the lower workings of Ruby Hill 171 



in the Ruby Hill fault 172 



.Manner of deposition of the 93 



in which it entered the limestone 89 



, Possible sources of the 187 



, Quartz 60 



, Quartz-porpbyry as a source of the 90,187 



.Ratio of the, to the limestone 81 



, Red carbonate 59 



, Relation of caves to the formation of 99 



i In olite to tbe formation of 99 



, Rhyolite as a source of the 90 



.Richmond, chlorination test of 134 



, Segregation of, from tbe limestone 87 



, from the quartzite 88 



, from the shale 88 



, Shrinkage of the 101 



, Source of the, in Prospect Mountain 91 



, Strati u cation of, in the chambers 97, 98 



.Sulphuret 59,60 



.Yellow carbonate 59 



Ore bodies ; connected with fissurcsiu the Ruby-Dunder- 



burg 75 



, Connection of, with fissures and caves . 74, 75, 95 



of the Richmond claim 72 



, Relations of, tt> the formations 186 



, Size of, in Pru.speet Mountain 72 



, Stalactites in the 97 



, Timbering of the 153 



, Connection of, with the quartzite.... 72 



secondary fissure 72 



, Continuity of, in the Eureka 112 



Page. 



Ore bodies, Continuity of, in the Richmond 112 



, Contraction of 101 



, Effects of oxidation on 100 



, Electrical activity of 146, 147, 148 



.Formation of 185 



in connection with depressions in the quartzite. 78 

 fissures in the Williams 



mine 75 



in Prospect Mountain 72 



of the Buckeye and Champion 72 



Ore deposits, Age of the 69 



, Classification of, according to different au- 

 thors 118,184 



the Eureka €4 



, Comparison of richness of Prospect Moun- 

 tain, with Ruby Hill 170 



; depth to which they extend 174 



, Necessity of classification of 119 



of Adams Hill 166 



of C umbei land and Derbyshire 67 



of Eureka compared with others 64, 65, 66, 



67, 68, 69 



of Leadville, Description of 66, 67 



of Missouri 65 



of Prospect Mountain 169 



ofRaihl 102 



of the Great Basin 64 



of the Upper Mississippi 65 



of Upper Silesia 68 



of Westphalia 68 



, Relation of tbe limestone to the 70 



; Stocks 185 



, Theories in regard to the formation of 80 



, The shape of the 70 



Ores, Classification of 51 



, Composition of, in tbe Great Basin 65 



, Miners' classification of 59 



of Adams Hill 166,167 



of Prospect Mountain 63 



of Ruby Hill, Local differences in 52 



, Reduction of 158 



, Value of, in Raibl 69 



Oxidation, Influence of the water level upon 51 



of ores in the Great Basin 65 



Oxide of iron 55 



lead 58 



Page & Corwinmine - 4 



Palaeozoic rocks, Ore deposits in 65 



Pattinson process 162 



Phoenix Co., Organization of the 4 



mine, Main fissure in the. 29 



, Peculiar formation in the 9 



Phosphorus, Presence of, iu the ores 58 



Pietsch, on deposits of Upper Silesia — 68 



Plattner, on measurement of assay buttons 129 



Pogonip limestone 8 



Porphyry in Cumberland and Derbyshire 67 



Leadville 67 



Posepny, F., Conclusions of 103 



; on deposits of Raibl 68.102 



Pots, Crystallizing 162 



Potts chamber 73, 112, 114 



Preface x * 



Production of the District ■ 4 



Prospecting by assays, Use of the method of 14H, 149 



, Methods of 139 140, 141, 142, 191 



