196 



SILVER-LEAD DEPOSITS OF EUREKA, NEVADA. 



Pago. | 



Chambers, Stratification of ore in 97,98 



Champion claim 3 



, Ore bodies of the 72 



Charcoal; how- burned 102 



Charge fur a furnace 161 



Chloro arsenate of lead 53 



Claudet, F. ; analysis of Richmond ore by 60 



; analysis of Richmond slag by 160 



; analysis of Richmond speiss by 160 



Clays 59 



Climatic changes affecting formation of caves 94 



Compromise line as a natural boundary 139 



, Description of the 23 



fault, Effect of the, on the two shale 



belts 38 



Comstock Lode H5 



Contact of limestone and shale 24 



Contact of quartzite and limestone 23 



Country rock, Assays of 82, 83, 84, 85, 133, 134, 135, 13G 



, Metals contained iu 81 



Crane used in Richmond works 162 



Cumberland, Ore deposits of 67 



Cupellation ; description of the process at the Richmond . 164 



, Loss by 126 



, Temperature used in 125 



Cupels, Preparation of 125 



Dana, J. D. ; on formation of aragonite 58 



Dead Broke mine, Ores of the 63 



Deposition of minerals, Relative time of the 80 



Derbyshire, Ore deposits of 67 



Devonian represented at Eureka 5 



Drifts, Cost of running 150 



, Timbering of 153, 154 



Earth currents in relation to prospecting 191 



East ore body, Connection of the, with fissures 75 



, Description of the 77 



in Richmond mine 73 



, Ore channel of the 114 



East vein on the Comstock * .-- 115 



Electrical activity of ore bodies in connection with assays. 142 

 Emmons, S. F.; description of Leadville deposits. .66, 67, 185 

 ; on necessity for the classification of ore 



deposits 119 



; on porphyry at Leadville 67 



Eruptive rocks, Description of 8, 9 



, Influence of 20,21 



Erzfiihrender Kalkstein in Raibl 68 



Eureka, Altitude of the town of 1 



Eureka District compared with Raibl 103 



.Description of 1,2,3,4, 175 



, Fires at 4 



, General geology of 5 



.History of 3 



, Massive rocks of 8, 9 



, Minerals in 52, 53, 54, 55, 56, 57, 58, 59, 184 



, Population of 4 



, Position of 1 



. , Production of 4 



.Sedimentary formations of 6, 7, 8 



, Topography of 1 



Eureka mine; law suit with the Richmond Ill 



, Main fissure in the 30 



, Method of prospecting in the 139,140 



, Method of timbering in the 156 



, Order of the formations in tho 26 



, Organization of the 3 



Eureka mine, Tribute system in the 151 



Tunnel, Formations in the 178 



,Ores of the 63 



Experiments, Electrical 142 



Experiments on loss by cupellation 126, 127, 128 



Fault, The Jackson : 21,184 



, The main 24 



Faulting in Prospect Mountain 170 



, Manner of, near Compromise line 39 



movements in Adams Bill 165 



Faults iu tho Eureka Tunnel 178 



in the quartzite 44,45,47 



in Ruby Hill 20,26 



, Manner of occurrence of 72 



Field, Justice, Decision of 113 



; tries Richmond and Eureka suit Ill 



Fissure in Banner mine 73 



in the Ruby -Dunderburg 73 



, The main 24, 25 



. Rbyolite filling of 25 



Fissure, The secondary, between quartzite and lime- 

 stone 112,182 



Fissures as indications of ore 139 



between the 7th and 9th levels of the Richmond 96 

 , Connection of, with ore bodies and caves 74,75,95,186 



iu Adams Hill 166 



in Cumberland and Derbyshire 73 



in Prospect Mountain 16 



, Junction of the two principal 114 



, Manner of occurrence of 73 



Flux, Composition of 124 



Formations of Adams Hill ' 165 



ofEureka District 5,6,7,8,9,10, 175 



, Relations of, to ore bodies 186 



Front limestone, Barrenness of, accounted for 41 



, Characteristics of 42 



, Description of 41 



in the Eureka 41 



in the K. K 42 



Fuel for smelting 162 



Furnaces, Description of the Richmond 159 



Future of Euieka, The probable 171 



of Prospect Mountain 192 



of Ruby Hill 192 



Galena in Cumberland and Derbyshire, Value of 68 



in the Eureka ores... 52 



Gang, Definition of 118 



Geddes & Bertrand mine 4 



Gold as a reagent.... 137 



, Decrease of amount in the Ruby Hill ore 170 



, Estimation of 120,131 



in the different rocks 187 



in the ores of Adams Hill 167 



, Ratio of, to silver in Richmond lead 163 



Granite as a source of the ore 91 



, Assay value of 134 



inRubyHill 19 



, Occurrences of 8 



Great Basin, Occurrence of fissure veins in 70 



Grimm, J. ; on classification of ore deposits 118 



Hague, Arnold ; description of formations. 165,176 



; determination of formations by 113 



, Direction of Jackson fault according 



to 50 



, Thickness of the formations according 



