INDEX. 



'75 



Scorification, 116 

 Serpentine, 13 



nature of, 100 

 Shaft, prospecting, 8 



where to sink a, 139 

 Shale, 14 

 Shales, 13 

 Sierra Nevada range, section of 



the, 14 

 Silicate of Alumina, 14 



of copper, 48 



of zinc, 83 

 Silicates in acid, gelatinization of 



certain, 31 

 Silurian rocks, 17 

 Silver, button of, 114 



tests for, 27, 29, 75 



wet assay for, 121 



ore, brittle, 75 



ores, 75 



glance, 76 



horn, 76 



native, 75 



ruby, 77 



ores, treatment of, 127 

 Sines, table of, Appendix 

 Sluicing for gold, 53 

 Soda, colour of flame caused by, 



3 1 



as a flux, treatment of carbon- 

 ate of, in 

 Sodium, to assist amalgamation, 



hyposulphite, 128 

 Spain, iron deposits in, 62 

 Spanish Peak deposits, 59 

 Specific gravity, to find the, 35 

 Specific gravities, table of, Appen- 

 dix 



Specular iron ore, 63 

 Stains in matrix, metallic, 7 



on cupel, 118 



Stratification of rocks, 15, 1 8 

 Streak, to find the, 32 

 Stream tin, 80 

 Strike, definition of the, 20 

 Sulphate of iron, to precipitate 



gold, 55 

 ult 



Sulphur, detection of, 31 

 Sunstone, 97 



Surface quartz, oxides with, 7, 55 

 Syenite, 13 

 Synclinal curve, 15 



TABLE Mountain, California, 



59 



Talc, hardness of, 36 



nature of, 103 



schist, 13 



Tasmania, tin ore in, 8l 

 Telluride, gold as a, 54 

 Tellurides, 33, 54, 58, 6l 

 Tertiary rocks, 16 

 Tetrahedrite, 46 

 Tetrahedron, 36 



Testing minerals by the blowpipe, 

 26 



by the wet process, 106 

 Tin ores: bellmetal, 81 



stream, 80 



tinstone, 80 



wood, 80 



dry assay for, 120 



tests for, 29, 30, 80 



stains on the cupel, 118 

 Titaniferous ore, 66 

 Tom, Broad & Long, 131 

 Ton, assay, 113 

 Topaz, 89, 91, 92, 96 



as a standard of hardness, 36 



characteristics of, 96 



oriental, 93 



Tourmaline, 93, 94, 97 

 Trachyte, 13 

 Trilobite, 17, 1 8 

 Trinidad, asphalte in, 85 

 Turquoise, 89, 96 



characteristics of, 96 

 Tuscany, borax in, 87 



UNCONFORMABLE stratifi- 



cation, 18 

 Ural Mountains, gold-bearing de.- 



posits in the, 54, 55 

 Uranium, 8 1 

 Uranium, tests for, 2$ 



