Charcoal, To make, 141 Chemical formulas, 182 Chlorine as a lixiviator, 73-75 Company formation, 113-126 Comstock lode, 42, 43 Copper mine at Burra Burra, 24 Copper plates, Scaling, 144, 145; Silvering, 149; Dressing, 151 Correspondence, How to make copies of, 137 Cube roots, 191 Cubes, 191 Cyanide of potassium, Use of, in extracting gold, 95, 96 D Daintree, on deposition of gold from chloride, 51 Diamond drilling, 173 Directors of companies, 114 _et seq._ Dodge stone-breakers, 69, 70 Dolly, 152 Drift, Origin of gold in, 49 Dry blowing, 18 Dugout, 128 Duncan pan, 91 E Electricity as a motive power and transmitter, 111, 112 Electrolytic process of extracting gold, 96-99 Elements, Table of, 181, 182 Eurieowie, Tin at, 32 F Filter, 135, 136 Fire, Mode of producing, 137 Fire-lute, 166 Flooded Stream, How to cross a, 138 Flumes, 63 Forge, Temporary, 140 Freezing-points, 184 Frue vanner, 89, 90 Fuels, Heat values of, 184 Furnaces used in calcining, 101 _et seq._ Fusing points, 184 G Gold, Value of, 1; Early notices of, 1, 2; Origin and sources of, 2-7; Modes of occurrence, 10, 11; Prospecting for, 13 _et seq._; Signs of, 26; Assaying, by amalgamation, 30; associated with tin ores, 32, 33; Relation of, to volcanic action, 36; its probable mode of occurrence in early geological times, 38, 39; Mode of deposition in quartz, 39, 55, 57; Formation of sulphides of, 39, 40; Precipitation of, in pyrites, 41, 42, 51-54; Solution of, by mine water, 42; Opinion as to growth of, in drift deposits 48; Daintree on its deposition from chloride, 51; Wilkinson on its precipitation on iron pyrites, 51, 52 Gold (Alluvial) Origin of, 17, 49, 50, 51; Prospecting for, 17 Gold extraction, 11, 12, 59 _et seq._; necessity of scientific procedure, 60; German organisation, 60; early methods, 61; modern methods, 61 _et seq._; hydraulicing, 62, 65; mills and crushers, 66-72; power and water for batteries, 73, 74; ore feeders, 74, 75; stamp mills, 76-78; screens, 78; blanket tables, 79; treatment of pyritous ores, 80; mode of saving the gold, 81; treatment of ferruginous ores, 82; cleaning and scaling plates, 83; retorting amalgam, 84-86; percussion tables, 88; Frue vanner, 89, 90; pan concentrators, 90; amalgamators, 91-93; lixiviation, 93 _et seq._; calcination, 100 _et seq._; how to avoid loss in cleaning up, 148 Gold-field, Mount Brown 17, 18 Griffin Mill, 67, 69 Grusonwerk ball mill, 71 Gutters, 20 H Hammock, 130, 132 Heated bearings, Cooling compound for, 163 Heat values of fuels, 184 Horse-power of engines, 144, amount required for pumping water, 172 Horse-shoe furnace, 103 Howell-White furnace, 104, 105 Huntingdon mill, 69