Part 2 — INDEX.

Acid measures, 49 Acidimetry, 323 Acidity of ores, 168 Acids, 54 strength of, 54, 75, 436 Air of mines, carbonic acid in, 428 Alkalies, 330 determination of, 331 Lawrence Smith's method for, 333, 412 separation of, 332 Alkalimetry, 323 Alkaline earths, 320 Alumina, 314 determination of, 315 in mineral phosphates, 316 separation of, 314, 316 Amalgamation, 126 Ammonia, detection of, 341 determination of, 342 in natural waters, 353 Antimony, 225 detection of, 227 dry assay for, 226 gravimetric assay, 228 separation of, 228 volumetric assay, 229 Arsenic, 381 detection of, 381 dry assay for, 382 gravimetric assay, 383 in brimstone, 393 in crude arsenic, 388, 393 in mispickel, 125, 392 iodine, assay for, 386 separation by distilling, 384 uranium acetate, assay for, 389 Volhard's method applied to, 124 Assay book, 11 note, 12 results, 7 tons, 13, 131 Assaying, 1 methods, 15 Assays, check, 154 preliminary, 147 Atomic weights, 69 table of, 433 Barium, 326 Baryta, 326 Barytes, sulphur in, 378 Base bullion, sampling of, 157 Basic acetate separation, 233 Baumé's hydrometer, 77 Beryllia, 319 Bismuth, 220 colorimetric assay, 223 detection of, 221 gravimetric determination of, 222 in commercial copper, 208 separation of, 222 Black tin, 271 an analysis of, 287 assay of, 276 copper in, 204 examination of, 285 separation by vanning, 272 Blank assays, 34 Blende, sulphur in, 375 zinc in, 266 Book, assay, 11 laboratory, 10 sample, 9 Boracic acid. See Boron Borax, examination of, 431 Boron, 429 direct determination of, 431 Brass, copper in, 194 zinc in, 265 Bromine and bromides, 361 Bronze, copper in, 194 tin in, 281 Burettes, 51 Burnt ore, silver in, 116, 118 sulphur in, 377 Cadmium, 269 gravimetric determination, 269 separation of, 269 Caesium, 339 Calcination, 22, 92, 139, 345 Calcium, 320 detection of, 321 gravimetric determination, 321 separation of, 321 titration with normal acid, 322 titration with permanganate, 322 Calculation of results, 7 Calculations from formulæ, 70 Calorific effect of coal, 419 Calorimeter, 419 Calx, 345 Carbon, 414 gravimetric determination, 416 in iron or steel, 423 Carbonates, 424 Carbonic acid in the air of mines, 428 Caustic potash = potassium hydroxide, 65 Caustic soda = sodium hydroxide, 66 Cerium, 318 Chalybite, iron in, 243 Charcoal, 21, 94 Check assays for gold, 154 for silver, 104, 113 Chlorine and chlorides, 359 Chromium, 307 gravimetric assay, 309 in chrome iron ore, 308 volumetric assay, 309 Clays, examination of, 316 Coals, 418 Cobalt, 259 detection of, 259 dry assay for, 251 gravimetric determination, 260 in hardhead, 288 separation from nickel, 442, 254, 258 Coke, 25 Common salt, examination of, 336 Concentrates, assay for gold of, 140 Colorimetric assays, 44 Copper, 175 Copper, bismuth in, 208 colorimetric assay for, 190, 203 commercial, arsenic in, 208, 388 commercial, copper in, 193 commercial, examination of, 205 cyanide assay for, 194 dry assay of, 176 dry assay, loss of, in, 176 electrolytic assay for, 190, 203 gold in, 206 iodide assay for, 199 iron in, 209, 249 lead in, 206 separation of, 183 silver in, 205 sulphur in, 207 Copper ores, solution of, 183 valuation of, 181 Copper pyrites, copper in, 179, 188, 198, 202 sulphur in, 376 Culm, 22 Cupel, 23, 142 Cupellation, loss, corrections for, 103 loss in gold, 145 loss in silver, 101 of gold lead alloys, 182 of silver lead alloys, 98, 110 temperature of, 143 Cyanicides, 169 Cyanide assay for copper, 194 for nickel, 255 for tin, 278 Cyanides, alkalinity of, 167 assay of, 167 commercial, 160 double, 161 gold-dissolving power, 162 prussic acid, 162 volumetric determination of, 163, 165 Cyanide liquors, alkalinity of, 167 assay of, 164, 165 assay of, for gold, 140 assay of, for zinc, &c., 169 Daniell cells, 185 Didymium, 319 Dollars to the ton, 9 Dry assays, 16 Drying, 5, 33 Earths, 314 the alkaline, 320 Electrodes, 187 Electrolysis for copper, 184 for nickel, 254 Equations, 69 Erbia, 319 Ferrous and ferric salts, 231 Filtration, 31 Finishing point, 42 Flasks, graduated, 49 Flatting, 149 Fluorine and fluorides, 363 Fluxes, 16, 93, 136, 138, 140 Formulæ, 68 Furnaces, 25 Galena, lead in, 217, 218 Gangue, 405 iron in the, 244 Gas-measuring apparatus, 52 Gases, measurement of, 44 Gay-Lussac's assay for silver, 119 assay for silver modified, 123 German silver, copper in, 194 nickel in, 255, 259 Gold, 126 amalgamation of, 126 in cyanide liquor, 140 loss of, in cupellation, 145 loss of, in parting, 154 preparation of, 63 silver in, 157 silver in, after parting, 154 test for, 126 Gold-lead alloys, cupellation of, 142 sampling of, 158 Gold ores assay with cyanide solutions, 141 calcination of, 139 concentrates, 140 fluxing, 136, 138, 140 sampling of, 127 size of assay charges, 127 tailings, 140 Gold-parting, 150 platinum in, 145, 154, 170, 171 Gold-zinc slimes, 142 Graduated vessels, 49 Gravimetric methods, 15, 27 Halogens, 358 Hardhead, 287 an analysis of, 289 Hot plate, 30 Hydrogen, preparation of, 62 reduction by, 280 Hydrometer, 77 Ignition, 32 in hydrogen, 280 Indicators, 42 Inquartation, 146 Iodine and iodides, 362 Iridium, 171 Iron, 231 bichromate assay for, 237, 243, carbon in, 423 colorimetric assay for, 247 ferrous and ferric, 231 gravimetric determination, 233 permanganate assay for, 236, 238 phosphorus in, 399 reduction of ferric solutions, 235, 241 separation of, 232 stannous chloride assay for, 244 volumetric assays for, 234 Iron ores, iron in, 244, 247 phosphates in, 399 Laboratory books, 9 Lanthanum, 319 Lawrence Smith's method for alkalies, 333, 412 Lead, 211 colorimetric assay for, 218 detection of, 211 dry assay for, 211 gravimetric determination of, 213 in commercial copper, 206 in commercial zinc, 214 in galena, 217, 218 separation of, 211, 213 volumetric determination of, 214 Litharge, use of, in dry assays, 20, 93 Lithium, 338 Lime, 320 milk of, 321 volumetric assays for, 322 Limestone, examination of, 329 lime in, 324 Limewater, 321 Loths, 9 Magnesia, magnesium, 328 mixture, preparation of, 64 Manganese, 298 colorimetric assay, 306 detection of, 299 gravimetric determination of, 300 separation of, 299 volumetric determination of, 300 Manganese peroxide, ferrous sulphate assay for, 301 iodine assay for, 302 = manganese dioxide, 298 Manganese ore, copper in, 204 manganese in, 300 peroxide in, 302 Matte, 18 Measuring, 49 flasks, 49 gases, 44, 52 gold buttons, 133, 440, liquids, 49 silver buttons, 106 Mechanical methods, 16 Mercury, 171 dry assay, 172 wet assay, 173 Metallic particles in ores, gold, 129 particles in ores, silver, 108 particles, tin, 278, 287 Micrometer, 133 Microscope, measuring with the, 440, 133 Mispickel, arsenic in, 125, 392 sulphur in, 376 Moisture, 7, 350 Molybdate separation for phosphates, 395 solution, preparation of, 60 Molybdenum, 311 Muffle, 25 Nessler's solution, 342 Nickel, 251 dry assay for, 251 electrolytic assay, 254 gravimetric determination of, 254 in German silver, 255, 259 separation from cobalt, 254, 258, 442 separation from iron, 258 separation from manganese, 258 separation of, 253 volumetric assay, 255 Niobium, 297 Nitre, 22 use of, in dry assays, 95 Nitrogen and nitrates, 400 Nitrometer, 403 Normal acid, normal solutions, 323 Ores, determining water in, 5, 351 drying, 5 powdering, 4, 109, 130, 448 quantities of, for an assay, 11, 27, 127 sampling, 1, 127, 444 with metallic particles, 3, 108, 129 Osmiridium, 171 Osmium, 171 Ounces to the ton, long, 107 to the ton, short, 132 Oxidation, 345 Oxides, 345 determination of oxygen in, 346 Oxidising agents, 22, 95, 345 effect of nitre, 95 effect of nitric acid, 56 Oxygen, 344 equivalent, 358 in natural waters, 344, 356 in ores, 348 Palladium, 171 Parting, 150 acids, 150 in flasks, 151 in glazed crucibles, 153 in special apparatus, 156 in test tubes, 152 Phosphate, assay of apatite for, 399 assay of iron ore for, 399 Phosphates, gravimetric assay, 396 volumetric assay, 397 Phosphorus and phosphates, 394 in iron, 399 Pipette, 50, 120 Platinum, 170 in gold, 145, 154, 170 Potash, commercial examination of, 338 Potassium, 336 gravimetric determination, 337 Potassium cyanide, 22, 65, 160 commercial assay of, 167 commercial, purity of, 161 Powdering, 4, 130, 448, 109 Precipitation, 30 Precipitates, drying, 32 igniting, 32, 34 washing, 31 Preliminary assays, 104, 147 Preparation of acids, 54 of other reagents, 59 Prill, 108, 129, 278, 287 Produce, 8 Pyrarsenate of magnesia, 383 Pyrites, iron in, 244 sulphur in, 370, 376 Pyrophosphate of magnesia, 397 Quantity to be taken for an assay, 11, 27, 127 Quartation, 146 Quartering, 2 Reagents, strength of, 54 Red lead for dry assays, 20, 22, 94 Reducing agents, 21, 94 effects of charcoal, &c., 94 effect of mineral sulphides, 95, 97, 98 Reduction by hydrogen, 280 of ferric solutions, 235, 242, 244 Regulus, 18 Report form, 12 Results, calculation of, 7, 13, 16, 38, 107, 131, 132 statement of, 7 Rhodium, 171 Roasting, 22, 345 Rolling, 149 Rubidium, 340 Ruthenium, 171 Sample book, 9 Sampling, 1 effect of powdering on, 449 errors, 447 gold ores, 127 metals, 157 theory of, 444 Scorification of silver ores, 88 Scorifier, 23, 89 Selenium, 379 Separation, as sulphides, 57 basic acetate, 233 molybdate, 395 Shales, bituminous, 420 Silicon and silicates, 405 in iron, 414 Silica in rocks, 409 in slags, 414 Silicates, alkalies in, 333, 412 beryllia in, 320 examination of, 409 titanium in, 411 Silver, 87 correction for cupellation loss, 103 detection of, 87 Gay-Lussac's assay, 119 Gay-Lussac's assay modified, 123 gravimetric determination of, 117 in bullion, 113 in burnt ore, 116, 118 in copper, 114, 205 in galena, 114 in lead, 113 in oxide of lead, 113 in silver precipitate, 115 loss in cupellation, 101 pure preparation of, 66 Volhard's assay, 121 volumetric methods, 119, 121, 123 Silver lead alloys, cupellation of, 98 sampling of, 157 Silver ore, crucible assay of, 90 metallic particles in, 108 scorification of, 88 Size of assay charges, 11, 27, 127 Slags, 19 Soda-lime, 425 Sodium, 334 Sodium cyanide, 160 Solution, 29 Solutions, normal, 323 standard, 36 Specific gravity, 75, 436 Speise, 19 Standard, 37 solutions, 36 Standardising, 37 Steel, carbon in, 423 chromium in, 310 manganese in, 300 Stoking, 25, 143 Strength of reagents, 54 Strontium, 324 Sulphates and sulphur, 367 gravimetric determination, 369 volumetric determination, 370 Sulphides, reducing action of, 9, 95 Sulphocyanate assay for silver, 121 Sulphur in blende, 375 in burnt ore, 377 in chalcocite, 376 in coal, 419 in copper, 207 in copper pyrites, 376 in mispickel, 376 in pyrites, 370, 376 Sulphuretted hydrogen, preparation, 57 Surcharge, 154 System in assaying, 28 Table, atomic weights, 433 comparing thermometers, 435 ounces to the long ton, 107 ounces to the short ton, 132 sp. g. ammonia, 438 sp. g. hydrochloric acid, 437 sp. g. minerals, 86 sp. g. nitric acid, 436 sp. g. sulphuric acid, 439 sp. g. water, 83 Tantalum, 297 Tartar, 20, 94 Tellurium, 379 improved test for, 150 Thallium, 219 Thorium, 317 Tin, 271 See also Black tin assay for, by vanning, 273 copper in, 204 Cornish assay, 276 cyanide assay, 278 detection of, 279 gravimetric determination of, 281 iron in, 250 separation of, 280 volumetric assay for, 282 Tin arsenide, 284 Tin phosphide, 284 Tin slag, 290 an analysis of, 292 tin in, 290 Titanium, 292 detection of, 293 in black tin, 272, 287 in rocks, 411 separation, &c., 294 Titration, 35 indirect, 43, 72 Ton, assay, 13, 131, long, 2240 lbs. = 32,666.6 oz., 107 short, 2000 lbs = 29,166.6 oz., 132 Tungsten, 295 Tungstic acid, 295 gravimetric determination, 296 in black tin, 285 in wolfram, 296 Uranium, 312 Valuation, of copper ores, 181 Vanadium, 310 Vanning, 273 Volhard's assay applied to arsenic, 124 silver assay, 121 Volume-corrector, 53 Volumetric assay, 35, 38 Water, 7, 350 direct determination of, 351 examination of, 352 expansion of, 83 solids in, 354 Weighing, 47 small gold buttons, 131 Weights, 47 Wolfram, an analysis of, 296 tungstic acid in, 296 Yttria, 319 Zinc, 261 commercial, examination of, 268 commercial, iron in, 249 commercial, lead in, 214 dry assay, 261 gasometric assay, 266 gravimetric determination, 262 in blende, 266 in cyanide liquors, 169 in silver precipitate, 266 separation of, 262 volumetric assay, 263 Zirconia, 317

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