[131] The weight of the ore less the weight of ruby silver in it.
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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London & Edinburgh.