Acid measures,49Acidimetry,323Acidity of ores,168Acids,54strength of,54,75,436Air of mines, carbonic acid in,428Alkalies,330determination of,331Lawrence Smith's method for,333,412separation of,332Alkalimetry,323Alkaline earths,320Alumina,314determination of,315in mineral phosphates,316separation of,314,316Amalgamation,126Ammonia, detection of,341determination of,342in natural waters,353Antimony,225detection of,227dry assay for,226gravimetric assay,228separation of,228volumetric assay,229Arsenic,381detection of,381dry assay for,382gravimetric assay,383in brimstone,393in crude arsenic,388,393in mispickel,125,392iodine, assay for,386separation by distilling,384uranium acetate, assay for,389Volhard's method applied to,124Assay book,11note,12results,7tons,13,131Assaying,1methods,15Assays, check,154preliminary,147Atomic weights,69table of,433Barium,326Baryta,326Barytes, sulphur in,378Base bullion, sampling of,157Basic acetate separation,233Baumé's hydrometer,77Beryllia,319Bismuth,220colorimetric assay,223detection of,221gravimetric determination of,222in commercial copper,208separation of,222Black tin,271an analysis of,287assay of,276copper in,204examination of,285separation by vanning,272Blank assays,34Blende, sulphur in,375zinc in,266Book, assay,11laboratory,10sample,9Boracic acid.See BoronBorax, examination of,431Boron,429direct determination of,431Brass, copper in,194zinc in,265Bromine and bromides,361Bronze, copper in,194tin in,281Burettes,51Burnt ore, silver in,116,118sulphur in,377Cadmium,269gravimetric determination,269separation of,269Caesium,339Calcination,22,92,139,345Calcium,320detection of,321gravimetric determination,321separation of,321titration with normal acid,322titration with permanganate,322Calculation of results,7Calculations from formulæ,70Calorific effect of coal,419Calorimeter,419Calx,345Carbon,414gravimetric determination,416in iron or steel,423Carbonates,424Carbonic acid in the air of mines,428Caustic potash = potassium hydroxide,65Caustic soda = sodium hydroxide,66Cerium,318Chalybite, iron in,243Charcoal,21,94Check assays for gold,154for silver,104,113Chlorine and chlorides,359Chromium,307gravimetric assay,309in chrome iron ore,308volumetric assay,309Clays, examination of,316Coals,418Cobalt,259detection of,259dry assay for,251gravimetric determination,260in hardhead,288separation from nickel,442,254,258Coke,25Common salt, examination of,336Concentrates, assay for gold of,140Colorimetric assays,44Copper,175Copper, bismuth in,208colorimetric assay for,190,203commercial, arsenic in,208,388commercial, copper in,193commercial, examination of,205cyanide assay for,194dry assay of,176dry assay, loss of, in,176electrolytic assay for,190,203gold in,206iodide assay for,199iron in,209,249lead in,206separation of,183silver in,205sulphur in,207Copper ores, solution of,183valuation of,181Copper pyrites, copper in,179,188,198,202sulphur in,376Culm,22Cupel,23,142Cupellation, loss, corrections for,103loss in gold,145loss in silver,101of gold lead alloys,182of silver lead alloys,98,110temperature of,143Cyanicides,169Cyanide assay for copper,194for nickel,255for tin,278Cyanides, alkalinity of,167assay of,167commercial,160double,161gold-dissolving power,162prussic acid,162volumetric determination of,163,165Cyanide liquors, alkalinity of,167assay of,164,165assay of, for gold,140assay of, for zinc, &c.,169Daniell cells,185Didymium,319Dollars to the ton,9Dry assays,16Drying,5,33Earths,314the alkaline,320Electrodes,187Electrolysis for copper,184for nickel,254Equations,69Erbia,319Ferrous and ferric salts,231Filtration,31Finishing point,42Flasks, graduated,49Flatting,149Fluorine and fluorides,363Fluxes,16,93,136,138,140Formulæ,68Furnaces,25Galena, lead in,217,218Gangue,405iron in the,244Gas-measuring apparatus,52Gases, measurement of,44Gay-Lussac's assay for silver,119assay for silver modified,123German silver, copper in,194nickel in,255,259Gold,126amalgamation of,126in cyanide liquor,140loss of, in cupellation,145loss of, in parting,154preparation of,63silver in,157silver in, after parting,154test for,126Gold-lead alloys, cupellation of,142sampling of,158Gold ores assay with cyanide solutions,141calcination of,139concentrates,140fluxing,136,138,140sampling of,127size of assay charges,127tailings,140Gold-parting,150platinum in,145,154,170,171Gold-zinc slimes,142Graduated vessels,49Gravimetric methods,15,27Halogens,358Hardhead,287an analysis of,289Hot plate,30Hydrogen, preparation of,62reduction by,280Hydrometer,77Ignition,32in hydrogen,280Indicators,42Inquartation,146Iodine and iodides,362Iridium,171Iron,231bichromate assay for,237,243,carbon in,423colorimetric assay for,247ferrous and ferric,231gravimetric determination,233permanganate assay for,236,238phosphorus in,399reduction of ferric solutions,235,241separation of,232stannous chloride assay for,244volumetric assays for,234Iron ores, iron in,244,247phosphates in,399Laboratory books,9Lanthanum,319Lawrence Smith's method for alkalies,333,412Lead,211colorimetric assay for,218detection of,211dry assay for,211gravimetric determination of,213in commercial copper,206in commercial zinc,214in galena,217,218separation of,211,213volumetric determination of,214Litharge, use of, in dry assays,20,93Lithium,338Lime,320milk of,321volumetric assays for,322Limestone, examination of,329lime in,324Limewater,321Loths,9Magnesia, magnesium,328mixture, preparation of,64Manganese,298colorimetric assay,306detection of,299gravimetric determination of,300separation of,299volumetric determination of,300Manganese peroxide, ferrous sulphate assay for,301iodine assay for,302= manganese dioxide,298Manganese ore, copper in,204manganese in,300peroxide in,302Matte,18Measuring,49flasks,49gases,44,52gold buttons,133,440,liquids,49silver buttons,106Mechanical methods,16Mercury,171dry assay,172wet assay,173Metallic particles in ores, gold,129particles in ores, silver,108particles, tin,278,287Micrometer,133Microscope, measuring with the,440,133Mispickel, arsenic in,125,392sulphur in,376Moisture,7,350Molybdate separation for phosphates,395solution, preparation of,60Molybdenum,311Muffle,25Nessler's solution,342Nickel,251dry assay for,251electrolytic assay,254gravimetric determination of,254in German silver,255,259separation from cobalt,254,258,442separation from iron,258separation from manganese,258separation of,253volumetric assay,255Niobium,297Nitre,22use of, in dry assays,95Nitrogen and nitrates,400Nitrometer,403Normal acid, normal solutions,323Ores, determining water in,5,351drying,5powdering,4,109,130,448quantities of, for an assay,11,27,127sampling,1,127,444with metallic particles,3,108,129Osmiridium,171Osmium,171Ounces to the ton, long,107to the ton, short,132Oxidation,345Oxides,345determination of oxygen in,346Oxidising agents,22,95,345effect of nitre,95effect of nitric acid,56Oxygen,344equivalent,358in natural waters,344,356in ores,348Palladium,171Parting,150acids,150in flasks,151in glazed crucibles,153in special apparatus,156in test tubes,152Phosphate, assay of apatite for,399assay of iron ore for,399Phosphates, gravimetric assay,396volumetric assay,397Phosphorus and phosphates,394in iron,399Pipette,50,120Platinum,170