Transactions of the Institution of Mining & Metallurgy, Volume 22

acid amalgam amount antimony average black tin blast furnace bullion calculated Californian stamps carried cassiterite centring charge chemical assay clean coarse concentrate cones copper Cornish Cornwall cost crushing cupel cyanide diam discharge dressing Edward Hooper engineer error experience extraction eye-piece feed figures flotation flotation process furnace gold grade gravity Homestake Institution instrument iodine iron launder lead litharge loss machine material mesh metallic tin Metallurgy method mill mineral mining obtained operation overflow pans paper percentage pipe plates plumb-bob practice precipitate pulp pyrites Rand re-grinding recovery residues rhodonite sample sand screens screw shaft silver slag slime plant sluicing solution specific gravity speiss stamps sulphide sump surface surveying surveyor tailings tank telescope theodolite titration tonnage tons treated treatment tripod tube-mill underground vanners vanning assay vernier vertical weak solution weight wet assay zinc zinc dust