Sentence Examples

  • There are several public assay offices in Italy for silk; the first in the world was established in Turin in 1750.
  • In 1859 the mines were worked only for their gold; the ignorant miners threw away the " black stuff " which was really valuable silver ore with an assay value four times as great as that of their ores of gold; and when this was discovered there came a period of unprecedented silver production.
  • The metals he produced are said to have proved genuine on assay; when, however, in the following year he was challenged to repeat the experiments he was unable to do so and committed suicide.
  • Per ton) is desilverized (see below); the matte (Pb =8-12%, Cu =3-4%, Ag = 3-10f the assay-value of the base bullion, rest Fe and S) is roasted and resmelted, when part of the argentiferous lead is recovered as base bullion, while the rest remains with the copper, which becomes concentrated in a copper-matte (60% copper) to be worked up by separate processes.
  • A third addition becomes necessary to remove the rest of the silver, when the lead will assay only o I oz.

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