The table below gives the average production of zinc, argentiferous lead, iron-pyrites and other ores during the quinquennial period 1901f 905.
Iodide and chloro-bromide of silver, and argentiferous Silver lead ores, the largest deposits of the metal being found in the last-mentioned form.
The leading products of the blast-furnace are argentiferous lead (base bullion), matte, slag and flue-dust (fine particles of charge and volatilized metal carried out of the furnace by the ascending gas current).
Formerly all argentiferous lead had to be cupelled, and the resulting litharge then reduced to metallic lead.
In the beginning of the operation enough argentiferous lead is charged to fill the cavity of the test.
At the same time small bars of argentiferous lead, inserted at the back, are slowly pushed forward, so that in melting down they may replace the oxidized lead.
In the Pattinson process the argentiferous lead is melted down in the central cast iron kettle of a series 8-15, placed one next to the other, each having a capacity of 9-15 tons and a separate fire-place.
Eissler, The Metallurgy of Argentiferous Silver.
Silver is generally found as red oxides (locally called rosicler), sulphides and argentiferous galena.
In,the vicinity of some of the deposits of argentiferous galena are large coal beds, but timber is scarce on the table-lands.
There are mines of chrome, mercury, cinnabar, argentiferous lead and rock salt.
Lead ores (chiefly argentiferous galena) and building stone are found, and iron ore is distributed over the hilly country.
Silver was raised in the 12th century, and argentiferous lead is still the most valuable ore mined; tin, iron and cobalt rank next, and coal is one of the chief exports.
The mineral nearly always contains a small amount of silver, and sometimes antimony, arsenic, copper, gold, selenium, &c. Argentiferous galena is an important source of silver; this metal is present in amounts rarely exceeding %, and often less than o 03% (equivalent to 104 ounces per ton).
The mines of argentiferous lead, belonging to Greenwich Hospital, London, were formerly of great value, and it was in order that royalties on the Alston lead mines and on those elsewhere in the county might be jointly collected that the parish was first included within the borders of Cumberland, in the 18th century.
According to the bureau of the census the value in 1902 of the lead yielded by copper, by non-argentiferous lead and zinc, and by gold and silver ores respectively was $19,053, $5,850,721 and $12,311,239.
This reflects the revolutionary change in the history of lead mining since the first discovery of argentiferous lead ores in the Rocky Mountain states in 1864, which became available only after the building of railways.
The value of products in 1902 were reported as $340,686 from gold and silver ores, and $8,665,675 from non-argentiferous lead and zinc ores.
In the neighbourhood are mines of argentiferous copper, and the surrounding district and villages are occupied with smelting and similar works.
In Lake county, for example, very much of the argentiferous ore that is too low for remunerative extraction (limit 1903 about $12.00 per ton) is used for fluxes.'
It is not used in the treatment of ores, but finds application in the case of calcined argentiferous lead and copper mattes.
Argentiferous galena occurs at Sala in limestone, surrounded by granulite, and at Guldsmedshytta (province of Orebro) in dark halleflinta.
A., 1884, p. 93); several copper mines in Khorasan, Samnan, Azerbaijan and Kerman; some of lead, two considerably argentiferous, in Khorasan, Tudarvar (near Samnan), Anguran, Afshar (both west of Zenjan), and Kerman; two of iron at Mesula in Gilan and Nur in Mazandaran; two of orpiment in Afshar and near Urmia; one of cobalt at Kamsar (near Kashan); one of alum in Tarom (near Kazvin); and a number of coal in the Lar district, north-east of Teheran, and at Hiv and Abyek, north-west of Teheran.
Other pairs of isomorphous argentiferous minerals are: the cubic polybasite, 9Ag2S Sb2S3, and pearceite, 9Ag2S As2S3; and the germanium minerals argyrodite, 4Ag 2 S GeS2, and canfieldite, 4Ag 2 S (Sn, Ge) S2.
Metalliferous products containing silver arise in many operations; the chief products which may yield silver economically are copper and lead mattes, burnt argentiferous pyrites and certain drosses and scums. Argentiferous ores consist of silver-bearing base-metal minerals and gangue.
Often it is more profitable to smelt real silver ores with argentiferous ores than to mill them, the greater cost being more than balanced by the increased yield.
The most important mineral is a peculiarly rich argentiferous lead, but gold in small quantities, copper, iron, sulphur, alum and arsenic are also found.