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Updated: May 2, 2025
For instance, "mullocky" lode stuff, containing much clayey matter or material carrying a large percentage of heavy metal, such as titanic iron or metallic sulphides, will need a larger quantity of water per stamp than clean quartz. A fair average quantity would be 750 to 1000 gallons per hour for each box of five stamps.
The whole dissolves; the excess of acid is driven off by evaporation at a boiling heat, and the residue, diluted with water, is saturated with hydrogen sulphide. The iron remains in solution, while the mixed lead and tin sulphides precipitated are allowed to digest for a long time in an alkaline sulphide.
Ferrous sulphide was next similarly treated, and gave, after the lapse of a few hours, a copious blackish precipitation of sulphur, and possessing properties similar to the sulphur obtained by dissolving sulphides such as cupric sulphide in dilute nitric acid, in all other respects resembling common sulphur.
He told how the "tailings" at Mukton City had panned out 30 per cent, to the ton with two hundred thousand tons in the dump thrown away until the new smelter was started and they could get rid of the sulphides; of what Aetna Cobb's Crest had done and Beals Hollow and Morgan Creek all on the same ridge, and was about launching out on the future value of Mukton Lode when Mason broke the silence by asking if any one present had heard of a mine somewhere in Nevada which an Englishman had bought and which had panned out $1,200 to the ton the first week and not a cent to the square mile ever afterward?
About this age, probably, when really dry land began to appear, came the first formation of mineral lodes, and the waters, heavily charged with silicates, carbonates of lime, sulphides, etc., in solution, commenced to deposit their contents in solid form when the heat and pressure were removed.
The ore of this district is almost wholly composed of blackish silver sulphides. Mr. Frederick A. Ober, who has written much and well upon Mexico and her resources, tells us that the sum total coined by all the mints in the country, so far as known, was, up to 1884, over three billions of dollars, while the present annual product is greater than the amount furnished by all the mines of Europe.
On the whole, I rather favour the use of mercury in the box at any time, unless the ore is very refractory that is, contains too great a proportion of base metals, particularly sulphides of iron, arsenic, etc., when the result will not be satisfactory, but may entail great loss by the escape of floured mercury carrying with it particles of gold.
The attributing of this property of generating voltaic currents, hitherto supposed to be almost peculiar to metals, to such sulphides as are commonly found in metalliferous veins, further led Mr. Skey to speculate how far the currents discovered to exist in such veins by Mr.
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