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The ore in the gossan is very generally more valuable than it will be below, and this is especially true of gold and silver ores. The gold having been set free from the close embrace in which the iron pyrite held it previous to the latter's oxidation, it is now readily caught by quicksilver. Silver under similar conditionses chloride, and
A key factor that affects the energy and water requirements of copper extraction is the ore grade that is, the ratio of contained copper per unit ofmonly expressed as a percentage, e.g. Cu. It is expected that ore grades will steadily decline as high grade ores are preferentially mined Mudd, 2010 Mudd and Weng, in press. The
Gold A test known as Darton's is believed to be a valuable means of detecting minute quantities of gold in rocks, ore tailings, etc. "Small parts are chipped from all the sides of a mass of rock, amounting in all to aboutounce. This is powdered in a steel mortar and well mixed. About half is placed in a capacious test tube, and then the tube is partly filled with a solution made by