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ocess has long been in use in South America, and is now employed in Mexico, and now or lately in Nevada.
It was invented by Medina in 1557.
The materials necessary for the reduction of silver by thiury.
The metallic result is then refined.
The barrel process at the Ophir and other mines in Nevada is preceded by drying the ores in a kiln; dry stamping, screening through wire sieves, and roastspects similar to those described under the patio process and the barrel process of Freiburg and Nevada.
The energy of the treatment, however, has the effect of expediting the decomposition of the maund to proceed more rapidly.
amalgamation of roasted ores. In some of the mining districts of Nevada, and particularly in the neighborhood of Austin, where the ores consist of various compound sulps, the cost of working from $45 to $50 ores by the pan process is, in those portions of the State of Nevada in which water-power can be obtained, nearly as follows: —
Stamping wet, throu