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Showing It is probable, however, that the output for the current year will show a considerable increase over that of Fine ounces. At the present time there are about The number of shafts 1, feet or more in depth is about 22; of these the Lillie is the deepest, having attained 1, feet.
The motive power for hoisting is ordinarily steam, electric power being used only in smaller shafts. The mining methods employed present few features of particular interest.
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The width stoped ranges from 3 to 50 feet or more. The stopes are sometimes filled, but are of ten left open after the broken rock between levels has been drawn off. Operations are facilitated by the great hardness of the rock, stopes feet or more in. The ores are not adapted to concentrating by ordinary means.
Hand sorting and washing-, the latter in order to separate the fines, are the methods employed. More care is now taken than formerly, but at many places there is still room for improvement. The Portland mine has for some time been the heaviest producer in tonnage as well as in value. Its output is from 60, to 90, tons per annum. The metallurgical history of the camp is interesting.
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Beginning with local amalgamating mills, the. It was soon found, however, that better situations would be found in the valleys, and at present a very large part of the tonnage is shipped to chlorination and cyanide works at Colorado City and Florence. A still smaller amount is treated in a local chlorination plant near Victor.
While in former years the practice leaned more toward the cyanide process, the bulk of the ore is now treated in large chlorination mills with automatic roasters and revolving barrels. It has always been found necessary to roast all except the completely oxidized ores.
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The extent of these low-grade ores is not yet fully demonstrated. Regarding the value.