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    atio process is employed here as well as elsewhere, and hundreds of horses and mules are annually worn out in treading the ores. An American named Parkman made an improvement on this system by rolling

    at any rate, we g
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    a loaded barrel over and through the mixture by means of horses or mules walking in a circle, as in an old-fashioned cider-mill. The barrel mingles the ore and the chemicals as well as the horses' fe

    ive it the prefere
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    et could do it, and the injury to the hoofs of the animals is prevented, as they do not come in contact with the mass. Sometimes heavy wheels are used instead of the barrels, and they are arranged on

    nce." OPENING A
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环球彩票系统后台

ilver from t    he ore, which

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a graduated scale, so that they move slowly from centre to circumference of the torta, or pulp heap, as they revolve, and from circumference back to the centre again. In this way t

he entire surface is gone over; the reduction [Pg 114] of the mass takes from twenty to thirty days, and is thoroughly done. ENTRANCE OF A MINE NOT IN OPERATION.

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  • has been descr
  • ibed on previous
  • pages. There are
  • about fifty reductio
  • n-mills at Guanaju
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all of which have their advocates, who prefer them to the
others. The p