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In all, twenty-three dollars and two reals; while the value of the ores contained in the Monton, taking them at an average of six marcs, (some are much richer, and few, or none, poorer,) is forty-eight dollars; which leaves a clear profit of twenty-four dollars and six reals upon each monton.

There are few districts in which the use of Arrastres, in lieu of stampers, is so general as at Angangeo.

They are more economical in some respects than Morteros, (stampers,) as they require much less attendance; but they also do less work: for an arrastre cannot bray more than three montones of ore in the week; while a twelve stamp Mortero will pulverize the same quantity in twenty-four hours. They have, however, the advantage of reducing the ore at once to a fine impalpable power, free from all gritty substances, and perfectly ready to be