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SILVER MINES.
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fectly safe, however, to add one-tenth to the production, as shown by the table, for this purpose, thereby increasing the total production for the calendar year 1890 to 1,309,174.04 marcs and for the first six months of 1891 to 810,119.72 marcs.
The following statement shows the quantity and grade of ore produced and how disposed of for the calendar year 1890:
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Estimating 1 kilogram at 4.3478 Bolivian marcs and the commercial value of silver at the average price for the calendar year 1890, as given in the annual report of the director of the United States mint, the commercial value of the silver produced in Bolivia for the calendar year 1890 was as follows:
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