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Silver drawn from the mines of Mexico from
1690 to 1800.
Total in silver alone, from 1690 to 1800 149,350,721 marcs*.!
* 98,008,212 lb. Troy. Trans.
It appears from these tables that the mines of New Spain have produced from 1690 to 1800, the enormous sum of 149,350,721 marcs of silver* ; and from 1690 to 1803, gold and silver to the value of 1,353,452,020 double piastrest, or 7,105,623,105 livres tournois, estimating the piastres at 105 sous, French money.
For a hundred and thirteen years, the produce of the mines has been constantly on the increase, if we except the single period from 1760 to 1767. This increase becomes mani, fest, when we compare every ten years, the quantity of the precious metals given in to the mint of Mexico, as is done in the following tables, of which the one indicates the value of the gold and silver in Piastres, and the other, the quantity of silver in marss,
*98,008,2121b. troy, Trans.
Progress of the mining operations of Mexico.
Table I.. Gold and Silver.
From 1690 to 1699 43,871,335
1700 1709 51,731,034
1790 1799 231,080,214 Total from 1690 to 1799—1,276,232,840 Table II. Silver alone.s e
Marce. | Oz. Oc.
From 1690 to 1699 5,173,099
1700 1709 16,109,781
Total from 1690 to 147,252,008 1799
When we distinguish those periods in which the progress of mining has been most rapid, we find the following results :
This table along with the preceding one, proves that the periods during which the wealth of the mines have most increased, are from 1736 to 1745, from 1777 to 17833, and from 1788 to 1798; but the increase in general has been so little in proportion to the space of time, that the total produce of the mines was : 4 millions of Piastres in 1695
1795 from whence it follows that the produce has
been tripled in fifty-two years, and sextupled in a hundred years.
After the gold and silver, it remains for us to speak of the other metals, called common metals, the working of which, as we have already stated in the beginning of this chapter, has been very much neglected. Copper is found in a native state, and under the forms of vitreous and oxidulated copper, in the mines of Ingaran, a little to the south of the Volcan de Jorullo, at San Juan Guetamo, in the intendancy of Valladolid, and in the province of New Mexico. The Mexican tin is extracted by means of washing, from the alluvious lands of the intendancy of Guanaxuato, near Gigante, San Felipe, Robledal and San Miguel el Grande as well as in the intendancy of Zacatecas between the towns of Xeres and Villa Nueva. One of the tin mines most common in Mexico is the wood 'tin of the English mineralogists. It appears that this mineral is originally found in veins which traverse trap-porphyries; but the natives, instead of working these veins, prefer the extracting of tin from the earth brought down the ravins. The intendancy of Guanaxuato in 1802, produced nearly 9200 arrobas of copper, and 400 of tin.
The iron mines are more abundant than is generally believed, in the intendancies of Valladolid, Zacatecas, and Guadalaxara, and