exercise of mineral industry—that which, besides experience and capital, requires for its development an abundance of hands and entire security. While the publication of the mineral statistics of the nation not only brings the idea of manifesting the present condition of this branch of industry among us, but also that of propagating its exercise as one of the principal elements of riches among the Mexicans, it is necessary to speak of the state in which the Mineria is in Coahuila, and of hopes which it makes to spring up for the future. There are twelve mines actually amparadas, or in labor, in the four minerals already mentioned: their names are unknown to us, and it is only known that their monthly products amount to 200 marks [of 8 ounces] of silver and 150 loads of greta [litharge]. The number of operatives employed in all these amount to 193, and the day laborers receive four reals [half a dollar] a day.
There is no exact notice of the number of mineral districts and single mines abandoned in the State of Coahuila; but the number is considerable, according to the information furnished from 1843 by the deputation of Santa Rosa. Among those deserving a particular mention is that of the Sierra de Timulco and that of Potrerillos, by the good ley of the metals of the mines of the first, and by the uniformity of the veins and not unappreciable richness of the second. These veins run generally from northwest to southeast, and in the course they encounter, scattered about, silver-bearing galena [sulphuret of lead], lead, copper, with sulphuret of zinc. The amount of the consumptions of the mines that are worked is also unknown; but it is known that the gunpowder costs the operators $9 an aroba [of 25 pounds], of lead, $12 a carga of 300 pounds;