Four companies have been established for prosecuting the labor of the mines, Presena, Rosario, Tajo, and Prieta. The first takes its name from Senor Delille, the second is composed of Mexicans, and the last two are composed of Mexicans, English, and naturalized Spaniards. Nothing is known in relation to their capitals. Besides the precious metals, we find lead in Naica and Babisas, of the canton of Matamoros; copper, from which only _magistral_ is taken, is found in the canton of Mina, and sulphur and saltpetre in the canton of Iturbide. The reports mention nothing in respect to the authorities that take cognizance of the affairs of the Mineria; but it is presumed that, as in the rest of the nation, the judges of first instance take knowledge of controversies, and the courts of mines, if by chance they are established, take cognizance of the economy and government of the mines. The mint of Guadalupe and Calvo coined in 1848, $720,765, and in 1849, $665,225, of which two sums $1,027,130 were of silver, and $355,859 in gold, the whole being the proceeds of 116,015 marks, 1 oz., and 4 eighths of silver, of the ley of eleven _dineros_, and of 2351 marks, 5 oz., 2 eighths of gold, with ley of twenty-two carats. This appears from the reports of the mint of the capital of that state. C. REPORT ON THE MINERAL RICHES OF COAHUILA. This state, one of the least populous, and exposed, like all the frontier states of the north, to the incessant incursions of the barbarous tribes, offers at present very little interest to those speculations which engender the 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.