The second comprises the mines situated west of the city of Durango as well as those in Sinaloa, for the labors of engineers have brought them so close to each other by their works that they may be united in the same geological division.
The third group is the northernmost in Mexico, and is that which embraces the mines of Chihuahua and Cosiguiriachi. It extends from the 27th° to the 29th° of north latitude.
The fourth and fifth clusters are found north-east of Mexico, and are formed by the mines of Real del Monte or Pachuca, and Zimapan, or, El Doctor.
Bolaños, in Guadalajara, and Tasco in Oajaca, are the central points of the sixth, seventh and eighth.2
The reader who will cast his eye over the map of Mexico, will at once perceive that the geographical space covered by this metalliferous region, is small when compared with the great extent of the whole country. The eight groups into which the mining districts are divided occupy a space of twelve thousand square leagues, or one tenth only of the whole extent of the Mexican republic as it existed previous to the treaty of 1848 and before the mineral wealth of California and probably of New Mexico was known to the world. But as that treaty confirmed and ceded to the United States more than one half of the ancient territory of Mexico, we may estimate the mining region as covering fully one fifth of the remainder.
Before the discovery and conquest of the West Indies and the American continent, Europe had looked to the east for her chief supplies of treasure. America was discovered by Columbus, not as was so long imagined, because he foresaw the existence of another continent, but because he sought a shorter route to the rich and golden Zipangou, and to the spice regions of eastern Asia. Columbus and Vespuccius both died