Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. I have been prompted to this account of the mine ral resources of Mexico, by having been, for ten years, the daily witness of facts proving the great wealth hidden in the recesses of the Sierra Madre, and lying at the bottom of the rivers emptying into the gulf of California. Jealous to secure to my countrymen a more intimate knowledge of a country toward which English capitalists have already begun to direct their thoughts and endeavors, I resolved to give them the description, imperfect as it is, which my pretty thor ough knowledge of Northern Mexico enables me to communicate.