The Treasure of Pearls by Gustave Aimard

Don Benito Vazquez de Bustamente was the son of that General Bustamente, twice president of the Mexican Republic. When his father, cast down from power, was forced to flee with his family to take final refuge at Guayaquil, the boy was only five or six years old. Suffering with fever, which made the voyage dangerous for him, the child was left at Guaymas in charge of a faithful adherent, who found no better way of saving the son of the proscript from persecution than to take him as one of his own little family up the San Jose Valley, where he had a ranch. The boy remained there and grew up to the age when we encountered him.

His rough but trusty guardian let the youth run wild, teaching him to ride and shoot as the only needful accomplishments. Benito, falling into the company of the remnant of purer-blooded Indians, supposed to be the last of the original possessors of that region, relished their vagabond life exceedingly. Not only did he spend weeks at a time in hunts with them, with an occasional running fight with the Yaqui tribe, and even the Apaches raiding Sonora; but, at the season for pearl diving, accompanied them in their boats, not only in the Gulf, but down the mainland and up the seacoast of the peninsula. La Paz he knew well, and the Isles of Pearls were familiar in every cranny.