Anda muchacho, spara! (At the End of the Rainbow) (1971)

Roy runs away from the labor camp of Santa Lucia with Emiliano, a New Mexico rancher, both imprisoned unjustly for three powerful American bankers, to seize the gold mine that had Emiliano. During flight, the landowner dies and in his last moments asked Roy to recover the mine and save Jessica, daughter of his former foreman.