In Colombia, mining engineer Rian Mitchell discovers Carrero, the lost emerald mine of the Conquistadors, but has to contend with notorious local bandit El Moro's gang and with coffee planter Catherine Knowland's love.
| Actor | Role |
|---|---|
 Stewart GrangerRian X. Mitchell | Rian X. Mitchell |
 Grace KellyCatherine Knowland | Catherine Knowland |
 Paul DouglasVic Leonard | Vic Leonard |
 John EricsonDonald Knowland | Donald Knowland |
 Murvyn VyeEl Moro | El Moro |
 José TorvayManuel | Manuel |
 Robert TafurFather Ripero | Father Ripero |
 CharlitaDolores | Dolores |
| JJoe DominguezJose | Jose |
 Nacho GalindoOfficer Perez | Officer Perez |
 Natividad VacíoHernandez | Hernandez |
 Rico AlanizAntonio | Antonio |
 Paul MarionRoberto | Roberto |
 Martín GarralagaNot listed | Not listed |
 Rodolfo Hoyos Jr.Not listed | Not listed |
 Lillian MolieriNot listed | Not listed |
 Alberto MorinNot listed | Not listed |
 Charles StevensNot listed | Not listed |