"Plata" is Joaquín's mare and his faithful companion during his trips.
Role in the film
Plata is seen for first time when Joaquin leaves of San Ángel (riding on her) to fight the bandits in other towns and cities.
During the film, each time Joaquín makes a dramatic entry he appears riding Plata; like when the bandits appeared to loot the town, and at the beginning of the invasion of Chakal.
- Joaquín got her as a gift from his father as a graduation present from the academy.
- Her father was Plomo; the horse of Captain Mondragon. 
- Plata literally means "Silver" in Spanish.