The show is typically considered to take place from approximately 1870-1876. The season five episodes "Full Circle" and "Blind Circle" clearly state they take place in 1875. That would place this episode somewhere prior to 1875, most likely in 1873. This leads to an error, since Pancho Villa is presented here as a teenager, but in fact was not born until 1878.
Ortega's man: Why would you dig a stranger out of an anthill? What was he to you?
Paladin: He was a boy in pain. I might be moved to dig you out of an anthill if I hadn't already met you.
(Soledad has sashayed back to the house)
Don Ortega: What are you thinking?
Paladin: That to her, that girl, all our adult problems are merely a romantic adventure.
Soledad: Oh, you ice-cold Norteamericanos. You have no feeling for beauty. Tenderness. For love. All you think about is the gold my father paid you.
Paladin (whispering): Don't talk so loudly. I don't want to lose the gold.
Soledad: You care more about the gold than you do for me.
Paladin: The gold belongs to me and you do not.
Soledad: Conditions can change, ah?
Paladin: Certainly; I may lose the gold.