The Mighty Gorga (1969)

The hunt for a gigantic African gorilla provides the basis for this adventure-fantasy. A circus manager leads the expedition right into a native ambush. The explorers are captured and slated to become human sacrifices when the towering title primate shows up and destroys everything. Fortunately, the explorers escape and find safety in an enormous cave that proves to be filled with priceless jewels. If the travelers can escape Gorga's wrath, they might find themselves wealthy men.