Zac Efron will star in ‘Gold’.The 33-year-old actor has been lined up to take a major role in the upcoming survival thriller flick, which is set to be directed by Anthony Hayes, and will be introduced to buyers at the upcoming American Film Market.Altitude Film Sales and CAA Media Finance will co-represent domestic sales on the film, and production is expected to begin in Australia – where Efron currently lives – later this month.Hayes will also star in the film alongside Efron, and the production tells the story of two strangers who together find a giant gold nugget while traveling through th…