Zac Efron is set to star in the survival thriller Gold, which will find him trying to escape the unforgiving elements of the Australian Outback. The indie film follows two strangers who stumble across the biggest gold nugget ever found while traveling through the desert. They formulate a plan to protect and excavate their bounty, but that means one man will have to stay while the other leaves to go get the necessary equipment. Efron will play the man who stays behind and must endure harsh desert elements, ravenous wild dogs and mysterious intruders, all while battling the sinking suspicion …