However, one factor that gold has on its side is that, unlike other non-renewable resources such as oil, it can be recycled. So we'll never run out of gold, even when we can't extract it anymore. Since the planet has a finite supply of gold, it is conceivable that natural resources will run out. According to estimates from the United States Geological Survey, there are only about 52,000 tons of extractable gold still left on the ground.
However, global gold mining adds between 2500 and 3000 tons to the total stock of gold on the ground each year. Based on those estimates, there may be only about 17 more years of underground gold left to extract.