No doubt that Native Americans in Mexico and South America had found gold, and there is buildings and objects that were made out of gold in the Incan and Aztec Empires. Francisco Pizzaro was reportedly shocked to find how much gold the Inca could field to pay ransom for their king, when he found rooms filled with gold and silver. Aztec jewelry was made out of gold. Pocahontas is from a tribe of Indians from Virginia, which no one has ever found gold in. No one has ever found gold in any state in the Eastern North America in huge amounts like that. So more than likely, most of the Eastern American tribes had realistically never seen gold. (http://www.grandviewgold.com/Gold_Properties/?ph=Properties%20Overview)

The website shows a map of all the places gold has been found in North and South America. So only American tribes that lived in those areas would've most likely known what gold is, and even then, in some of those areas it was very rare to find. Nearby tribes in the midwestern part of America may have been able to get gold from trade with western Indian tribes, but no European colonists in New England and the rest of the 13 colonies had ever reported any large amounts of gold found from the Natives.