What is the value of an 1829 US silver dollar?

The US didn't make any circulating silver dollars from 1804 to 1835 inclusive.

If your coin is small, gold in color, and has a picture of Andrew Jackson on it, it's a modern $1 coin and it's made of brass, not silver (that's why it's brass-colored and not silver-colored, after all!) 1829 was when Jackson was inaugurated.