How much is 1999 liberty dollar worth?

Answer 1

More information is needed.

ALL American coins have the word LIBERTY on them, and many have an image of Miss Liberty, so that's not in and of itself enough to ID a coin.

Assuming you have a piece that's about 40mm in diameter and says "One Oz .999 Silver" or similar on the back, it's a bullion piece sold for its metal content rather than for spending, and the $1 denomination is artificial. Silver is currently about $17/oz on the spot market.

If you have anything else, I'd suggest posting a new question with more details about the coin's size and design.