That’s not a ton of information, but I’ll hazard a guess.
We’re talking about an “uncirculated” liberty silver dollar that’s been gold-plated, right? (I say this based on the fact that the spot price of silver is about $12 an ounce last time I looked, and the spot price of gold is OMG higher.)
I can only guarantee its worth at the spot silver price, and that’s what a pawn shop would give you. The gold plating isn’t enough to add bullion value.
If you were to have the coin graded for perfection by one of the major coin grading companies, and provided it came out as a 68 or higher (scale of one to 70), you might be able to sell it at a small profit to another coin collector. Unfortunately you’ll also be out the cost of having the coin graded, which will more than kill your profit.
Your best bet is to wait until the spot price of silver goes back up. In 2011 it was $53 for a while.
Unfortunately most raw metals are a bad investment these days.
I wholeheartedly do not recommend buying gold-plated silver dollars from TV infomercials as an investment.