If you wish to sell silver coins how much you get for them will depend on several factors.
When you purchased them
If you bought your silver coins several years ago you can expect to get a good price for then since the value of silver has risen by over 100 percent over the past 6-7 years.
What type of coins you are selling
If you are selling Morgan Silver dollars, for example, you will get a better price than for Mexican or Canadian silver dollars or even the British silver sovereign as the silver Morgan is rarer and considered more valuable over and above the silver content. Also some dates are more rare than others.
The current price of silver
The current overall trend of silver is rising. The value of silver has continued to rise as the need for industry outweighs the production of silver. In fact silver is not being mined very much at all and new silver is being obtained as a by product of mining other minerals or metals.
Selling your silver coins
You can sell silver coins either through dealers or by auction. Each have their advantages and disadvantages.
Auctions, such as eBay, provide an avenue through which you can sell your coins but it is worth while browsing the auction first to see what people are buying. It is no good putting up silver coins for sale if no one is buying the type of coins you are selling. You also take a risk that you will get a good price provided the bidding is active and energetic.
Selling through an established dealer is somewhat safer but you will only get the current value less the dealers charge for mark up and you will pay for shipping. Checking the dealers terms of service also is a wise move.
You can sell silver coins rather easily provided you keep in mind the above and do your homework.