I’d be surprised beyond my ability to adequately express it here to find that you have any silver American coins in change that you’ve accumulated over the past 20 years. But assuming that you might have, say, a half-dozen coins of that type, and assuming that those dimes, quarters and half-dollars are worth, oh, 100 times the face value of the coin (they’re not worth that much more; I’m just making a point), would it be worth your time and aggravation to sort through 80# of coinage for a return that could maybe at the outside return an additional $25 – $50 or so over the face value of the coins already there?
And does spending your time in that way appeal to you?
If so, then have at it, and good luck to you.
On the other hand, it is always possible that you could have some coins of real rarity and value – but probably not for the metal content. That is, you could have a double-struck coin that got by the Mint inspectors and into circulation. Those are rare and valuable because of the rarity. Or alternatively, a coin of a particular vintage from a particular mint – and in very good to excellent condition – which may command a premium.
But in those cases, unless you already know what you’re looking for and have a good eye as to the coin’s grade, you’d either miss it or mis-value it – or simply not be able to command its true value in a trade with a professional coin dealer anyway, because of your lack of knowledge and experience – so you’d be spending a lot of time for a very speculative and uncertain return.
My recommendation would be to sell the bucket by weight to a coin dealer or collector who does have those interests, and spare yourself the aggravation (and added expense) of hand-sorting, counting or rolling the coins. Or give the whole mess to a young person who has those interests.