ALL coins ever issued by the U.S. Mint are legal tender, even those coined in 1791.
Yes, ALL silver and gold coins are still legal tender, and will still be accepted by the U.S. government in payment of debt and taxes.
Now, no fool would try to pay with such money when fiat currency is so readily available, because the government will only accept silver and gold coins for face value. Since fiat currency has caused inflated values for taxes and debts, it would be foolish to try to pay face value silver or gold in an attempt to pay those taxes and debts - you would never get actual value for them.
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