My coin dealer friend advised me recently that the run of the mill, circulated Franklins at this time are worth more for their silver content than their numismatic value.
When silver is low, say 3.5 times face, then the Franklins carry a small premium, say 4 or 4.5 to one, but right now with melt is around 10 times face, give or take, they are worth more for their silver content.
He was dealing coins during the big "Silver Craze" in the late 1970's and 1980 when the Hunt Brothers tried to corner the market on silver. He tells me that for the most part the silver coins were not melted down, but have been held by investers and large companies like Dillon Gage in Dallas.
http://www.dillongage.com/
It seems that there is a large business of selling, buying and trading silver in the form of $1000.00 face bags to the tune of 10's of bags, if not hundreds of bags or more at a time. No reason to melt the coins since they are in a good form of trade or exchange as they are. Everyone knows the silver content of any american coin and its value at any given time. No need to speculate.
What did get melted away was all the old silverware, jewlery, etc., etc.. Only the finer pieces with much more value than that of their silver survived.
If you want to read an interesting story about the Hunt family read this one.
http://www.gold-eagle.com/editorials_04/laborde012704.html
CLZinTX