>How much does a million in dimes weigh?
A thousand dollar bag of clad coins weighs 50 pounds, so a million in dimes, quarters, or halves would weigh 50K pounds
>What does one do with them?
In the case of dimes, it would probably pay to run them through a machine that works like a coinstar and kicks out the silver.
Then dump it at banks with free coin counting.
If you could average 4 silvers per thousand dollar bag, you'd wind up with 4000 silver dimes worth $7500 melt value.