The Mercury dime had 2.5 grams of mass, of which 90% was silver.
So, on the Earth, it would take 202 of them ($20.20 face value) to yield 1 pound of silver.
At the time of this writing (July 21, 2013), the most recent NY closing spot bid for
silver was $19.375 an ounce, so I'd imagine that anyone who had any mercury
dimes laying around either melted them or sold them a long time ago.
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they made 2 million 1916 d dimes oh and that dime is called a mercury dime ONLY 264,000 1916-D Mercury Dimes were struck.
One pound of silver = 14.583 troy ounces
Presuming that you are referring to US dimes issued between 1875 and 1964 (dimes older than 1875 had different weights and/or fineness), dimes weigh 2.50 grams and are 90% silver (the remaining 10% is copper). This means that the ASW (Actual Silver Weight) is 0.07234 troy ounces. Thus, it would require 14 dimes (this number is rounded up; the precise number is 13.8236 dimes) to have one troy ounce of silver.
ten dimes make 1.00 so you need 10,000 dimes
There are ten dimes in a dollar.