Silver rounds are .999 to .9995 pure, Actual us silver coins are 90% silver. 
Only the silver maple leaf is .9999, and silver bars and rounds .999 to .9998


________________________________
 From: "[email protected]" <[email protected]>
To: [email protected] 
Sent: Saturday, October 20, 2012 8:03 PM
Subject: Re: CS>Wires// Canadian silver dollars
 

In a message dated 10/20/2012 12:36:44 P.M. Eastern Daylight Time, 
[email protected] writes:
You can  use silver wire or coins(as long as at least .999 
pure)
>
I believe they said to put a small hole in the coin 
& suspend it into the DW with a bit of silver wire.  The silver dollars 
are four nines pure not 3.. Lois