You could try contacting Imperial Smelting and Refining in Markham
near Toronto. Here is their web site
They are really nice people to deal with. I’ve been buying my Wire
from them for a couple of years now and have had nothing but the best
service. I’ve not had anything sent to be refined as I only have the
smallest of scraps that I am saving to see if I can melt them down to
make a sheet of siver. Imperial also has an office on Vancouver and
one in Rhode Island.