Thanks for the link Shimmer, I noticed they didn't have our 4 pure Silver plays listed: CCU, SVL, AYN & ARD so emailed them the details.
While I'm sure there are some great Silver plays on other exchanges I would prefer to stick to investing where I feel comfortable (on the ASX). I am getting familiar with most of the rules they have to stick by, etc, I imagine it would be quite a steep learning curve learning every countries exchange and corporate rules to know what sort of laws they are expected to stick to on other exchanges.
Further to this I think the limited number available on the ASX actually puts ours in a better position to provide better returns than you may see for companies on some other exchanges.