I bought into Silvermex early this year because of the huge amount of metal they are sitting on, the low # of outstanding shares and options, and the possibility of being an acqusition target while working toward production.
I give the management credit for their approach and ability to aquire great properties. But the amount of in ground resources in a historically great area make it a highly probably target for senior producer buyout.
Here is a pretty good little video on silver by David Morgan
http://www.youtube.com/watch?v=EgIbj4SP2Ec