Hello there fellow exploiters heres another Spot for lots of Silver Ore to mine on the overflow Servers.
Its located on the Diessa Plateau
more describeley on a tower far up in the blasted moors
Theres a Elite Camping the Spot that is quite hard (lvl 19 or 20) since he puts on bleed status and heals himself but he is soloable atleast for me as a warrior.
Heres another Picture from on top of it http://www.abload.de/img/gw002omz9h.jpg
Edit: And before i forget theres some serious Walljumping required to get to the TOP of the tower, so dont discourage there and keep on trying.
And now have fun and happy farming.